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Originally Posted by atvconnection
It just so happens we’ve performed very similar modifications to a 2004 Yamaha Warrior several years back. If memory serves we had actually gone up to a 150 from a 147.5 main jet before being satisfied with the results (and depending upon elevation, we have heard of some tuners actually going up to 155 without issue). Yes as you have noticed, the result of the modifications was a lean condition.
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