Sorry to bother you but was needing some friendly advice. I have an 01 660 that needs a carb rebuild kit due to some issues. I figured while that was being done that would be the time to do any jet type work that might need to be done. The wheeler has a pro circuit t4 slip on and a k&n filter(the flat one that fits on the air box) with no lid on the air box(as far as I know that is the only things done to it). I bought it like this and just now getting around to getting things fixed. I don't know if you recommend new jets and so forth but thought I would get your opinion. I'm suppose to drop the wheeler off this week to get the work done, so before I dropped it off I thought I would see what you would advise. Thanks for your time.