I have used Honda/Yamabond and RTV on many bikes without a problem. Dirt bike riding we used the stuff all the time, talk about time constraints. When you have 12 hours to get a bike ready it gets gooped up, no screwing around, this bike is moving tomorrow. Never had an engine issue due to a sealant, 2 or 4 stroke. The trick is, as others have stated, to use very little. I like to explain it as string. You only need a little string that could hold a kite, nothing more. If you think you aren't putting enough on, you probably have it right.