IGNITION TIMING FOR ANY TWO-STROKE ENGINE. by Bill Unger Advance = the amount of angular measurement that the spark happens before the piston reaches top dead center (TDC) on the power stroke. . Retard is less amount of advance. Internal combustion engines need to start the combustion fire before the piston reaches TDC because it…
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Categories: Engine Tuning / Ignition and Electrical / Maintanence / Modification / Performance