A friend of mine has a very nicely fettled flying squirrel which he runs with castor oil. I didn’t know that modern castor oil is a far cry from the old stuff and apparently doesn’t gum up etc. What do the members here think? Someone else told me that it will mix readily with other synthetic two stroke oils, is that so?
I run mine with R40, both the engine and gearbox.
The old stuff could gel to an extent and certainly would if it came into contact with mineral oil, but the more modern oil seems fine generally if used neat.
Its main attribute is its very clingy nature which protects far better than the newfangled stuff.
I don’t think I like the idea of mixing it with other oils however, I would go for one or the other —
I agree with Oldguy,
Never mix castor oil with other oils unless you want instant sludge clogging everything up. Why use castor oil, is it for the aroma? Modern two stroke oils are made to stand much higher stress levels than in a much lower revving Scott engine. My bike gets quite a belting at times, no smoke and has never had lubrication problems since I bought it 1997.
Caster all the way for me.
After running model aircraft engines for years without any fault on caster based fuel I changed to modern oils and at the same nitro content. After 1 year I had to replace several bearings and every year after it was the same. I returned to caster based and have not had a failure since. Just ask Roger Moss about his racer when the late Paul Dobbs ran it on modern oils. By the way my bike has little smoke during normal running with Silkolene Casterine.
Wishing Roger the speediest recovery and good health.
MFO 163 has just completed 1280 miles of very hard riding in the Picos de Europa rally on Millers Oils CM2T goes under the name of Pistoneze. No smoke and no problems. I guess you take your choice
Thanks for the interesting answers, chaps. My Scott certainly gets ridden hard at times and the only problems it has ever had have not been down to any particular oil. I use any synthetic two stroke available when I need it. I ride with mates quite a lot and personally find the whiff of 2-stroke unpleasant. For their sake I thought I would give the castor based stuff a go (so yes it is for the aroma) but don’t know if I can be bothered get all the synthetic out of the engine to do so 🙁