It makes that much power because its an almost continuous firing cycle much like the 2 stroke (Also why the fuel consumption is high as well) unlike a four stroke...
Four Stroke
1. Compression (Upward)
2. Firing (Downard) - Power Stroke
3. Exhaust (Upward)
4. Intake (Downard)
Two Stroke
1. Compression + Intake (at the same time)
2. Firing - Power Stroke
3. Exhaust + Filling of cylinder with fresh charge...
Rotary
1. Intake + Compression + Exhaust + Power stroke all at the same time...LOL
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