Originally Posted by m2cracing

A problem that we have ran across with this problem is:
the wrong taper on the collet.
And brass collets do wear out.
If it ever spins, then you can have the problems you are describing.

the losi uses a 10 degree tapered collet. it is 6 mm long (.236)
I am not sure what the tekno collet is but odds are that they used the same
collet set up as the flywheels are similar.
A collet should extend out of the tapered hole about 1.5 mm.
If it fits down flush to the back of the flywheel then it is not the correct collet.
next:
mugen uses a 7 degree tapered collet and is about 7 mm long.
These will not interchange.
All engine suppliers use the same basic length of crank shaft from
the end of the crank to the bearing about 29.5 mm (1.261)
this is what we who make aftermarket flywheels systems use as a
standard for our products.
So, you can basicially use about any clutch system out there, but make
sure you have all the correct components for that clutch.
as far as clutch bell go, most will interchange with the after market
flywheel kits to my knowledge.
A proper clutch set should be:
when everything is assembled the outer bearing should be at the end of
the crank shaft + or - about .1 mm.
If you are a bit shy you can use a 4.9 x 3.01 shims (ofna part no. 10210)
I think,on between the bearing and
the clutch bell. this will keep the bearing off the race of the bearing. and allow
the proper play clutch bell.
if you continue to have problems
pm me and I will try to help.
hope this helps