ANSWERS: 2
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How old is this motor? If it is new enough to be a 4-stroke (only readily available for about the last 10 years) it will have an i.d. plate that you could check up on from the manufacturers website. If it is a pretty old unit, it is 99.9% that it's a 2-stroke. If you add 2-cycle oil to a 4-cycle engine's fuel it would still run, but poorly. If you run a 2-cycle engine without mixing oil with the fuel, it would seize the engine. Mix a gallon at 50:1 and run the motor with it if you are still unsure.
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A four stroke motor has an oil sump that is filled with oil. A two stroke motor has no oil sump and oil is added to the fuel, usually petrol. Regardless of the number of cylinders.
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