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Jet Setting

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I have a yz250f 2001 bored to 262 cc, flowed cylinderhead, DOMA exhaust header, K&N air filter, and a vortex x10 ignition, i only ride on tracks where hp are important, with long straights, i continuasly twist my trotthle till 13.000 RPM, change gear and wack the trotthle again. Here are my jet settings, butt i don't know if they are ideal for my way of riding ?

Main jet : 168

Just above the main jet : 42

Under to the left of the main :72

Leakjet 105

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What temps are you running in? Try going alittle bigger on the main. Then ride and see which part(s) of the powerband are still lacking. Each jet afects a different range in the powerband.

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Depending on your altitude/weather conditions your main jet should be at least 178 and maybe has high as a 185. If you're winding it out like that all the time, it's worth it for you to buy a 175, 178, 180, 182 and 185 main jet and try 'em out. Probably cost you less thatn $20.

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