Quote:
Originally Posted by XLsior
A plug read is a definite good start..
Shimming the needle with make it richer which will likely perform worse...
I would start by smaller incremental pilot jetting...
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Lean running midrange could easily cause bog due to insufficient fuel, needle not lifting to let enough fuel in. A plug read will help. If it isn't sooty, LIFT the needle.
Startling point is whether the carb and jetting is OEM. And are you getting lots of popping/backfiring on deceleration - this means lean, not rich.
Is this the original carb???