Originally Posted by Anthoop

Lapping is an option for racers to use notoriously tight engines without time consumed....it will reduce life of the piston/liner....might make the rod/crank/bearings last longer....
Having a totally round piston on a two stroke is wrong due to the piston seeing such varying temperatures in differrrent areas....you can only make the piston and liner fit together properly by bedding them im together under running conditions...
Back along there were many engines that would take a gaallon and more of fuel before they would free up.....hence the short cut for racers with more money than patience.