I’ve got 3 C70s. I love all three equally but one is a problem child. It’s a newer acquired 1980 with 2000 miles and always garaged. I swapped tires and tubes, cleaned the carb repeatedly. Installed new battery, points, condensor and even coil since it was cracked. I’ve adjusted the valves and timed the ignition and cam chain. After not helping I tested compression at 70 lbs. So I swapped jug, piston rings and all seals with OEM. It has a couple issues. It idles weak until it craps out after a couple minutes but pulls like a mofo with throttle. Why the heck can’t I get it to idle consitently? I’ve even swapped out to a dratv knock-off carb with the same results. The other issue is the tranny. It clunks from gear to gear nearly snapping my neck in doing so. I tried to adjust the clutch but no good so I swapped the discs and seals which showed minimal wear and I still have terrible shifting luck with it. Any thoughts would be appreciated. My next thought is to pull the right side cover again and go looking for broken or bent parts.