Clutch heats at startup to engage, when the skates skating......
What you think by local and general overheating?
you have a minimum time and maximum time to engage.
The mini is to avoid damaging the clutch by a violent impact when the blade start running
The maxi is precisely not to heat the clutch by a too long skating..
If by engaging normally = 1000t / min more than the idle and 50 ° more than the ide T4 you do not clutched in the maximum time, you must think about changing the clutch