Quote:
Originally Posted by renault_megane_dci
Erratic running at low rpm is caused by air flow reversion. It is caused by too much overlap and aggravated by too low velocity in the runners.
So, low rpm operation can be improved through less overlap (free) but might require cam regrind towards less duration (can prove expensive).
Smaller carbs can help in this matter (check Suzuki Inazuma 750 vs GSX-F 750)
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Or one can just move the position of the stock intake cam. Will shift the powerband a bit, but most of the horsepower should be there. Bike cams are naturally low volumetric efficiency at low speed, they just have too much overlap to be economical. Bike compression ratios are pretty high so I don't know how worthwhile cam regrinding would be.
EFI would help though...