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Actually, on a two stroke with a properly tuned pipe, what happens is you have a scavenging stage during the down stroke which aids in getting the new air fuel charge into the cylinder, this is aided by an expanding pipe. Next the pipe closes down, resulting in "return" wave of pressure to keep the new air fuel charge in the cylinder while the piston is coming back up until it rises over the exhaust port in the cylinder. If you really wanna know, I'll go deeper, but yeah, 2-strokes are completely different beasts, and to run right, the DO need "back pressure" but it still != restriction, however it can't happen without some CONstriction - hence, tuned pipe.
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