.21 xm piston

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08-15-2007, 04:17 PM

kb guy

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.21 xm piston

what is the purpose of the large holes in the piston. weight reduction? CARTER

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08-16-2007, 09:44 AM

Bax

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RE: .21 xm piston

The holes in the side of the piston help with fuel/air transfer from the lower-end of the engine into the cylinder. You'll see that they line up with the transfer ports.

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