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the explosions which are caused by the throttle being pushed down and the harder you push down the throttle the bigger the explosion ANSWER for single piston , power stroke force the piston to bdc . but during any other stroke , the inertia of the spinning crankshaft force the piston to tdc n bdc

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Q: What causes a piston in an engine to move?
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What causes fuel in the engine oil?

Bad piston rings. Get new engine.


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