J.E. Pistons 379443 FSR Ultra Series Piston Kit - 3.00mm Oversize to 84.00mm, 13.5:1 Compression electrical-gauges-components-gear-indicator-gauges 1989-1991 Polaris Trail Boss 250

1989-1991 Polaris Trail Boss 250 2x4

Black Ops or Contrast Cut finish

The Moose provides warmth without weighing you down

0L) Performance Rod Bearing Set - Size STDX

J.E. Pistons 379443 FSR Ultra Series Piston Kit - 3.00mm Oversize to 84.00mm, 13.5:1 Compression electrical-gauges-components-gear-indicator-gauges 1989-1991 Polaris Trail Boss 250Bore: 84. 00mm Compression: 13. 5: 1 Compression Sizing: 3. 00mm Oversize Displacement: 1441cc. Bore: 84mm. Oversize: +3mm . Compression ratio: 13. 5: 1. In house forging has allowed JE to develop proprietary Aligned Grain Flow Technology forging technology that directs the grain flow of the aluminum to flow around critical areas of the piston, increasing strength. Lateral gas ports channel combustion gases to the back of the top ring groove, which