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The proven solution to the piston failure that is common in the Polaris 800 engine caused by the piston clearance in the cylinder being loose and allowing the pistons to rock in the cylinder bore. With that rock, the pistons scrape the cylinder wall and remove the oil film from the cylinder wall. As the pistons continue to scrape they begin to cause damage to the pistons, rings, and the cylinder. Eventually, the engine will begin to loose compression and bog, and as it worsens it will begin to idle poorly and not switch into reverse. The engine failure can take time and show all of these signs or can go quickly without notice.
This kit is designed to eliminate the piston slap issue. By adding a cylinder shim it allows us to increase the height of the piston which dramatically reduces the piston’s tendency to rock in the cylinder bore; also tightens up the clearance in the cylinder, and by so doing increases the durability of the 800 motor, while increasing compression thus increasing power. Due to the added case volume, you will see a 2-3 HP gain!
This kit includes: pistons, rings, circlips, wristpins, cylinder bolts, cylinder spacer, longer alignment pins, top end bearings, & 1 base gasket. Needle bearings not included. A top end gasket set will be required (sold separately). Please call for replacement pistons, stock pistons will not fit.
Bore Size - Piston | 85mm |
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Mfg. Part Number | SKC1004 |