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1989 Yamaha pw80 won't idle

13K views 8 replies 2 participants last post by  novascroller  
#1 ·
hi there, I have an '89 pw 80 that won't idle with the choke on or off. the carb has been replaced (the old one was filthy and a new one was $20). it doesn't have any air leaks on the intake side of the carb. any suggestions as to where to look next? thanks.
 
#2 ·
How long has it been running like this? is the oil injector hooked up or bypassed? fresh gas? whats the spark plug look like? do you have 2t oil in it? is it smoking?

If oil injected bikes sit too long, the oil will accumulate and take a while to clear out.
 
#9 ·
ok, so i fixed the gas leaking issue by using the floats from the original carb in the replacement carb. i still can't seem to get the idle issue fixed, it seems to have problem staying at a given rpm. adjusting the pilot air screw has no effect on the idle speed. if you adjust the idle air screw all the way in it'll idle too quickly so i'll loosen it up a bit and the idle will just slow down and stall unless i keep blipping the throttle. any suggestions?