I put a obeln needle in my 426 and left everything else stock. Runs good except for when I am in first gear and nail it, as the rpms get high it studders like I am hitting a rev limiter, which Im not. I tried putting in a 168 mj then a 170mj to try and get rid of it, also a 162mj, but didn't. From researching old posts I am confused about when putting in a yz needle. Should I put it on clip 4 and drop the main, or keep it on clip three with bigger mains, or is there a difference. I ride in Michigan around 1000 feet I think. Mods are in my signiture. Any help will be greatly apprecaited.