Some manufacturers recommend a 1:25 ratio for their engines, so check your manual.This equates to 20 ml per liter (litre) or 2.6 fluid ounces (US) per gallon (US). In general, the oil-to-gas ratio for a two-stroke engine should be 1:50.Lubrication of two-stroke engines is effected by mixing two-stroke oil with gas before use.Two-stroke oil is designed to burn as cleanly as possible with the fuel. It contains additives which can contaminate the cylinder over time and also it can tar up the piston. The angle of this plate is varied as a user squeezes the trigger control.ĭon't use four-stroke motor oil in your engine. Some engines don't have a choke plate and vary the amount of spray leaving the jet. A throttle plate varies the amount of mixture reaching the engine to control power and speed.

It's either closed manually by a separate control lever or when the trigger/throttle control is set to the start position.

A choke plate at the intake of the carburetor increases the ratio of fuel in the air/fuel mixture when it is closed, to aid starting.

Finally, it is transferred to the cylinder where it is burnt to produce power.

The mixture flows out of the carburetor and into the crankcase through the intake manifold. (Paint spray guns used off a compressor work on the same principle).

This jet works exactly like the spray nozzle on a garden hose and a mist or spray of gas is created, which mixes with the airflow.

The drop in pressure causes fuel to be drawn through a jet into the air flowing through the venturi.

As air flows through the venturi, it increases in speed, and pressure drops below atmospheric.

This tube, about 1/2 to 3/4 inch in diameter on a small engine, has a narrowed section called the venturi.

Air is drawn by suction from the engine through a tube in the carburetor.

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