Pablo,
If you are going to do a 50:50 ratio, I highly recommend 3 oz total oil per gallon or you risk a lot of varnish build up on the engine.

Castor's almost magical properties are complement synthetic oil very well and in only small doses. More is not necessarily better. 1 oz castor mixed with 3 oz of Amsoil per gallon would be PERFECT and make less of a mess on the plug and exhaust tip.

The use of roller bearings really negates the need for a rich oil mixture and I'll even step out on a limp and say that 50:1 ratio with AMSOIL would be ok provided there is no risk of overheating the enigne. Castor really shines in temperatures that would cook any other conventional and nonconventional oil because it forms a dry film lubricant when it "cooks off".


I love the smell of burning the bean its something I picked up from model airplane flying....

Thanks for the posting and let us know how it goes. BTW, castor is compatible with almost all oils. It has compatibility issues in fuels that contain a high level of nitromethane.

BTW, I wish AMSOIL made a castor blended oil like other brands.