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Clutch:
Adjustment of clutch levers; replacing bushing in bars lever.
Fixing potential cable breakage...& new cable problems.
Lubrication of clutch splines (input splines of transmission).
Preventing broken ears at transmission clutch lever.
Clutch carrier/flywheel, bolts, crankshaft end play.
Throw-out bearing & pushrod.
Crankshaft end play spacers.
1981 Clutch/carrier problems.
STUCK CLUTCH.

© Copyright, 2007, 2012, 2014, 2017, R. Fleischer
http://bmwmotorcycletech.info/clutch.htm
Article 60, subsection 9

Also see http://bmwmotorcycletech.info/inputsplinesthrowout.htm

Warning!   Warning!!   WARNING!!!
Under no circumstance should the flywheel or clutch carrier on any model be removed without first blocking the crankshaft from moving forward!! http://bmwmotorcycletech.info/flywheelremovalwarning.htm

You must block the crankshaft! Do not take a chance on serious damage to the engine!

Many have removed & replaced an Airhead flywheel or clutch carrier without blocking the crankshaft with no problems. My advice, very strongly given here, is to take a minor amount of time & make & use at least my simple crankshaft blocking tool. If you do not use some sort of crankshaft blocking tool, & your crankshaft should happen to move forward enough (does not take much pressure nor does it have to move far!) to have one or both of the thrust washers fall off their pins, you could cause very serious damage as you attach & bolt-up the flywheel or clutch carrier. Even if you do not cause serious damage, if the forward thrust washer drops, you may be unable to get it back on its pins without a very considerable amount of work. Do not take a chance!

Since it is a must, in my opinion, to mechanically block the crankshaft from moving forward at any time during the process of removing or replacing a flywheel (or clutch carrier as it is called on 1981+ including some 1980 models), you need to know how to best do that.  

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