interesting fact, this engine with this cam has never kicked back on me like my raptor with a 107ss grind dose. it might be that the engine is just old and has been running on this set of rings for over 10 years but it doesn't smoke at all so its more likely that the cam I have just isn't that aggressive, I could be wrong on that but if this is the case it would be a good grind for a person who wants more power but still wants an engine that doesn't kick.