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OS 91FX Piston orientation.

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OS 91FX Piston orientation.

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Old 02-03-2014, 05:33 PM
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OldRookie
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Default OS 91FX Piston orientation.
I disassembled my 91FX to replace the bearings, After everything was dissembled, I was cleaning up the parts and there was no arrow on top of the piston. Which way should it go...With the thicker boss facing front or back?

Greg
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Old 02-04-2014, 07:25 AM
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You install the piston so that the ring gap is on a web between ports. That means that the pin is usually towards the opposite side from the exhaust port.
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Old 02-05-2014, 03:48 AM
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Thanks Bax,

That works. It puts the wider wrist pin boss to the front.

Greg
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