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Drew said:
smiley_666 said:
it is one complete revolution of the crankshaft. usually measured by the number of sparks per an amount of time. i.e. 10 revolutions/ second, 10 sparks per second (on wasted spark ing system, 5 for a conventional ign system) = 6000 RPM.
600 you mean yeah?

In a CBR250 at 18000RPM each piston is going up and down 300 times a second

That's crazy!
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