Quote:

i need some help i have a 02 america with [Email]d@d[/Email] mufflers on it i have k n filter and the air box cut open and i have 140
mains and 2 shims on the needle the bike rund good but at 3000 rpm it is not smooth i was going to put 145 mains in it can any body help



140-145 seems too high to me. I haven't cut open my air box, but I'm running a UNI and NH bellmouth. I presently have 125 mains and 45 pilots, but may need to go to 128 mains since adding the bellmouth. Can't see needing higher for my set up that's been tested with numerous dyno runs. I plan to do another dyno run next month.

Even though higher throttle position is all mains. Having mains too large can negatively affect the middle range. Your pilots, mains, and needles do interact. My service dealer believes in having the smallest necessary main first, then alter the needles and pilots as needed. It shows up very clearly in dyno testing.

Bob 2005 America, 904cc - sold. 2014 Trophy SE.