my speedfight will idle but when i rev it it dies?

olny done about 12000 miles not even that its was running fine i could have it down the aroads at over 80 there neveer been a problem befor

michael gooding
January 2008

i got a 100cc with a 120cc kit it is compltly tuned full accpet for the carb i just got a bigger jet in the carb it been fine for ages then it went wrong it runns the when i try to accerltate it will but then it bogs down and stalls or it just dies like theres no fule but i have cleaned the carb fully and i got a racing airfillter and i have changed that for A new one so im kinda stuck i think it could be the cdi u got any ideas i started it tooday it started first time but as soon as u pull off it dies

Michael gooding
January 2008

also m8, does the engine stall or just bog down, hw many miles have u done on it

chris
January 2008

hiya it can be a number of things m8, ive got 3 speedfight and rebuilt every1 of them!!! so i no exactly what im talking about with these bikes as people tell u many different things! if its idleing ok but wont rev and you havnt changed anything id suggest your rollers are worn. other thing cud be a very very dirty air filter or spark plug, jus clean it with petrol and then squeze filter in newspaper to soak petrol out. if you stil have the problem its a fuel problem either ur lean or rich because of w.e reason. check everythings tight round the air filter,carb,reed blok etc. what size jet are you using btw and wot CC???

chris
January 2008

ive dun that but still no luck i know alot about bikes im just stuck

Michael Gooding
January 2008

It sounds like you have a blockage in the carburettor jet(s) so I'd be taking the thing off for a thorough clean using carb cleaner (in aerosol) and compressed air to make a good job - and try again.

John
January 2008