The thicker the oil the more "accelerator pump" behavior. Slowing down the
piston causes the mixture to richen on opening the throttle. The thinnest oil
that does not stumble on acceleration is best. As to me, I use 10-40, same as
the engine. If you want to experiment try motorcycle fork oil. Should be able
to
get it in lots of different weights.
keith
> I've found little difference
> between Marvel mystery oil, ATF, 10wt and 30wt. As long as
> there's 'something' in there. (Well, axle grease would probably be
> a bad idea :-) ).
>
> Keith, what say you?
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