It's going to be trial and error. Run it the way you have it and see how things are. But personally I would probably buy jets in size 90 and 120. I have a Mac and harley muffler on my cx500 and that was one combo I used. And all the carbs I have but 1 set have been gone through by Larry. Heck I even have an extra cx500 set in the other room that Larry did.