compression stroke both valves are closed piston at top. intake stroke piston at top, intake just starting to open. exhaust stroke piston at bottom exhaust opening, closed at top intake starting to open . does this help? find top dead center . put an indicator on the piston top. bring piston near top to within a .100 . mark the balancer with scribe at pointer . reverse direction bring piston back to the same place on indicator, mark balancer with scribe. split the difference, that's the top dead center.
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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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