Super Slow/Sluggish RS50 - Need Help!! (modded)

[EJD]

Ok so most of you already know about my bikes issue but this is all worth reading as I am going to cover it all in more depth.
I am going to make this post as a kind of diary first to explain what I did in order then I will ask a few questions and see if any of you are of help xD

Day 1:
Needed its first refill, used Shell-V-Power and used a 1:50 pre mix of 2 stroke oil.
Ran first mile good but went supper sluggish after that.

Day 2:
Cleaned out tank, carb, fuel lines, filters, exec.
Checked spark was super black but it was from the oil.
Topped up again with fresh oil and tried again.
The bike acted the same.
It is really slow up hills doesn't go much faster than 5Mph @3K revs and struggles to get past 6K revs on the flats.
Compression was about 85.

Day 3:
Fitted new WR7 exhaust kit, 75 jets, and polini filter.
Bike acted the same and was super slugish like day 2.

Day 4:
Took apart top end, re built, and the bike acted the same.

Day 5:
HUGE mess up with cylinder gaskets leaking coolant into crank exec.
Cleaned carb, crank, top end, exec
fitted mallosi .30 reeds.
Bike ran like a bag of shit again.

day 6:
got told I had an aftermarket cylinder head so bought a new 50cc doppler peformance kit that IS MADE for my exhaust for both top and low end power gain.
re fitted everything, tried bike again and it acts like shit YET AGAIN.

Day 7:
I write this xD

Ok, So Here is a little bit more in depth of what my issue is.

Set of up the hill @3K revs, bike quickly gains upto 4K revs then hits almost like a rev limit.
It seems like its not getting fuel and its struggling to keep up any power.
As I reach the top of the hill it takes a good 20 seconds to reach 6K revs and never wants to touch any more.
In 6th it gets to about 25 at 6K revs and thats about all it can do.

I took the carb completely apart and cleaned each and every little piece.
I bought a micrometer and measured my reeds.
I also bought a new iridium 9 rated plug.

What else can I do?
My compression is now 120+
Everything sounds good and runs perfectly.
It revs upto 12K+ in neutral.
And when I put the bike on a padock stand and run it in 1st it climbs to 12K revs perfectly.
Soon as I sit on it and its under load it all bollocks up xD

My spark is a little black @jet 75 but its dry and its fully coated in oil and neither is the exhaust can tip.
The bike smokes a little white smoke nothing un-usual.

I will put up a video of hos the bike runs tomorrow.
And yes the throttle works fine and the clutch isn't slipping exec.

Personally I think the dellorto sha1412l carb is just a piece of shit and I need to get a new doppler or polini carb.
Which is most certainly on my list xD

One think worth noting is the bike pulls very well at 3k revs and gets me moving quickly put cant gain any MORE power after that.



Anyway, Big thank you for everyone who has helped in my previous threads but still need a bit more advice.
And please don't tell me I don't know how to ride, it used to work perfectly before that fucking REFILL!!!
Oh btw, Got 5Liters of fresh v-Power from a different station to see if the fuel was dodgy before.

[RS_Patrick]

Your giving me a headache, the bike was fine wen you bought it and you just started messing with it with out knowing what you where doing or what you needed to do to get to what you wanted, while both Chris and me told you multiple times what was all you needed to do...

[rs250lape]

sounds like you need to get a different carb or work on your air fuel mixture. also if your running stock cdi there is a slight rev limit on it where you get to 6000 and it stutters and then it should rip into the higher rpms.

[EJD]

Your giving me a headache, the bike was fine wen you bought it and you just started messing with it with out knowing what you where doing or what you needed to do to get to what you wanted, while both Chris and me told you multiple times what was all you needed to do...

Patrick, I respect you for all that you have helped me with BUT THE BIKE WORKED FINE BEFORE!!
I only cleaned the pannels exec before I did the re fuel that fucked it up.

I never touched the engine/carb exec in the slightest way before it started acting up.
In fact Chris was the first person I texted the second the bike started acting up as I didn't want to touch things I didn't at the time know about.

[EJD]

sounds like you need to get a different carb or work on your air fuel mixture. also if your running stock cdi there is a slight rev limit on it where you get to 6000 and it stutters and then it should rip into the higher rpms.

New carb and a yellow peformance cdi is what I had in mind.
But if you give it time like 40 secs it goes into its power band and pulls a bit more.

[chrism15]

mate your kit isnt ment for low end power (through the rev range) it is a higher reving i
kit - you cant get it where you got loads more power low down and higher up in your case your powerband is much higher

like ryan said with his higher reving 50cc kit they are a dog up and sort of hill coz you need to rev the tits of them to get in the powerband but the revs just wana dive down....coz its a hill and thats what happens lol

is it slugish of flats? coz the thing is it will be slow on a hill, dont expect it to do 12000rpm up a hill....

have you tryed a 12 tooth sprocket? you keep saying about it not reving up as much on hills and being sluggish, CHANGE THE SPROCKET ....

get a new carb, as far as i know doppler dont make carbs, get a dellorto phbn carb or a polini flatside 19mm

mod the airbox the same as patrick did it as close as you can to how he did it

have you got the correct spark plug in now? they say in the product descripion that a 10 spark plug is needed so use a 10 not a 9 coz this kit is obviously gonna run a bit hotter ... BR10EIX or BR10EG

[rs250lape]

I have to say I went up a decent size hill at 40 and this hill gives my car shit sometimes going up it stay in the rpms and it should be fine i do have the pink 75cc kit though

[chrism15]

yerr ejd has a 50cc cylinder

top performance 75cc kit will give you some good performance

auto peds slow down on hills too to like 10mph and rev at about 4k all the way up, its just like going up a hill on a push bike your only able to pedal so fast and if you go up a hill you slow down get tired and sooner jump off and push it coz it to steep

[Glen1990]

Patrick, I respect you for all that you have helped me with BUT THE BIKE WORKED FINE BEFORE!!
I only cleaned the pannels exec before I did the re fuel that fucked it up.

I never touched the engine/carb exec in the slightest way before it started acting up.
In fact Chris was the first person I texted the second the bike started acting up as I didn't want to touch things I didn't at the time know about.

this is gonna sound soo stupid but you didnt get water in the air filter did you? sounds like a carb or cdi problem to me prob the carb set up

[Glen1990]

yerr ejd has a 50cc cylinder

top performance 75cc kit will give you some good performance

auto peds slow down on hills too to like 10mph and rev at about 4k all the way up, its just like going up a hill on a push bike your only able to pedal so fast and if you go up a hill you slow down get tired and sooner jump off and push it coz it to steep

my moped went 45mph maybe 40mphish at he worse destricted with only a sports exhaust i guess you wont have to be in the right gear or anything so you get it right every time

[EJD]

After all that I have put on the bike you think a 13 sprocket makes it take 40 seconds+ to go past 6K revs?

Nah, Im going with the carb being shit.
Its the only thing that I haven't replaced yet and judging from other threads its a shit carb.


Any way, thanks for all the help so far

[ryanperkins]

After all that I have put on the bike you think a 13 sprocket makes it take 40 seconds+ to go past 6K revs?

Nah, Im going with the carb being shit.
Its the only thing that I haven't replaced yet and judging from other threads its a shit carb.


Any way, thanks for all the help so far

change the sprocket! its only £6 lol will help you out LOADS and is very quick!

but polini (19.5mm carb ive got one comes with correct manifold to

[chrism15]

12 tooth sprocket will make it rev up quicker, accelerate better and it wont struggle AS MUCH on hills coz its a lower easier set up

like ryan says its £6 haha

[nathan k]

A video would really help determine what is wrong with it

[ryanperkins]

12 tooth sprocket will make it rev up quicker, accelerate better and it wont struggle AS MUCH on hills coz its a lower easier set up

like ryan says its £6 haha

+1 might aswell try this before the expensive carb, its quick easy and can get some fun results (front up )
i played with a 12,13 then 14t on mine 12 picked up like crazy, didnt break a sweat on hills, 13 was abit worse but pulled just over 70mph but over revved in6th
stuck on a 14t which still banded HARD! got off the clock rather easy and on a nice flat still over revved (sometimes depending on wind)

the point is youll get better results and whilst your trying to solve this problem it will help with the hills, then when you get her running spot on, take 5minutes to stick on a bigger one

also like nathan said a video would help alot :P