not to doubt any members' advice, and it just might be me, because I'm not the swiftest, but I had a hard time jetting carbs, especially 2 of them. It seemed hard for a while to get the air screws, mains, pilots, everything right. The kyt for me was understanding how a carb actually works. I always skipped over that in Clymers, and until I actually read it and understood it, I had a tought time. Understand it first, and then go from there.