with my set up i was all the way up to 160 mains.......mistake. you are probably lean in the mid...play with the needle clip.....richen it up a notch maybe. start with a plug chop to determine what mains you will need. then go from there. Houndog said it best to me over the phone......mains are wide open throttle....needle clip is just off idle to wide open throttle. took me a month or so to understand exactly what he said....now i totally understand.....me i got 130s and the needle clip 1 notch rich....perfect.