Blade revs fast, doesnt get up to speed before it binds and smokes.

I feel you may have a spring that is on the carb that has broken or come off. The thing the spring goes on is just floating back and forth as the engine revs making it rev up and down. I had that happen and had to get a new spring. this spring should be hooked to the control section of the carb.

Leaky injector

overheats at idle only are typically the fan system. Cars use the fan to pull air across the radiator for cooling. Any speed over 10 mph there is more than enough natural wind to do this without a fan. If the problem immediately goes away when you start moving, it is probably a malfunction or issue with the fan. I have on more than 1 occaision had a customer tell me they had the fan replaced and car was still overheating, and it ended up thje fan was spinning backwards or not turning on because of a fuse or relay issue.

If it doesnt cool down fully once speed is above 20mph for more than 30 seconds, there may be other issues like plugged radiator or weak water pump impellars. water pump is a fan that moves water instead of the air. if the blades wear, they still kinda work, but at idle they work poorly because the broken blades only move a little air at low speed, rev the engine up, they spin faster and work better. If the fan is functioning OK (Turns on and off by itself) and car still runs warmer at idle than at rev, water pump may be worth investigation.

run fault codes and look for a air temp sensor fault

I would try cleaning the throttle valve body and also the automatic idle speed control valve mounted to the throttle body, this is a common symptom of a dirty throttle valve and idle speed control valve. Use a product called "CRC" Throttle valve cleaner, run the engine and spray it into the air intake of the engine with the supply hose removed, hold the throttle up while you do this as it will try to stall, use up about half the can and then shut it down and disconnect the battery NEGATIVE cable for 5 min's to reset the system learned strategy, drive it for a few days and see if this corrects the problem.

checm fuse box for loose wire connection accelerating will cause it to push to many ampps and blow fuse make sure fuse prongs are nor loose

sounds like you smoked a belt check your blade tensioner belt, possibly an idler pulley bearing or your belt jumped off pulley, not getting right tension on belt for blade

Check to see if the engine is running hot. This will happen when the engine runs hot. After it has cooled down, then it starts back up until it runs too hot again. If that's the case it could be the thermostat.

I guess youwillhaveto adjust the clutch cable so as to open the plates more at the pressure plates to let the clutch plate rotate freely instead of binding thus the low rpm.
Hope this helps!

I replaced the control board on mine, and that seemed to resolve the issue