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From a couple previous discussions….
Mumbles: “I do it on almost every motor I build. It gives peace of mind knowing the tapers on the crank and flywheel fit together properly.
Get yourself some Clover Leaf or other fine lapping or valve grinding compound and apply a thin coat onto the crank taper. Lower the flywheel and turn it back and forth. Lift the flywheel and turn it 90 degrees and repeat. Don’t turn it in circles! Keep doing this until the tapers are a dull gray over their length which is an indication of the amount of contact area. Cleaning and reapplying as you go is necessary and a final clean to remove any grit and oil film is mandatory.”
https://www.aomci.org/forums/topic/lapping-flywheel-to-crank-taper/