Hold your finger over the plug hole and have someone to crank over the engine and see if you have good compression. You can hold your hand over the throat of the carburetor while cranking it over with another engine to see how much suction you have. You need good manifold vacuum to suck that fuel into the engine. Low suction could be valves not seating or rings worn or stuck or a worn cylinder. I use my garden tractor to crank the B&S 23 engine on my Toro mower since it has a lot of compression. Saves my arm. Hal
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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