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How can i fix my brothers japanese py90?

I bought this bike about a month ago and it started 1st or 2nd time regularly up until now. when i start it now it ticks over for a couple of seconds and cuts out........ please help?
Joseph Collins, December 2007
have u tried putting the choke on becouse its probably freezing

aaron morris, January 2009
yep sounds like a few problem

ive had trouble with vibration turning the screw, so if possible find the correct setting and somehow fix it there (special locktite or other temporary adhesive)

usually 1 1/2 turns ish anticlockwise from fully in position

or try adjusting the idle speed, could be choke ? lots of things really ,

get it started revi it up and get someone to spray carb cleaner into the carb , this should clear any crap

jase, December 2007
u need to open up ur timing screw on ur carb to let more petrol in and if that dosent solve it just kcik the sh*t out of it that usualy works 4 me lol

shaun, December 2007