Re: flywheel key
Be very careful with the lapping compound. Its a valve grinding type compound that you put on the tapered part of the crank and then put the flywheel on without a key. Then you turn it back and forth to "seat" it in. The process removes metal from the taper and the flywheel.<br /><br />I've seen guys do it so much that the flywheel no longer is an interference fit to the crank taper but rests on the shoulder below the taper. <br /><br />The two tapers are supposed to be an interference fit. Just be careful. Also make sure the bottom of the nut is flat. No burrs. <br /><br />A good nut, the right key (make sure you havent been using the wrong one accidentily) and the correct torque is the trick. Remember, all the key does it position the flywheel. The tapered fit is what holds it. If it gets loose for any reason the key will shear.
