Applies to 2 stroke engines only. Our bikes here are all 4 stroke (mr honda didn't care for 2 strokes). Our bikes can burn valves and such with jetting issues, 2 strokes are sensitive to air leaks and jetting, they literally can break Pistons and sieze up from getting too lean (too much air per volume of air is lean, vice versa is rich) and detonation. Whole different animal that I am far too familiar with
