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40:1 is the mixture of gas to 2 stroke motor oil (only)
Because of the way 2 stroke engines work. On a 4 stroke engine there are intake and exhaust valves in the head, and the crankcase is full of oil. On the intake stroke, the intake valve opens and the fuel-air mixture is sucked down into the cylinder. On a 2 stroke engine they put the fuel-air mixture into the crankcase. On the piston's down stroke, the bottom of the piston compresses the mixture. When the piston goes down far enough to open the inlet, the fuel-air mixture is squirted into the cylinder. If they put motor oil in the crankcase, you'd wind up squirting liquid oil into the cylinder. When the engine tried to "compress" the liquid oil, the incompressible liquid oil would break something.
Engine, not motor. It'll typically be a two stroke engine with one or two cylinders.
50:1
This engine should have a VRO pump and if it has been bypassed the mixture is 50:1
With a 2 stroke engine, you mix the oil with the gas. With a 4 stroke engine, there are separate tanks for the oil, and the gas.
I change my oil in a 7.3 power stroke every 3000 miles no motor problems 240,000 on motor
50:1
That'd be a motor with a 90.5 mm stroke and 69 mm bore.
if your scooter has a engine oil dip stick then it is a four stroke. if it has a oil tank that you have to put oil in then it is 2 stroke.
A 15 hp game fisher motor is most often a 2 stroke engine. However there can also be a 15 hp game fisher motor that is a 4 stroke as well.
straight fuel/4 stroke