HELP NEEDED ON THE 2003 APRILIA RS125 GP-1 REPLICA

brindo34 · L Plate Warrior Joined: 17 Mar 2005 Karma :

Hi, i have a similar problem, i got the bike with 2500 km on the clock. when i go the bike it would not rev cleanly, i changed the plug, then took the carb off. i found that the person who had it before brought the bike as an ful power italian import, then restricted it and un-restricted it. when i took the carb off i found that they had ground out the throttle slider on the reed side, to force it to idle. i replaced the carb so that it was standard set-up and then the bike revved cleanly but would not idle. i changed the idle jet too 68 rather than 62, its slightly better but still cant get it to idle above 1000rpm. but there is also a mis fire at 6000rpm. i have changed the plug, clean the power valve, check the reed valves. any ideas how i can get the bike to idle??

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Not a clue why they would have attacked the carb like that. I would be more worried that they had damaged it somehow and a lump of the carb slide had landed up in the engine.

The large screw on the side is to adjust the idle speed. This should be capable of getting it to idle at very high revs. If this is not allowing the revs up then I would start looking in more detail at the engine, and do a compression check at least. Also check they put the power valve in the right way up as that is a common error.

All the best

Keith
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simon1221 · World Chat Champion Joined: 28 Jul 2004 Karma :

Run it for a while, the take off the air filter and see if there is fuel sitting in the air filter tube or the bottom of the carb, if there is then either:

Float level too low

Air filter Blocked

Mixture wrong

Have a fiddle around with the idle mixture screw (carefully)
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Rs-Sean · L Plate Warrior Joined: 09 Jun 2005 Karma :

I have a 02 rs125 anyway when i first bought the bike mine did that for a fee weeks then it cleared up, starting it i had choke up till 40c then off then got on and pulled away at 55c
Also on a cold start giv it a few rev once the choke is off to help it clear itself not when choke is down unless you want a black plug Laughing