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Nigelb63
04-02-2018, 04:23 AM
Nigel - Make 100% sure you're using the 'M' (Marzocchi) forks, or the spring kit will not fit.
Both sets are Marzocchi. So I’ve been looking at replacing the tubes with new ones from TNK but at £129 each , it’s cheaper to have the originals rechromed. I might even have a look at having them DLC coated.

freedomgli
04-02-2018, 08:52 AM
I might even have a look at having them DLC coated.
You're lucky living in UK as you have the entire F1 cottage industry at your doorstep. Specialists in the USA do exist, but they're few and far in between and generally don't do small jobs for small motorcycles. From a technical perspective, I'm not sure whether titanium nitride or DLC is preferred or whether one can even quantify a difference between the two in our application for conventional right-side-up forks on a RS50 other than the color.

mattology
04-02-2018, 09:59 AM
unless they’re rusted to hell i wouldn’t bother with any of it.

i wish i had more track time, that makes the largest improvement. i can’t wait to get back out on track again.

Nigelb63
04-02-2018, 01:22 PM
unless they’re rusted to hell i wouldn’t bother with any of it.

i wish i had more track time, that makes the largest improvement. i can’t wait to get back out on track again.
The one active Stanchion I need is rusted and needs a rechrome for sure. I’m just weighing up my options at the moment. The bike itself is being built for my son as it’s his first bike I’m keeping it at 50cc but just a bit lively.

I really like what youve done with your rs125 hybrid,Matt. As much as I love two strokes (I used to race TZ350’s in the 80’s) I’m seriously thinking about putting a KTM 250 4stroke engine in the RS next year.

mattology
04-02-2018, 01:25 PM
a 250 four stroke? or two stroke?

mattology
04-03-2018, 06:29 PM
sorry, i can't read!

don't put the diesel in it!!!!!!!!!!!!

mattology
04-12-2018, 05:53 AM
wideband o2 ????

why not!

mattology
04-30-2018, 01:49 PM
holy cow, i’m flying home today! haven’t been home since like march 3rd! i am supposed to be flying to peru later this week for work, possibly for the rest of the month, so i don’t think i will get major stuff done to my bikes, but we will see...

mattology
05-25-2018, 12:09 AM
havent posted in here in a while


slowly making progres on the 250s

https://i.imgur.com/OHiyJ4G.jpg?1

ransamuels
05-25-2018, 08:08 AM
Wow! I think you would have to be a nuclear power plant mechanic before you could wrench on that beauty.

mattology
05-25-2018, 10:00 AM
Wow! I think you would have to be a nuclear power plant mechanic before you could wrench on that beauty.

ahhahaha

not quite... although the 250 is pretty complicated compared to an rs50 or my converted 125s.

two cylinders, power valve servos and cables, solenoids on the carburetors, cable splitters, yadda yadda yadda...

mattology
05-26-2018, 10:30 AM
RSV4 rear shock on 250. changes will need to be made

https://i.imgur.com/QFWkxaR.jpg?1

mattology
06-05-2018, 09:56 AM
doing some gp controls with the 3d printer.... powervalve map 1/2 , ignition map 1/2

https://i.imgur.com/WVGzK7l.jpg?1

https://i.imgur.com/fAyeZOk.jpg?1

https://i.imgur.com/ptzEXVP.jpg?1

https://i.imgur.com/3PT4u9e.jpg?1

https://i.imgur.com/mBi6bW1.jpg?1

the hardware to tie it together should be here today. excited to give it a go

freedomgli
06-05-2018, 11:08 AM
I like your new signature Matt. Why the need for a 3d printer for the buttons? Just because? As there already are many suppliers of aftermarket handlebar controls for switching various electronics.

https://breeseracing.com/
https://apexracingdevelopment.com/
https://www.bikesportdevelopments.co.uk/SearchResults.asp?Cat=1962
https://www.mcr-motoparts.com/products/5-button-racing-switch
http://www.accossato.com/EN/motorcycles-accessories/button-panel.php
https://www.cncracing.com/world/search/?q=switch

mattology
06-05-2018, 04:11 PM
I like your new signature Matt. Why the need for a 3d printer for the buttons? Just because? As there already are many suppliers of aftermarket handlebar controls for switching various electronics.

https://breeseracing.com/
https://apexracingdevelopment.com/
https://www.bikesportdevelopments.co.uk/SearchResults.asp?Cat=1962
https://www.mcr-motoparts.com/products/5-button-racing-switch
http://www.accossato.com/EN/motorcycles-accessories/button-panel.php
https://www.cncracing.com/world/search/?q=switch

i have less than 50 bucks into both bikes...

mattology
06-10-2018, 10:26 AM
voltage regulator relocate

https://i.imgur.com/eLacsAB.jpg?1

stator rewire

https://i.imgur.com/T11bS4x.jpg?1

notice also the left side oil tank being repurposed as a coolant overflow tank to allow cold air intake on the right side of the bike per the factory duct

3d printed battery box including girlfriend hair-tie retention system

https://i.imgur.com/prtjnvE.jpg

https://i.imgur.com/AnQDzYv.jpg?1

https://i.imgur.com/X0soV8F.jpg?1

freedomgli
06-10-2018, 12:23 PM
That battery box is trick. Looks really lightweight.

ransamuels
06-10-2018, 02:36 PM
What holds the battery box to the screw clamps that go around the pads and the front fairing support?

mattology
06-10-2018, 03:37 PM
it's printed nylon

mattology
06-11-2018, 10:23 AM
making wiring progress

https://i.imgur.com/BuuQEi3.jpg?1

mattology
06-12-2018, 04:30 PM
full rewire pretty much complete

https://i.imgur.com/2DAXban.jpg?1

https://i.imgur.com/lYsAJP2.jpg?1

https://i.imgur.com/5ZPxecg.jpg?1

https://i.imgur.com/vY7dNGw.jpg?1

https://i.imgur.com/tJNd5lD.jpg?1

https://i.imgur.com/BuuQEi3.jpg?1

https://i.imgur.com/T11bS4x.jpg?1

freedomgli
06-12-2018, 04:58 PM
Top shelf man. It’s beautiful. Love all the attention to detail and professional motorsport quality loom, heat shrink and connectors.

mattology
06-13-2018, 10:46 AM
thanks, it could be better but i'm pretty happy with how it is coming along

chadzilla1
06-13-2018, 07:36 PM
love the carbon seat and tank. Looks like doing lot of work on the bike, which one was this one didnt you have 3 ? Hope to come to Tampa in next month or two.

mattology
06-13-2018, 10:06 PM
https://i.imgur.com/Hkutkmr.jpg?1

https://i.imgur.com/Q9mBDCx.jpg?1

https://i.imgur.com/EYNGpgC.jpg?1


the jollys dont fit that well but i'm still moving forward

mattology
06-14-2018, 10:15 PM
https://www.youtube.com/watch?v=gF2Q-70SkqA


holy cow, it's alive

twinturba
06-14-2018, 11:00 PM
Man I miss my 250’s! Awesome!

Nigelb63
06-15-2018, 04:58 PM
https://i.imgur.com/Hkutkmr.jpg?1

https://i.imgur.com/Q9mBDCx.jpg?1

https://i.imgur.com/EYNGpgC.jpg?1


the jollys dont fit that well but i'm still moving forward
German pointer if I’m not mistaken.

mattology
06-15-2018, 06:23 PM
https://i.imgur.com/r6GqHq7.jpg?2

https://i.imgur.com/UExVgSo.jpg?1

mattology
06-25-2018, 12:23 PM
update on the 125:

my custom cylinder head inserts should be here this week, possibly as early as tomorrow. so this combined with the solenoid powerjet and tps enabled carburetor should be the next level of confusion for the bike, hahaha

ToraTora
06-25-2018, 03:37 PM
It's totally looking awesome Matt!!

mattology
06-26-2018, 11:27 AM
thanks tora

look what showed up today:


https://i.imgur.com/GaagNza.jpg?1

mattology
06-26-2018, 11:54 PM
as found piston wash

https://i.imgur.com/6BeR2or.jpg?1

https://i.imgur.com/ukSBCpz.jpg?1

the custom insert fits beautifully at least from what i can tell

will set squish and give it a go tomorrow!

https://i.imgur.com/dW2Aexu.jpg?1

mattology
07-10-2018, 10:57 PM
the insert works. i' have been busy with the 250s, i took mine and my dads to the dyno and mine put 70 to the wheels down, but my dad's only did 55.

have to look at all that again and see what's going on with his bike. i think it's a combination of too rich and old plugs... but we will see.

i made a much better spreadsheet than what i had for ignition timings. i hope to dyno my 125 in the near future, but i think next week i have to work at a local power plant on a job for a couple of weeks, so it will probably be on hold. we will figure it out and go from there.

mattology
07-13-2018, 08:10 PM
i'm finally getting around to installing the wideband and the tps with solenoid power jet carburetor.. the carb is at my dad's, as he is machining the float bowl for press fit fuel fittings, and machining the bellmouth to accept the power jet. it should be back in time for me to be ready for it with a new intake printed with a flat for the power jet.

i also installed the wideband.

https://i.imgur.com/vLladqH.jpg

https://i.imgur.com/vOz0H6x.jpg

https://i.imgur.com/ihzR5cV.jpg

chadzilla1
07-14-2018, 01:44 PM
it amazing how much work you have done to RS50/125. I have to go to LA in two weeks for a month when I come back I'll be in Tampa for a week, real estate training. Love to stop and see all the updates

mattology
07-15-2018, 04:34 PM
beginnings of headlight delete on the front fairing:


https://i.imgur.com/1HLSrBS.jpg?2

https://i.imgur.com/yw7zGYY.jpg?1

ransamuels
07-16-2018, 06:22 PM
Matt: Please give us some info about the carbon fabric you are using and how are you molding it to the fairing. Is it PrePreg? If not, what epoxy are you using? Are you doing this with the fairing on the bike? What is the fabric weight? Are you "hard rolling" it before application?

mattology
07-17-2018, 09:47 AM
first off, i have no idea what i am doing.... i've never done this before...

i put the headlight in, and used foam to take up the space around the bezel so it would be smooth there.. then i ptfe taped over that so epoxy wouldn't bond directly to the headlight or the foam..

then i laid up carbon tape and painted on resin, getting it as nice as i could, and then i compressed it with ptfe tape.

then after it set up hard after about 2 hours i popped out the headlight ( the ptfe tape acts like a release layer) and i let it cure about 2 more hours before taking off the outer layer of ptfe tape..

this is the epoxy that i am using, it is a wicking resin:

http://cart.amwprox.com/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=1043&virtuemart_category_id=72

i am painting on the epoxy onto dry tape from fibre glast:

https://www.fibreglast.com/product/Carbon_Fiber_Tape_597/carbon-fiber-tapes-tow-and-sleeves

i am using ptfe tape to compress down the epoxy , because i do not have a vacuum bag setup YET. some day soon...

https://www.uline.com/Product/Detail/S-14534/Specialty-Tapes/Uline-PTFE-Film-Tape-3-4-x-36-yds?pricode=WB1986&gadtype=pla&id=S-14534&gclid=CjwKCAjwp7baBRBIEiwAPtjwxIK5ti2nEyo3l0nx2yCH WDuJjGmpjBvqzBBzk6c4x5qnIpiGJDK8UhoCvLgQAvD_BwE&gclsrc=aw.ds


application of initial pieces of tape , painting on resin:

https://i.imgur.com/5hMSyM6.jpg

resin setting up / curing in the sun:

https://i.imgur.com/FxOqVGW.jpg
https://i.imgur.com/TScwqL3.jpg

popping out the headlight ( i had sanded on the headlight a bit to smooth out the blending foam i used to make the transition around the bezel smooth )

https://i.imgur.com/alkYeJc.jpg
https://i.imgur.com/rwhDts6.jpg

after a couple more hours, ptfe tape removed, fairing bolted to bike to cure in place

https://i.imgur.com/7v4zOgH.jpg?3

after initial sanding and smoothing work:

https://i.imgur.com/igsqoy9.jpg



going to put some filler in , sand it some more, and then go for primer and see how i like it...

might be a total waste, might come out ok. i need the room behind the headlight for electronics at this point.

ransamuels
07-17-2018, 02:16 PM
Matt: That is a very curious choice for the epoxy. And for the fabric ... and for the tape. Were there reasons for using these materials instead of something from a West Marine store at about 1/4 the cost?

mattology
07-17-2018, 03:24 PM
Matt: That is a very curious choice for the epoxy. And for the fabric ... and for the tape. Were there reasons for using these materials instead of something from a West Marine store at about 1/4 the cost?

yeah i probably could have used some of that stuff, but i have a good amount of experience using this resin.

the carbon fiber fabric and ptfe tape i had laying around, lol

ransamuels
07-17-2018, 09:22 PM
I, too, have a bit of carbon fabric as well as uni-directional stuff lying about. But that weird epoxy and ptfe tape ... wow ... that is a different level of "stuff just lying about".

mattology
07-18-2018, 01:33 PM
I, too, have a bit of carbon fabric as well as uni-directional stuff lying about. But that weird epoxy and ptfe tape ... wow ... that is a different level of "stuff just lying about".


i think it will be a lot better with a vacuum bag setup for sure....

freedomgli
07-19-2018, 08:52 AM
i think it will be a lot better with a vacuum bag setup for sure....

A friend/mentor of mine who's been doing this a lot longer than I have recommends https://store.acpsales.com/categories/1625/resin-infusion for supplies. His next project is a full carbon fiber body for his Radical Clubsport. I'm still collecting parts, tools and materials to embark on my next big composite project. So far I have the part I need to recreate, a roll of chopped strand fiberglass mat and a JB Industries Platinum DV-200N vacuum pump. I have a long way to go! Resins, gel coat, mold wax, PVA mold release agent, clay, rollers, brushes, cups, metering pumps, core materials, various carbon fiber and fiberglass fabrics and filler materials, UV top coat, sandpaper, special scissors, veil and peel ply material, vacuum bags, various vacuum fittings, gauges, accumulators, switches, lots and lots of latex gloves, plywood, etc.

mattology
07-21-2018, 01:26 AM
new bellmouth printed for the bike...

https://i.imgur.com/UHBpQQS.jpg?1

can't wait to give it a go and see how it does...

turn off power jet before the pipe, turn on powerjet on the pipe, turn off power jet past the pipe again.... at least that's the idea...

https://i.imgur.com/v0bJhvx.jpg?1

mattology
07-28-2018, 05:01 AM
new carburetor installed

https://i.imgur.com/XlXdOWe.jpg?2

freedomgli
08-01-2018, 11:55 AM
While your air filter is functional, it's hindering your ability to get the most you could be getting out of that large velocity stack. Ideally, you'd have that velocity stack located inside a suitably large airbox that receives a clean, smooth and steady supply of filtered air.

mattology
08-01-2018, 12:23 PM
While your air filter is functional, it's hindering your ability to get the most you could be getting out of that large velocity stack. Ideally, you'd have that velocity stack located inside a suitably large airbox that receives a clean, smooth and steady supply of filtered air.

yeah i'll build one eventually

ToraTora
08-01-2018, 09:54 PM
That's one heck of a cone! I would think you'd want a nice long tube before the carb to provide more Bernoulli effect.

mattology
08-22-2018, 09:05 PM
i'll be home friday, i hope to try my new intake manifold over the weekend..

ToraTora
08-24-2018, 01:49 PM
Looking forward to the results!!! It totally looks awesome.

Rj_666
11-24-2018, 02:41 AM
Matt - have you found (or looked for) 3d printing filaments with characterisitics similar to Torlon, or PEEK ?
Curious about using it to build 'end caps' for wrist pins... I'd likely delete the 'c' clip, and design the end cap to snap in to the 'c' clip groove ....

Certainly not an original idea, but just following up on some older ideas.

mattology
11-24-2018, 09:24 AM
i actually just ordered a new hot end for my printer that is capable of 400C, so i should be able to print some of these higher end engineering materials such as peek and ultem. i may have to make an enclosure, and do some other stuff, but the big one is the hot end.

mattology
12-27-2018, 12:35 AM
update on the front fairing:

https://i.imgur.com/fDK4SRM.jpg

chadzilla1
12-27-2018, 11:00 PM
back home finally?? Are you going to do your dads too ?

mattology
12-28-2018, 01:14 AM
no, i am in texas for the next five months

chadzilla1
12-29-2018, 01:43 PM
damn lol making the money but cant play with the toys.

mattology
12-30-2018, 01:10 AM
getting the garage all done up in the process...

mattology
03-09-2019, 01:18 AM
garage is insulated and drywalled! needs some paint and then we will be in serious bike workshop business!

mattology
03-11-2019, 11:53 PM
i'm looking at doing dunlop moto3 slicks for the next tires. my friends who run minis on 17's out here are enjoying them.

freedomgli
03-12-2019, 07:04 AM
So long as you have a reliable source for them then sure, why not? It seems they have 2 compound choices for any given race. How fresh are they? I assume you have a set of tire warmers already and a generator/ battery/ inverter setup to run them at the track?

mattology
03-12-2019, 08:20 AM
yeah guys are running the softs everywhere. they would be brand new, straight from a dunlop dealer.. so i assume as fresh as possible.

yeah i have had warmers for my bikes since... 2013? i have two of the yamaha ef2000isv2 generators that i run in parallel to both power my house in case of emergency as well as power my fans/ tire warmer/ laptop while track side...

mattology
04-01-2019, 08:05 AM
https://youtu.be/YrBh39mFoIA


here's my dads latest at the local kart track lol.

mattology
04-21-2019, 06:02 PM
i was home for a week and i managed to do some things


first off, here is the upstairs of the garage. its almost time for moving the computer in there, 3d printer, 2d printer, etc

https://i.imgur.com/PgFEA7U.jpg?1

and here is the downstairs of the garage. it's still a big work in progress, i have to build work benches, etc etc. but i have air conditioning, insulation, and snaplock / race deck!

https://i.imgur.com/Opr2Ehq.jpg?1p

I also put the new front fairing on the 125. i'm happy with it!

https://i.imgur.com/5AtJa2f.jpg?1
https://i.imgur.com/8v1QPXG.jpg?1

i ordered a bunch of titanium fasteners for the front end of the 250 for the triple clamps and the new forks and wheels. i also boxed up the forks to be sent off to be nitrided

i fly back to texas for one more month on monday, and then i should have the ENTIRE summer off on vacation. so yeah, garage will get set up nice then, and i'll figure a way to get out on track once again.

freedomgli
04-23-2019, 11:18 AM
Looking good. Does your Racedeck flooring click when you walk on it or are foot steps reasonably quiet? Seeing your RS50/125 again reminds me I have a big front fork overhaul project to do on my own bike. I've got probably $500 in parts sitting on a shelf waiting for me to have the time and motivation to get it done.

mattology
04-23-2019, 01:22 PM
it is definitely noisier than regular concrete. it isn't as loud as say, my gf walking on high heels on regular floor, but it definitely has some click/clack to it. it isn't quite as loud as some people warned me about. i notice it mostly when the dogs are running around on it. i think if i would have put down some sort of underlayment or something underneath it would dampen the noise but i was worried about mold, especially in florida. usually i have the radio on, and in that case, it's what i hear over the clicking of the floor.

freedomgli
04-24-2019, 08:09 AM
I want to redo my garage and the Racedeck tiles seem like the best answer to give a real professional finished look. Ceramic tile is nice but too $$$ for me. I'd only to epoxy floor paint on a newer concrete floor and even then I'd pay pros to do it for me as I've had mixed results helping friends DIY in the past. We even rented the diamond grinder and etched the floor with muriatic acid and the paint still lifted in places due to wear and tear from car tires and general use. It was not as durable as I had hoped.

mattology
04-24-2019, 08:15 AM
yeah that's exactly why i didn't want to do it in the end. i had a few professional shops give me quotes, even had one come over and look at my garage floor, and none of them could really provide a solid defense as to how they could prevent " hot tire pickup " or whatever it's called with the epoxies. Not only that but to do a Jay Leno style polished semi gloss white / off white floor, they wanted almost 4000 dollars.

I was able to do the tiles for under 1000 dollars shipped. 90% of the tiles took me, no joke, 3 hours to install, including rolling out the stuff that was in the garage into the driveway, and leaf blowing / sweeping the floor clean.

The last 10% of the tiles needed to be cut with a table saw to fit around the edges of where the stairs go, and the edges against the walls of the two sides i didn't originally set as my datum walls. it was super easy and i love the finished results.

chadzilla1
04-25-2019, 01:27 PM
place is looking great

mattology
04-25-2019, 08:04 PM
Thanks dude, it's getting there

mattology
05-31-2019, 10:10 PM
At one point I honestly never thought this job would end!!!!!

Construction of the first stator started 9/8/18 and finished 12/4/18
The unit 2 outage started 12/8/18 and completed 1/15/19
The old unit 2 stator strip started on 1/8/19 and completed the rebuild on 4/11/19
The unit 1 outage started 4/22/19 and ended 5/27/19
I finished demobilization this week and I am flying home tomorrow, off for the whole summer.

Approximately 300,000 man hours were worked without a recordable injury!!!

Now I get to rebuild my kitchen of course, but in between that, I am going to give the little 125 a go with all of the new parts.

In case you guys also forgot, the following have been changed since the last time at the track and dyno

1) new cnc billet aluminium intake manifold designed by me because the nylon one leaked and the carbon fiber one warped
2) new cnc billet aluminium cylinder head insert designed by me using thiel/overmars tech
3) TMX38 from a late model Honda CR250 with TPS and a mikuni solenoid power jet (hopefully giving me better tip in timing and allowing me to pulse it on/off, kind of like a fuel injector)
4) wideband O2 sensor to try and help me get a better understanding of whether I am too lean or too rich

because you know, if you're not too confused as it is, the surefire way to get confused and lost is by throwing 5 more variables at things...

It's been since March 4 2018 that I've been at the track... I'm looking at a career change, cause I want to ride more, lol.

mattology
06-09-2019, 02:55 PM
Made it out to the track this morning, got two solid sessions in before the rain hit... but hey, it's better than being at work!! My dad was out also and both bikes ran pretty well. I had a couple of hiccups at partial/mid throttle somewhere around there, but i made no changes to the bike, i just wanted to ride it. I haven't looked at the logs yet but I was logging air fuel so it will be interesting to see what shows up on the sensor when it's all said and done.. Also I left my zeeltronic tuning cable with michael @ bucks down racing so he would be able to tune his 250, so i couldn't have made any ignition or power jet solenoid changes to the bike even if i wanted to.

Relative air density at bushnell this morning was 94.67%

I noticed my rear tire has a slow leak. time for new tires anyway, valve stems, etc etc....


whatever though, i didn't crash, and i had a great time. It was mostly learning how to ride again!


https://youtu.be/-vcAV-VYfmE

Kylipso
06-10-2019, 12:46 AM
When are you coming out to socal for some endurance shenanigans? :D

mattology
06-10-2019, 06:18 AM
when are the endurance races? in the past they have been during my vacation blackout period during the outage season

mattology
06-13-2019, 11:23 AM
trying some panning shots with the 50mm lens ( cliff's notes: it didn't end well )

https://i.imgur.com/KKmXNsp.jpg

https://i.imgur.com/qKbAUIA.jpg

mounted new tires... had to remember how to do it, haha.

https://i.imgur.com/y0QcBul.jpg?1

random picture i took with the dogs

https://i.imgur.com/5PLtmyo.jpg?1

125 current status, with new tires and ready for the track once again

https://i.imgur.com/YWTkdHW.jpg?1

chadzilla1
06-17-2019, 04:00 PM
what slicks are you using? Sava no longer makes them? As for the photo panning you need a good video pan head for smooth motion and you use continuous focus lock so its keeping focus on the bike the whole was across.

Bike looks great and nice shots with the bike, car, and dogs

mattology
06-17-2019, 04:37 PM
they're the very last of the Sava slicks, but PMT just came out with 17's for mini racing, and bridgestone makes good slicks for full size tracks as well. I'll probably get PMT's next

Rj_666
06-17-2019, 09:55 PM
Thats good news about the PMTs !
I was considering some of the GP3 tires for next years track bike project.

Kylipso
06-20-2019, 11:18 PM
when are the endurance races? in the past they have been during my vacation blackout period during the outage season

https://m1-grandprix.com/events_circuits/

24 hour is coming up in September, I think we're running a kx65 this time around :D
At some point I'll fix up the yz85 powered Aprilia for sprints.

mattology
06-23-2019, 08:35 PM
i raced with some kx65's today actually, they seem like a blast!

throwing my bike around the kart track is hard!

Here's some footage from today, with the new ignition timing and slightly leaner pilot jet (1 size down) the bike runs like a dream!


https://youtu.be/aogKTFlDdvk

mattology
06-24-2019, 11:59 AM
https://i.imgur.com/5Y8eTq8.jpg

https://i.imgur.com/xTHkh6o.jpg

dad:

https://i.imgur.com/V3tZCwA.jpg


me chasing eric on dad's bike

https://i.imgur.com/Rw4USS9.jpg

mattology
06-29-2019, 11:29 AM
made a friend while out at the track last time, his name is also Matt (sn: dextroyer sp? ) and he showed interest in building a 50/125 RMV125 disaster.

so of course, i let him take a spin on this thing:


https://www.youtube.com/watch?v=7pTk8cwQ3RI



I must say over the last two track days, especially with the modifications that i've done, i'm definitely improving on the bike in major ways.

the new setup has much much more overrev in the engine powerband. I can rev out and higher much easier, and if i want to rev above to stay in gear as opposed to shifting up and then back down again, I can. The engine routinely pulls right into the rev limiter which I have set at 12k, but I think i can probably raise it without any issue.

I think it is getting time to dyno it again and see how the powerband has shifted witht he new cylinder head insert. the initial throttle response is much smoother, the bike is much easier to open the throttle with, especially coming out of corners. I think this is mainly the combination of the lower compression due to the new insert, and less timing due to the TPS variable 3d ignition map that i put in. I think that since the behavior has changed so much since when i previously rode the bike, for the good, it's about that time to put it back on the dyno and see what we have. It will be interesting if it's down on power, but perhaps that is the case.

Other than replace the battery and replace the front brake fluid, i don't know what else the bike needs before the next track day. I am looking at palm beach international raceway Friday night, July 5th..

we will see!

chadzilla1
06-29-2019, 07:01 PM
Palm Beach, you're in my neck of the woods. Sucks I might go to St Augustine July 4-5 then Tampa 6-8 and back to Miami

Dextroyer
07-07-2019, 09:18 PM
Palm Beach didn't pan out, but you know what did? Me committing to build up another one of these bad boys! :lol:

Your bike performed fantastic! Me having no experience with a 2 stroke coupled with the lingering dread of riding someone else's bike is evident in your GoPro footage but it captured the moment that I was absolutely sold on having a bike like this that could pull double duty at the kart track and the big bike track. While the hairpins are definitely tight for a full size bike at BMP the little RS effortlessly flicks and feels so stable. Just wait till you ride my Grom next time we are out there (hopefully when it is not 95 degrees out) and get some perspective from a more mini moto.

mattology
07-08-2019, 11:39 AM
yeah so, where to begin? When we were out at bushnell, Matt ( Dextroyer ) showed genuine interest in building one of these.

I gave him my word on an agreement that if he was truly interested, would be too hard to pass up.

"i have a roller at my house. if you show up with an engine, you can have the roller and i'll put the engine in for you, just help out "

genuinely, i've told other people this before, so i didn't really believe he would actually act on it, as no one has before.

at least until he showed up with an engine! he bought a whole 97 CR125 runner that was taken care of. So he has all the good stuff and all the things needed to make the swap go as straightforward as possible.

https://i.imgur.com/6eDDqmW.jpg

i do wish i had the garage a little more organized and setup with like, workbenches and what not, but hey, it is what it is... air conditioned garage is still better than open air mosquito laden garage...

https://i.imgur.com/bgv8mWL.jpg

the stock motor mounts were cut off of the rear subframe and the lower kickstand and exhaust mount cross beam support

https://i.imgur.com/OYCPmZw.jpg

the snugulator roller location was notched out on the kickstand cross beam support as well

https://i.imgur.com/LsJqsco.jpg

with some careful measuring and double checking, we cut the swingarm and test fit the motor before making some final adjustments and then installing the bronze bushings

https://i.imgur.com/nxqz4dK.jpg

i 3d printed up a nylon spacer to fit inside the cr125 swingarm pivot bolt hole in the cases to adapt to the rs50 swingarm pivot bolt diameter. a perfect fit after some final dressing so we know that axially the front sprocket is exactly on the same axis orientation as the swingarm pivot and the rear sprocket ( although the rear sprocket angle can change due to the rear wheel / chain adjuster angle )

https://i.imgur.com/VTbn4NR.jpg

https://i.imgur.com/V1qPcSh.jpg

engine and swingarm installed

https://i.imgur.com/UNUMw1j.jpg

where we are currently...

https://i.imgur.com/ymHjXFj.jpg?1

Front Cradle, front radiator mount... that's really all I see it needing before matt can take it home and finish the rest at his place...

Dextroyer
07-08-2019, 11:48 AM
This build has me buzzing like mad! The super ironic part was that the day before we met at Bushnell I met someone who put a YZ125 motor in an 03 RS50 and spent the evening trying to find an RS online. I forced myself out of bed with 4 hours of sleep to go a 95 degree track day only to discover not one, but TWO of such bikes running the track an hour from home. The planets aligned for this to come together I swear!

freedomgli
07-09-2019, 07:23 PM
Awesome! You’re lucky to have the help of someone who’s been there and done that. With projects like this the hardest part is sometimes solving challenges like the chain roller or swingarm pivot. The blood, sweat and tears of fabrication is par for the course.

mattology
07-29-2019, 11:51 AM
Where are we now?

With a bike off to the new owner's home, of course. Matt said he would be able to handle it from the point of all the mounting / welding done, so we finished that up, and he took the bike home last night.

https://i.imgur.com/1VX6iLA.jpg

https://i.imgur.com/PPUKrl9.jpg

Chinese rearsets fit up pretty well

https://i.imgur.com/QfCPckV.jpg

https://i.imgur.com/OlNtbBs.jpg

with the original problem child in the background...

https://i.imgur.com/uS9F4eD.jpg

https://i.imgur.com/dY4t4UF.jpg

can't wait to see it out on track... get on it, matt, and congrats!

mattology
08-04-2019, 06:42 PM
more gopro fusion fun:


https://www.youtube.com/watch?v=9I_xv1Qp_Mk

Rj_666
08-11-2019, 12:50 AM
You're talking me into it, more every day.

mattology
08-11-2019, 07:49 AM
adam and i picked up a running riding 99% complete silver RS50 yesterday for $500!! another RMV125 is in the works!!

asechrest
08-11-2019, 03:45 PM
Here it is. 10 hours round trip! Thanks Matt!


386320

chadzilla1
08-13-2019, 01:15 AM
10 hrs where was that at? Not as bad as the bike I want in Indiana trying to figure out how to get it back to Florida myself lol Bike looks amazing for $500 does it run lol

freedomgli
08-13-2019, 07:47 AM
Here it is. 10 hours round trip! Thanks Matt!
[emoji106] that looks like a bargain for $500 plus $200 in fuel. This is the kind of RS I need so I can better preserve my mint RS.

asechrest
08-13-2019, 09:07 AM
Tampa to Tallahassee. Bike runs and shifts. Needs some cleaning and it's been down on the left side but not bad. Currently on the search for a donor CR125. The AM6 from this one will go up for sale after a carb clean and compression test.

chadzilla1
08-13-2019, 09:56 AM
what ever did you do with your derbi?


Tampa to Tallahassee. Bike runs and shifts. Needs some cleaning and it's been down on the left side but not bad. Currently on the search for a donor CR125. The AM6 from this one will go up for sale after a carb clean and compression test.

asechrest
08-13-2019, 10:24 AM
what ever did you do with your derbi?

Still have it. Will probably put it up for sale to help fund this project. I also own a boat, so I need two bikes like I need another hole in the head.

Dextroyer
08-17-2019, 04:15 PM
Oh man now it is a race to see who gets their RMV finished first!

asechrest
08-17-2019, 04:53 PM
Oh man now it is a race to see who gets their RMV finished first!

You may win! I don't have a donor CR125 yet.

But I am looking forward to track days with 4+ RMVs!

Dextroyer
08-17-2019, 07:06 PM
Oh man that is gonna be the day! Maybe I can convince Rich from Corsa Motorworks to bring out his YZ125 powered RS50 roadbike too? He just picked up another roller and is undecided whether it will be get another YZ motor or an AM6. I would love to see a whole grid of these things. That bike you just scooped up looks great! I guess I should start a thread for my build on here since I am going slightly different of a route with it.

asechrest
08-17-2019, 08:13 PM
Oh man that is gonna be the day! Maybe I can convince Rich from Corsa Motorworks to bring out his YZ125 powered RS50 roadbike too? He just picked up another roller and is undecided whether it will be get another YZ motor or an AM6. I would love to see a whole grid of these things. That bike you just scooped up looks great! I guess I should start a thread for my build on here since I am going slightly different of a route with it.

Looking forward to following your build thread. Once I've got my donor motor I'll start one as well.

mattology
08-26-2019, 08:30 PM
more fun on track...

day ended with my o2 sensor cracking off, so i had to weld that back up. lol

i'm trying to get better ergonomics on the bike so i have moved the pegs forward in the rearsets, and added some hydrofoam to the tank a la jorge lorenzo to try and make locking my knee in and hanging off the bike easier.

we will see...


https://www.youtube.com/watch?v=IlwLuMh3U10

Dextroyer
08-26-2019, 11:12 PM
387265
387266
387267
387268

twinturba
08-27-2019, 12:29 AM
looks like fun!

mattology
08-27-2019, 08:40 AM
Sweet thanks for the pics!

freedomgli
08-27-2019, 11:01 AM
Love seeing the two bikes cutting it up and the last pic wheelie-ing past the photog. Great shots!

mattology
08-27-2019, 01:36 PM
yeah, with short track gearing they power wheelie in first very easily! lol. the front wheel can even come off the ground coming over the bridge sometimes..

mattology
08-31-2019, 12:29 PM
so as i mentioned briefly above, i need to improve my body positioning on the bike and one thought i have had is that my current peg sliders were causing me issues

https://i.imgur.com/UwXCkOu.jpg

that delrin spacer / knob on the end was causing my boot to slip whenever i was on the end of it. so that's horrible for when you need that security in order to brace yourself on the bike by your legs and hips and feet.. so off it goes, along with moving the pegs forward to get my knee and leg more into the tank easier.

https://i.imgur.com/veMvHOY.jpg

i then printed up a new design peg slider, that mounts to one of the other lower farther back rearset holes, and comes out farther. this is out of carbon fiber reinforced nylon.

https://i.imgur.com/5PijxDa.jpg
https://i.imgur.com/1Gu3Ls4.jpg

when laying the bike over, the pegs nor shift pedal doesn't touch, and neither do the sliders. ( the bar sliders, axle sliders, and spool sliders all touch however)

https://i.imgur.com/2B7Y0Vj.jpg
https://i.imgur.com/mkasGHm.jpg

just in case, however, the sliders are on there. they're required for the local kart track i run at.


here is the hydro turf i added to the tank so far, although i may add more.

https://i.imgur.com/KDasX7Y.jpg
https://i.imgur.com/nxLYYGr.jpg

Dextroyer
08-31-2019, 01:18 PM
Those peg sliders look neat! I bought a roll of 1/4in neoprene to do my race seat with. I think it could work as tank grips as well. I will have plenty extra.

mattology
09-05-2019, 05:14 PM
new pipe developments ....

Dextroyer
09-06-2019, 10:54 PM
new pipe developments ....

You have my attention...see you tomorrow! haha