Tomos Pre-Mix ratio

Dylan /

Sep 27, 2008 07:22PM

I need to know what the appropriate amount of oil to gas mixture is needed for a tomos streetmate with a 24 tooth rear sprocket and a bi-turbo exhaust. As of right now i am running without the oil pump hooked up so the only oil the engine is getting is directly pre-mix, i plan on hooking the oil pump up as soon as i get a new one, so if you could give me 2 ratios, one for my moped without a oil pump, and one for it when i put the oil pump on, it would be appreciated. if it makes any difference either, i am running a 56 jet

Tomos Pre-Mix ratio

Steve /

47steve

Sep 27, 2008 11:13PM

A lot of folks use 40:1, especially with aftermarket performance accessories. A stock Tomos A55 uses 50:1. A gallon has 128 ounces, so 128/50 = 2.6 oz of oil per gallon of gas at 50:1 (your oil pump should be putting about this much in).

At 40:1, 128/40 = 3.2 oz / gallon.

If you want to run your pump and add some pre-mix, you could use 3.2 - 2.6 = 0.6 oz per gallon to get about 40:1