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Discussion Starter · #1 ·
What is the main jet size on a stock yfz450? I have noticed that i am running "flat" at the last 1/8th of the
throttle and would like to go up a jet size or two.

Or am I running up against the rev limiter and should leave the main jet alone?

Thanks
 

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stock main is 158
the quads come lean from the factory so i doubt your hitting the rev limiter
yes ,jet up!!!
 

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Originally posted by V-Quad@Aug 22 2003, 10:53 AM
stock main is 158
the quads come lean from the factory so i doubt your hitting the rev limiter
yes ,jet up!!!
I thought they came rich. Don't they jet them for sea level, so the more above sea level you are the richer it is?? Maybe I'm wrong, help me out here.
 
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