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os 40 sr and 40 sf pistons

Old 02-09-2005, 06:43 AM
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Default os 40 sr and 40 sf pistons

Hi i have a 40 sr and a 40 sf engines and need to know where the arrow on the piston goes toward the port our the other side of port thank in advance .
Old 02-09-2005, 10:56 AM
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Default RE: os 40 sr and 40 sf pistons

The arrow on the top of O.S. Max two-stroke pistons always points towards the exhaust port.

The connecting rod also has proper direction. The bottom bushing has a chamfer on one side, and the other side is machined dead-flush with the side of the rod. The chamfered side goes towards the main bearing.

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