I ran big bore dirt bikes for years and I’ve tried quite a few oils, my favorite was Amsoil 100:1. When I’d tear down my top end, consistently I had no wear on the bore. If it weren’t for the fact that the piston skirts would crack if you leave a piston in too long, there was no reason to rebuild! No plug fouling, not much smoke, no splattering the guy behind me with oil, and no wear.... can’t beat it! I’d always break in with a natural oil on the first tank after rebuild, then Amsoil then on. I ran it in all of my 2 stroke motors, weed walkers, chain saws, Lawnboy mowers, everyth