Thanks for all the ideas and suggestions!
kim: it has never been running well, I bought the bike just a month ago.
GMP: I have checked the airboot, no restriction. Well i haven't checked the PV with engine running since i can't get it to run right now. I think the spark plug is really fouled.
iancp5
The needle valve is fine, checked for leak by blowing into the fuel inlet with valve closed. No leak.
Yes.. i'm actually thinking about putting a smaller main jet in. The previous owner used the bike in very cold climates so it might need smaller jet ..
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