Originally Posted by gunnerbuck
Great post, but a word of caution: On LC-4 engines with the Kokusan 4K-2 ignition it is recomended to use a flywheel holding device rather than the crank locking screw to tighten the flywheel nut. The 120 LBS torque required could damage the crank web. It's ok to use on the LC4s that only require 44lbs torque on the flywheels.
Thanks for making this clear. When I bought this bike it needed much more work done than this. Right now it runs almost perfectly but because it required work in general, I was not afraid to do this repair.
I did worry about locking the crankshaft in place using the bolt because it's on the other side of the engine. I looked for many ways of locking the crankshaft but I failed to unscrew the nut. After locking the crankshaft with the bolt it turned out that the flywheel nut wasn't that tight.
I tried to be careful putting it all back together and the bike runs great but I agree that it's always good to have the right tools.
Thanks for bringing it up here :)