well the clutchbell, when idling, isnt meant to move, its only when you rev the car and the clutch engages, its when the clutchbell is meant to move, and drive the gears...
But in all seriousness.. If your engine is overheating like 3 times per tank of fuel.. Likely chance is that your engine is now naffed...
Obviouosly this isnt always the case.. But overheating is a big killer of compression, and if your overheating that amount each time, then im convinced there premiture wear on the piston and sleve...
So what id do is:
Pull the engine out the rc
* Strip it down, and i mean everything, flywheel, clutch, engine head off, piston and sleve out, crankshaft out, carb off etc etc.
* Put the crankshaft back in gently and check for excessive play along the way
* Visually check the bearings.. (one behind the flywheel, and one just inside the engine
If bearings seam fine, check piston and sleve pinch.. When you slide the piston in the sleve, there should be resistance up towards the top of the sleve.. about 6mm from the top roughly is where your meant to get full pinch.. If thats fine then move on to the next step.... If there is no pinch.. Your piston n sleve are fried..
* If piston and sleve are good, Put it back in the engine,
* Fit flywheel on, checking for play along the way.. Also refit clutch shoes, clutch bell etc....
* Seal and fit the carb.. Seal it with High temperature Engine Gasket, fit it in the engine, and leave it 24hours to cure and seal fully
* Fit one way bearing
* Seal and fit back plate (seal the edges properly with high temp gasket again)
* Set carb to factory settings, (if you dont know them, search around the net for them to your specific brand engine)
* Remove carb needles (remembering stock tune settings), seal all the needles up with Team associated green slime and refit them back in and reset factory tune settings..
* Leave engine 24 hours for gasket sealant to cure etc...
I know this seams like a bit and long job, But trust me.. It enables you to service every part of the engine, checking one thing at a time.. And while your fitting it all back together, your sealing the engine from air leaks,, (sealing the engines are recommended on engines), i seal my engines up when they are brand new, and before i even use them the first time, so i know i havent got to worry about air leaks later on....
Will all these checks etc, your illiminating the potential problem one by one.. Until your engine has no choice but to run smoothly
i really hoped this helped...