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You can determine if you're on the compression or exhaust stroke by observing the position of the piston and the alignment of the crankshaft. When the piston is at the top dead center (TDC) and both valves are closed, it's the compression stroke. Conversely, if the piston is moving down from TDC and the exhaust valve is open, then it's the exhaust stroke. Additionally, you can feel for air pressure at the spark plug hole during the compression stroke.

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1mo ago

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