May 28, 201115 yr can anyone help me ! ive just bought a 2005 sy250 it starts fine hot or cold but it wont rev fully anything over half throtle and it just boggs down im not sure if the mixture screw is correct ive set it to 1 3/4 turns ?
May 28, 201115 yr Hi its unlikely that the idle mixture screw is connected with this issue, idle mixture affects mostly the lowest throttle openings. Sounds like its weak in the higher throttle opening ranges. Have listed my most likely guesses:- Fuel low or switched on?? (its been done) Blocked or missing main jet Incorrect Float height Incorrect needle clip position Blocked air filter missing air filter Does it get better or worse the warmer the bike gets? What is the effect of putting the choke on? Is the tickover erratic or reasonably stable? Is it better or worse when actualy riding the bike with some load? Dom
May 28, 201115 yr Author thanks for the reply, its the same all the time from reving it on the spot to riding it as soon as its in the higher range of revs it just gets really boggy, ive not tryed pulling the choke when riding, its the same if its cold or hot, theres no issues on tick over either? thanks Dan
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