Originally Posted by RiPPeN302

Quick tuning question. Is there any tuning differences between a Plus4 carb and say an OS based engine?
I'm finding it hard to find the sweet spot between a lean bog LSN and to rich LSN with big idle gap causing a really high 2 stage idle from WOT to stop. Been doing adjustments down to 1/16th turn. What am I doing wrong?

I have a spare 21J carb off an OS Speed. Anyone run that carb on a Novarossi?

Thanks,