Is a 172 main in my 05 yz250 going to hurt it down here in AZ? Alot of people are telling me it is, but i look one here and it seems alot of people are running the 172 or lower? Is it ok?
if you are running good fuel, you can lean it even more. listen out for detonation when you have the throttle pulled all the way to the stop. if its not detonating under a heavy load, then you are OK.
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