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View Full Version : Aprilia RS 50 1998 Project 1st timer Help!!!



Mattyboi
05-24-2013, 09:11 AM
I have a Aprilia rs 50 1998 model square shape, i am only 16 so i have limited knowledge on Motorcycle though my Father is a keen motorcyclist and knows his was around a bike and my brother is a mechanic so also knows a little about bikes, it has a 70cc Bore Kit on it and has been sat in a shed for around a year. I have bought it for a bargain and am going to take the engine to be rebuilt next week as the bearing/ bottom bearings have gone or something. It also needs a new exhaust so i am wondering if anyone has any experience mostly on the 1998 model, and could help me and suggest the best parts as i have just entered the world of Aprilia's and have yet alot to learn!

I hve 600 to spend at the minute but am keen to spend even more than that on it as i want a stunner of a motorcycle as my first project.

Cheers Matt.

apriliamandan
05-24-2013, 09:45 AM
Hello Matt!
First off, you have picked the right bike! These bikes are great fun whatever your age!

Do you mean crank bearings have gone or the big end bearing?

Crank bearings cost 30 for a quality set.

If the big end has failed then it will need a new crank. New stock cranks are around 70. Race stronger Cranks are 100+

If you need any parts then get them off Adrenalin Pedsstop....brilliant customer service and stock every engine conponant needed. They do crank bearings and crank shafts which by the sound of things you need. The Tecnix crank they do for 70 odd is really good, my father is running this crank with a 7 port 70cc top end.

So you can do a full bottom end rebuild for around 100.

My father and I managed to do a full engine rebuild (bottom end and top end) and had it running within a weekend. Im sure you and your brother & father could do the same if they both have reasonable knowledge. Try and avoid ever taking a motorbike to a Garage.

Hope the helps

Dan.

RS_Patrick
05-24-2013, 11:04 AM
Minarelli AM engines are all the same mostly, verry little difrence trough out the year.

In your case since it has a single side swingarm it needs a specail sprocket thats narrower and has a slight offset in it compaired to the 1999>2005 models.
Chainsize is 415, and sprockets are 3/16 wide.

Post some pictures of the bike.

Mattyboi
05-25-2013, 02:07 AM
Hello there again yes im pretty certain it needs a bottom end rebuild i think, though i will double check and it also has a little bit of water in the engine also, i am taking it the the previous owners regular garage as he knows the owner well and it is basically a motorcycle tuning company, they specialise in rebuilding engines and i will be able to get a good deal. I have been told to get a new crankshaft and not really to get a standard one so i definatly considering a racing one. And another thing is a Racing exhaust to cope with the more power rather than the standard 50cc exhaust that has seen better days. So i am starting on the bike next week and will post regular pictures and updates.222323
This is the closest picture i can find to the bike on the internet, it is yellow, same shape and same colour wheels! :)

RS_Patrick
05-25-2013, 11:53 AM
Take some pics with your Phone or a camera and upload the pictures to photobucket.com and just copy and past the "IMG" link here.

apriliamandan
05-25-2013, 12:25 PM
A race expansion chamber will free up some more power yes.

Stock crank will probably hold out fine, but if you have the extra cash then get a Doppler or Polini Crankshaft.

Make sure you get quality crank bearings aswell.

I wouldnt trust a garage to do a bottom end rebuild on my bike! Do it yourself!

Mattyboi
05-25-2013, 02:41 PM
Hello guys a quick update im going to keep the current RS50 exhaust as when i get the engine sorted out i will need to break in the new bore kit anyway and won't do more than 30-40mph, i have decided on a Racing Crankshaft and im taking my bike to CB Tuning based in P'Boro as they specialise in RS50's engines and all that i know it may be easier and cheaper to do it my self (bottom end re-build) but have been told by a close friend who had a RS50 to go to these guys as they know exactly what they are doing ans they will dyno test it and all that and tell me what else needs doing to improve its performance to make it run better. Other than that thats the situation at the minute, and thanks Dan i will look into these Cranks you mentioned, and guys you still havent reccomended an exhaust for when i do get one, is an Arrow exhaust alright or is that for 125cc's? And what about Doppler. Gianelli, Scorpion? Cheers Guys!

RS_Patrick
05-25-2013, 08:16 PM
You need an Exhaust specificly for the <1998 Extrema model or else the single sided swingarm might be in the way.

Arrow or Giannelli has some nice pipes for your bike.

Doppler makes a really good race crank thats reinforced on one side, needs a specails bearing but comes suplied with that in the box, imo its the best crank to buy for your money.

I would do the build my self with your brother and father and a bit of our help if you got questions, i can mail you a couple of difrent workshop manuals for the engine, so incase one doesnt show something really clear, one of the others wil.

Mattyboi
05-26-2013, 01:51 AM
RS Patrick that would be great, and yes i am looking to get arrow to be honest, and yes i guess doing it my self would provide me with some experience, my email is matthew.tinkler@live.com.

apriliamandan
05-26-2013, 05:35 AM
I have an Arrow street pipe on my rs50, power is very impressive for what it is. I havent had first hand experience with the others but Doppler, LeoVince and Gianelli are all good from what I have heard.

Crank wise, get a Doppler of Pedstop. Brilliant price. What 70cc top end are you getting for it?

Matt, it will be a big learning curve for you to rebuild the bottom end yourself with our help. It will teach you a lot. I can't trust any garage or 'specialist' as how do we know whether they have cut corners? If that was me, I would order in all the parts you want and then if you are still not wanting to do it yourself then get your chosen garage to do it. Its better to order your favoured parts in other wise the garage could get cheaper pattern parts etc.
Its totally up to you though, maybe the next rebuild you will do yourself. :)

RS_Patrick
05-26-2013, 08:06 AM
Dont post your email on here... should have PMed it to me.

Cheapest crank in stock is the Doppler, and i would really get that one if your going for a 70cc kit.
The crank apriliamandan means is not reinforced to prevent it from snapping with 70cc or more kit.

I see the doppler is oversized now on both shoulders so you need these bearings with them:
http://www.adrenalin-pedstop.co.uk/p-SKF_over_sized_bearing_for_Doppler_and_Top_Racing_ crankshafts-5228.aspx
For that price i can buy 2 of them here... size should be 6204 C3 (stock size is 6303 C3)

RS_Roadrage
05-26-2013, 09:56 AM
I really recomend the doppler crank, quailty is so much better than its 'replica' top racing crank, you will need TWO oversize bearings for that crank and they are NOT supplied to have to be baught, i think the older doppler er1 crank was different as that only had 1 oversize bearing if i remember correctly? And that one had it supplied

RS_Patrick
05-26-2013, 02:31 PM
I really recomend the doppler crank, quailty is so much better than its 'replica' top racing crank, you will need TWO oversize bearings for that crank and they are NOT supplied to have to be baught, i think the older doppler er1 crank was different as that only had 1 oversize bearing if i remember correctly? And that one had it supplied

Correct, the older crank only had one oversized bearing wich came with it, the new one needs 2x 6204 C3 bearings wich you have to buy your self.

Mattyboi
05-26-2013, 03:55 PM
Definatly thanks RS_Patrick i will definatly go about buying what you reccomended and yes Dan i will also look at getting possibly an arrow will get some pictures in the next coming days, and Dan where abouts in Cambridgeshire are you, just wondering as if you were to sell any parts or tools if i were to do the re-build my self?

apriliamandan
05-26-2013, 04:32 PM
Ill Pm you Matt.

RS_Patrick
05-27-2013, 10:38 AM
I send you the manuals later if i dont forget again, otherwise PM me. bit bussy here.


Edit: email has been send.

nathan k
05-28-2013, 05:32 AM
I really recomend the doppler crank, quailty is so much better than its 'replica' top racing crank, you will need TWO oversize bearings for that crank and they are NOT supplied to have to be baught, i think the older doppler er1 crank was different as that only had 1 oversize bearing if i remember correctly? And that one had it supplied
Well, My mate uses the Top Performance crank and hasn't had a problem. Been running it 6-7 months?
I use the ER1 Crank with a Doppler 'Street' Pipe and the Italkit 74cc, I must say. It's a pretty good match up.

apriliamandan
05-28-2013, 05:34 AM
Top Racing is very different to Top Performance though Nathan.

Mattyboi
05-28-2013, 08:33 AM
Thanks guys and cheers Patrick recieved all the manuals thats great!!

RS_Patrick
05-28-2013, 05:38 PM
Top Racing is very different to Top Performance though Nathan.

Two completly difrent brands...

rs50streetR
06-03-2013, 08:16 AM
nice to not be the only one with an rs50 98 model :lol:
these bikes most parts are easy to get for it however you need the single sided key that moves the hub to adjust the rear sprocket as i found out myself they usually get hit with a hammer and chisiel (sorry for my spelling im dyslexic ) otherwise the hub is no good and there a bitch to get hold of so if you find a good one cheep well woth getting as a spare
for engine im running a dellorto 19mm carb on std airbox 15-44 gearing (standard rear sprocket 15 frount is a upsize ) i have a af1 downpipe im told and i fitted an rs125 end can (had to re drill to fit can ) and ive seen 70mph pushing it 60 - 65 is what it do without holding it there i do however think i have a preformance barrel 50cc barrel as i chaged the piston and rings and the barrel had no cc markings or anything :L but yeah for exhaust most of them hit the mark on these bikes as long as you upjet the carb correctly etc you cant go wrong

if got any questions ill be happy to help as i own one of these as your see my one off very custom :)

RS_Patrick
06-03-2013, 10:00 AM
you can just stick a steel rod or thick screwdriver throught the hole on the wheel into the hub and wen you turn the wheel the hub turns... some people are to retarded to get that idea though and start hitting the hub it self to turn it.

nathan k
06-03-2013, 12:57 PM
Ahhh Misread, my bad.

rs50streetR
06-05-2013, 04:39 AM
you can just stick a steel rod or thick screwdriver throught the hole on the wheel into the hub and wen you turn the wheel the hub turns... some people are to retarded to get that idea though and start hitting the hub it self to turn it.

yeah good point that however i got the tool just for ease allthough i found when i tryed to use a metal rod it was a bitch to turn probably never been moved though as lack of maintance 50cc bikes get

RS_Patrick
06-06-2013, 01:44 PM
I use the rod from a wrench set for it my self, works fine especaily if you put the bike on a pitstand (easy to make as you just need a pitstand with a pin that goes trough the axle)

rs50streetR
06-10-2013, 03:18 AM
I use the rod from a wrench set for it my self, works fine especaily if you put the bike on a pitstand (easy to make as you just need a pitstand with a pin that goes trough the axle)
fair shout ill keep that as a thought to do once moved
by the way any news on your rs 50 back to this guys post

littlefeller
06-16-2013, 12:44 AM
post some pics, im curious to see if its my old one, I had a yellow 98.