Engine sat for years after being run very little. Finally got around to working on my 62 Corvette shifter and would not idle down when hot. Tore it down replaced case gasket, base gasket was bad, mag side seal had blown out so replaced both with TCM double lip seals. 5mm just barely clears magnet and fit kinda tight, the stock one could be taken in and out with one finger. Now I have the opposite problem once it warms up the idle screw aint enough gotta raise the slide a bit more with the cable adjusters. Its also now topping out at 26mph when I was in low 30's with the air leak and slipping clutch. Bigger jet and raising the needle doesn't help just makes it 4 stroke like normal. No filter no difference, choke kills it and slow closing it doesn't change the idle either. It just acts like the NT aint big enough and the only mod is my old SBP expansion chamber and good wire and boot. Might have to try swapping the NT with the RT I have on the predator. When I had it on the 2stroke couldn't really tune the mid range it was rich even with the air leak and the smallest jet I have a 60. I dread trying to deal with the old CNS, I got no jets for it anyway though it didn't do to bad on the old pre Bikeberry real FlyingHorse 49cc once I put an NT needle in it. I'm stumped. Oh and before someone asks I don't have the CNS needle in the NT, took that needle from my first NT that wouldn't stay on an intake without tightening it so much that the slide would stick.