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Old November 3rd, 2011, 05:14 PM   #21
Momaru
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Name: Paul
Location: Roanoke, VA
Join Date: Jun 2009

Motorcycle(s): 2008 Candy Plasma Blue 250R

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Different jets focus on different sections of the power/throttle band. If you're just throwing on a slip-on exhaust, you can probably get away with very little rejetting because you'll see very little benefit other than a change in how the bike sounds. If you're doing a full system exhaust replacement, you'll want to retune your pilot screws (no new parts needed), your needles (adjustable with washers of the right size if you don't wanna buy the kit) and the mains (can be purchased individually for ~$2/jet).

Technically speaking, you can get all the jet tuning done without pulling the carb. But adjusting the needles will require pulling the gas tank.

There's a bunch of threads on the forum for tuning etc, might try the 'jetting database' for a start
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