On Fri, 8 Aug 2008 09:10:55 +1000, "The Raven" wrote in
I'm one of those who doesn't bother.
I use some kind of synthetic fuel in all my engines. It's green.
15% nitro. Both two strokes and four strokes seem to do OK on
it, except for YS engines and the OS supercharged.
The price you pay for using castor oil in either kind of
engine is that you have to periodically remove the "varnish"
that builds up over time. The great benefit of castor is
that it will give you MUCH more protection against lean
runs, which can destroy an engine in a very short time.
You pays your money and makes your choice. :o)
I had a small Magnum (.15) that probably should have been
run on castor blend from day one. I think I cooked it,
not enough to melt anything but it just never ran nicely
after the first day at the field. I eventually traded
in with RJL for something else (I think I got $20 for it).
Regular OS engines, Thunder Tiger, GMS, and Saito all do
well on the green 15%. Or well enough for my purposes,
such as they are.