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Jan Buchwald

I run my Brum on octane 95 with 1% two stroke oil, plus 6 drips a minute from the pump (also two stroke oil), but; two stroke oil is not just two stroke oil, there are different types, depending on the temperature of the engine. Too high, and you will have oil in your exhaust, too low, and you won’t have oiling in the top.
As I find the radiator only to be a little more than hand warm, and I can stand with the plugs in my bare hands, I use outboard two stroke oil, as this has a lower working temperature.