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October 26, 2019 at 5:25 pm
#185936
Well, I’m no expert on that Speeditwin model but if it were my motor, I’d run standard J/E TCW-3 mineral oil at the originally recommended ratio of 3/4 pint (12 oz) per gallon. With synthetic oil, maybe you could go to 16:1 (8 oz) but I’d defer that call to those with more experience on the Speeditwin. Even at the original factory recommendation ratio, modern TCW-3 oil will burn a lot cleaner with less smoke than the 1940s vintage outboard oils.
I agree, I would stick with the original mixing ratio instructions regardless of oil used….