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'08 YZ250F Jetting?

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Hey guys. Just picked up my new bike. I was wondering if there is any more power left in these things or is it pretty much right on from the factory? thanks!

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Yes i have. Just rode today. The bike wants to stumble and cough down low. Up top it pulls fine. Could this just mean the needle needs raised?

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o-ring mod and a 40 leak jet.

sorry i forgot to mention that its in the 30s here. im sure the bike is jetted for warmer weather which is probaly the reason it is running like this. But should i put the 40 leak jet in? should i leave it in even after it warms up? and what is the o ring mod? thanks!

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