Bill,

I have been running O.S. 2-stroke engines from last 15 years with Homemade fuel 20 % pure caster Oil and 80 % methnol. I never ever had any problems with the new engines that I broke-in by myself.

Having strictly a 2-stroke person and no experiance of 4-strokes my question is this

Is necessary to use Nitro-based fuel for O.S. 4- stroke enignes for proper running like FS 90 and 120?

Since Nitro-methane is not available in my country at an affordable rate so is there any substitute for it and what do you say about Nitro benzene?

How would a 4-stroke run on pure Caster oil / Methnol based fuel?

Thanks