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Common sense says don't go below 0 rpm or above 12K rpm


I'm assuming he is talking about mean piston speed which increases a stroke increases.

From the 2 stroke tuners handbook, the normal max MPS is around 4000 ft/minute

MPS=.166*stroke (inches)*RPM   which puts the normal max rpm for a +7mm around 10,500.

BUT, Not very many people get on here talking about snapping rods and over that RPM you are in over-rev and should shift anyways.

Basically don't be a dumbass and rev it to 12K for 5 minutes at a time.

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