Good question Dennis and I usually ask myself the same question. The answer I gave myself is a star washer when bolting sheet metal and split washer when bolting steel brackets or cast parts. Also, star washers are less susceptible to breaking, so I believe a star washer is a better choice for the flywheel even though it goes against my rules above. Also, the star washer is thinner and for the flywheel this might be important for clearance issues.

With that said, I don't see the need for any type of lock washer if using thread locker.

Last edited by DavidF; 01/08/2014 9:16 PM.