Quote Originally Posted by BajaRon View Post
So, there you have it folks. Short and sweet!
They actually may not have a good answer. Think about this. Besides the Ryker are there any gasoline engine powered mass produced motorcycles that have a transmission separate from the engine that are a significant portion of the market? If not then Amsoil probably hasn't spent any time determining what's best for such an engine and formulating an oil for it, so the safe answer is follow the manufacturer recommendation. They're not going to go out on a limb and say that the oil for a Lexus engine is perfectly suitable for a motorcycle engine if they haven't done any testing or analysis of it for that use.