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did you do anything on the air filter side, ie airbox elimination, freer flowing air filter, etc?

if so, then definately rejet.

If you just added the pipes then you probably need to rejet too!

If it's just running a little lean it may pop a little bit or take a long time to warm up. If it's running way lean it may run like total*****.

Worst case scenario is you'll blow a piston b/c a lean mix runs hotter than rich/correct mixture.

so yes, rejet. The bike comes lean from the factory anyway.

You'll probably need to turn the idle mixture screw out a 1/4-1/2 turn and go up on the mains. You mught consider adding a shim to the needles too.

Dinqua's carb tuning advice!
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