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I put on a bomber exhaust, k&n replacement air filter and a bellmouth on the air intake. air box not drilled. I have an 04 triumph america. I can't seem to get it to not run lean the plugs are running white and it's breaking down at the top end . I am running 3 turns on the air screw, 155 main jets, 45 pilot jets, and stock needles with 2 shims. any ideas why this bike won't richen up.

mikej
 

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I would also suspect an air leak or some strange fuel restriction. Main jets seem rather large to be running lean with the air box still in place. Quick check on a jet calculator returns something in the 125 range.
 
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