2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 86Get this manual

2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 86

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ENGINE (300) Cylinder Installation
Install the dowel pin(s)Install new base gasket onto the mating surface and position the Piston Support Block (PN 2870390) beneath the piston skirt to support