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Message: [QUOTE="SHWANTZ34, post: 1066186, member: 70084"] HI ! I have some pinging problem with my 03 KX-250. The bike is completely stock, and i'm pretty sure that i have all the stock original jetting. I just bought it a few weeks ago, and everathing , including the tire were original, and praticly new. The guys was using it to train is peewee kids. Ok now for my pining problem.i use Esso Supreme 91 Octane mix with motul 800 mixe32:1 , Same gas that i used in my other bike ( Cr-250 01 ) . My Cr works very good with that fuel. I try to close the mixture screw half a turn to 1 turn it help a bit , but its not perfect.I would like to know if somebody with the same bike have had this problem , and what is the receipe to meke it work ok.I would like to use something as standard as possible , if possible no race fuel or a mix of it with super pump fuel. I'm no millionaire, and used the bike on racetrack but only for fun.If you have any sugestion please let me know. What is the minimum Octane riquirement, any jetting indication, like delivered to lean from factory etc.. The jetting seems to be ok the plug have a good light brown color. P.S I' M new with 2 stroke bike, help me if you can. . [/QUOTE]