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Hi, I had the same answer from them-non commital, but would say suzuki recommend its correct sized/rated suzuki o-ring to fit a Honda-no. All I can say is that the dimensions and thickness are OK, and If it does not work for you, I will donate my home made solid copper gasket (5,000 miles and no trouble) to your cause, as I am rebuilding with the one from Japan. PS I have been told their piston rings also will fit with a little end clearance adjustment, and the 466cc kit will come in handy if the yoshi piston/ bores wear