Each Thai "Motocyc Mechanics" recommends 91 Benzine, even for latest models. So how about the Waves, especially the older ones? Does anybody knows since when one can put 91 Gasohol in the tank without damaging gaskets, sealing, lines etc?

Not too sure about the damage effect but I've tried gasohol in my little scooter and find it burns rather quickly and is terriblr for starting in the mornings. Although it is considerably cheaper I'm not convinced it's a kind of false economy.

I may possibly be wrong on this but it really seems that way when I tried it.

Don't use gasohol in it, really false economy, and will rot any rubber piece in the fuel supply area, economy is also far worse, only use benzine.