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tuning my 50cc supermoto

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adamcpi50sx08
Renault 5 Driver



Joined: 08 Dec 2008
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PostPosted: 22:25 - 13 May 2009    Post subject: tuning my 50cc supermoto Reply with quote

i got a cpi supermoto 50 totally standard except from i have added a slighty bigger jet and changed the sprockets because the old ones were part of the restriction, the bike tops out at 45-47mph, i have been told that i should get a race exhaust because the stock cpi exhausts are still restricted inside the expansion chamber, a racing air filter and jets to suit, i have also been told by a different person a racing exhaust and a bigger carb(you get a racing filter with the carb) will make it a bit quicker but my dad sed that a bigger carb will over fuel it and damage the engine somehow, is any of this right and do any of you have any suggestions to make it a bit quicker, i know its only a 50cc but i only want a extra 10mph or so

if it helps im running 13 front and 52 rear sprockets
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Hutchysrs50
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PostPosted: 23:12 - 13 May 2009    Post subject: Reply with quote

Jolly moto race exhaust
big bore kit
19mm / 21mm carb
racing stator/pickup with coil to match
a good K&N filter
racing reed valves + block if ya like
racing crank, polished + stuffed webs


Ta-da
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Hutchysrs50
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PostPosted: 23:14 - 13 May 2009    Post subject: Reply with quote

or

dont get a K&N filter, there pretty naff actully.

get a decent exhaust and upjet the carb, 13t sprocket should be enough, put a 14 on if you want more top speed and slower acceleration.

putting a bigger carb on, with a restricted exhaust and standard cylinder isnt a good idea, and unless you set it up rather well, probly wouldnt run anyway. Thumbs Up
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adamcpi50sx08
Renault 5 Driver



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PostPosted: 10:44 - 14 May 2009    Post subject: Reply with quote

i dont want to fit a big bore kit because im only on a cbt and they do actually pull us over and check the bike over up here and i dont want to chance getin done for no licence or insurance when i actually do have one, do you think a decent exhaust, perfect or nearly perfect jetting and maybe a set of racing reeds and block will do much and i hear that all the aftermarket airfilters (k&n, doppler etc) suck water when it rains and make the bike run very bad but i have found two doppler filters that probs wont suck water if i position them properly, what do you think

http://www.adrenalin-pedstop.co.uk/ThumbnailGenerator/default.aspx?File=979eb538-afe7-4172-9e3c-2c0ed237577a.JPG&width=230&height=230

http://www.adrenalin-pedstop.co.uk/ThumbnailGenerator/default.aspx?File=701cd056-43fd-4431-b7a2-cf817cd34e07.JPG&width=230&height=230


and also whats this about drilling holes into the airbox lol
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CPI 50 SX 2008 - NO MODS YET EXCEPT FROM A SET OF ACERBIS HANDGUARDS
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c_dug
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PostPosted: 10:57 - 14 May 2009    Post subject: Reply with quote

Your licence restricts you to 30mph anyway...

c_dug
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adamcpi50sx08
Renault 5 Driver



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PostPosted: 11:22 - 14 May 2009    Post subject: Reply with quote

yes but i think its a bit easier to tell that the bike goes quicker when its got a big bore kit etc and also that will void my warranty where if i just add the pipe etc i can remove them and refit the stockers for warranty repairs, also i dont want to spend stupid money on my 50cc when its gonna be gone by the end of the year when i go for my a2 licence
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element
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PostPosted: 11:48 - 14 May 2009    Post subject: Reply with quote

adamcpi50sx08 wrote:
... i dont want to spend stupid money on my 50cc when its gonna be gone by the end of the year when i go for my a2 licence


dont bother tuning it then.. save the money. seriously..
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Hutchysrs50
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PostPosted: 15:23 - 14 May 2009    Post subject: Reply with quote

adamcpi50sx08 wrote:
i dont want to fit a big bore kit because im only on a cbt and they do actually pull us over and check the bike over up here and i dont want to chance getin done for no licence or insurance when i actually do have one, do you think a decent exhaust, perfect or nearly perfect jetting and maybe a set of racing reeds and block will do much and i hear that all the aftermarket airfilters (k&n, doppler etc) suck water when it rains and make the bike run very bad but i have found two doppler filters that probs wont suck water if i position them properly, what do you think


Drilling holes in the airbox just lets more air pass through it, having the same effects as a K&N filter.

if you ha ve a supermoto bike with an open K&N filter, if rain goes on it, it will ovbs be sucked into the engine.

i wouldnt bother with the reeds/block personaly, as there quite sensitive, dont think they make that much differnce anyway.

personaly, if it was my bike...

i would get a race exhaust (any aslong as its a straight through pipe(
put a bigger front sprocket on by 1 size, and upjet the carb about 4 sizes than the one thats in.
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Finglonga
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PostPosted: 17:30 - 14 May 2009    Post subject: Reply with quote

adamcpi50sx08 wrote:
yes but i think its a bit easier to tell that the bike goes quicker when its got a big bore kit etc and also that will void my warranty where if i just add the pipe etc i can remove them and refit the stockers for warranty repairs, also i dont want to spend stupid money on my 50cc when its gonna be gone by the end of the year when i go for my a2 licence


Following you down the road at anything over 30mph is a bit of a giveaway that it is no longer a moped and is now a motorbike.
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Theoutsider
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PostPosted: 17:48 - 14 May 2009    Post subject: Reply with quote

Hutchysrs50 wrote:
adamcpi50sx08 wrote:
i dont want to fit a big bore kit because im only on a cbt and they do actually pull us over and check the bike over up here and i dont want to chance getin done for no licence or insurance when i actually do have one, do you think a decent exhaust, perfect or nearly perfect jetting and maybe a set of racing reeds and block will do much and i hear that all the aftermarket airfilters (k&n, doppler etc) suck water when it rains and make the bike run very bad but i have found two doppler filters that probs wont suck water if i position them properly, what do you think


Drilling holes in the airbox just lets more air pass through it, having the same effects as a K&N filter.

if you ha ve a supermoto bike with an open K&N filter, if rain goes on it, it will ovbs be sucked into the engine.

i wouldnt bother with the reeds/block personaly, as there quite sensitive, dont think they make that much differnce anyway.

personaly, if it was my bike...

i would get a race exhaust (any aslong as its a straight through pipe(
put a bigger front sprocket on by 1 size, and upjet the carb about 4 sizes than the one thats in.



Oh yes they do.I changed the reeds on my other bike (RS50) and it made the difference.
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Theoutsider
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PostPosted: 17:56 - 14 May 2009    Post subject: Reply with quote

Get a exhaust,go for an arrow or jolimoto.With the standard exhaust you have progresive speed,with a race exhaust the engine will stay reved even if you change a gear up.As long as you don`t have electric restrictors don`t bother.Get a bigger sprocket 14 tooth like hutchyrs said.Buy a box of jets.Get a 21 mm carb.buy few spark plugs if it runs well after you jet it take the spark plug out,see how it is like.If it runs fast don`t be fooled it could run lean or rich.I think it should do a top speed about 60.In my opinion nearly 50 mph it is fine.Don`t mess up with a 50cc.The bigger the tuning is the more unreliable will be.I used to change rings every 2000 miles with my rs.Also you don`t have to change the crankshaft if you are planning to keep the standard cylinder.Don`t go for a big bore,you will regret it.Keep the standard airbox,don`t go for fuckin` k&n faho&fahf.The best performance is the standard one.Good luck
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Safetyman73
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PostPosted: 07:31 - 16 May 2009    Post subject: Reply with quote

CPI do a kit for this bike as my sons was done the front sprocket is 13 the rear 51 new jet for the carb and a new front pipe thats all it entails. If i remember the kit was 148 all in.

Hth
Eddie
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ms51ves3
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PostPosted: 10:38 - 16 May 2009    Post subject: Reply with quote

Safetyman73 wrote:
CPI do a kit for this bike as my sons was done the front sprocket is 13 the rear 51 new jet for the carb and a new front pipe thats all it entails. If i remember the kit was 148 all in.

Hth
Eddie


That just sounds like de-restriction to me.
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adamcpi50sx08
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PostPosted: 22:04 - 17 May 2009    Post subject: Reply with quote

yes that is the cpi derestriction kit, so is there no way that a properly jetted 21mm carb will harm my engine or its reliability with out a big bore cylinder kit etc
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tutton
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PostPosted: 22:19 - 17 May 2009    Post subject: Reply with quote

Depends a 21mm carb still not jetted and oil pump compensated for the more fuel will damage your engine, badly.
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adamcpi50sx08
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PostPosted: 22:30 - 17 May 2009    Post subject: Reply with quote

i think i'll leave the carb actually becuase i dont really want too blow it up lol, do you guys think a doppler reedblock will be much different to the stock or will mine be the same if i just fit the doppler reeds
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tutton
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PostPosted: 22:32 - 17 May 2009    Post subject: Reply with quote

Reeds are the same
your playing with the air-fuel mix which is as bad as the carb
and could still blow it up if you give it too much air making it run lean.
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c_dug
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PostPosted: 22:32 - 17 May 2009    Post subject: Reply with quote

Changing the exhaust but leaving the carb as standard is whats likely to blow it up in the first place, i would at least advise changing for a bigger main jet, the exhaust manufacturer should be able to advise of or provide the correct size Thumbs Up

c_dug
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adamcpi50sx08
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PostPosted: 22:42 - 17 May 2009    Post subject: Reply with quote

i know that you have to rejet when getting a different pipe and im going to buy a box of jets with exhaust
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c_dug
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PostPosted: 23:17 - 17 May 2009    Post subject: Reply with quote

Cool, just checking Thumbs Up

c_dug
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