If your mostly driving hard pack trails and not much sand then I suggest when doing the top end do the 58.5 or 59mm bore, its a drop in. Also an A-12 cam with 12gm rollers and yellow torque spring. Naturally you will want to scrap the air box for a UNI or K&N air filter. If you have the older model with a 1/2 id tail stub you will want to open that up to a 1 1/4" then if you are at or slightly above sea level a 128-130 main jet.
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