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"Two stroke engines rely on effective scavenging in order to operate correctly. This clears out the combustion exhaust gases from the previous cycle and allows refilling with a clean mix of air and fuel. If scavenging falters, the mixture of unburnable exhaust gas with the new mixture may...

Yeah, four stroking, that's what I meant. :|:

Running the saw at wide open throttle, without any load on the motor, should produce a "four-stroke" sound when properly tuned. What you are describing is probably normal.