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Top End Piston Kit 12.5:1 Compression - 77.00mm Bore (STD)


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  • SKU: PK1401
  • Manufacturer: Wiseco


  • Bore - Actual: 77.00mm
  • Bore - Oversize: STD
  • Compression Ratio - Actual: 12.5:1
  • Displacement: 250cc
  • Note: Nikasil Bore
  • Stroke: 53.6mm
  • Type: Piston Kit
  • UPC: 193564154156
    Includes The Following Components
  • 4882M07700 - Yamaha YZ/WR250F '05-11 12.5:1 CR 7700XU
  • 7700XU - 77.00 mm Ring Set .9 X .8 X 1.5mm
  • CW16 - 16mm Round Wire Locks - Set of Two
  • Ring - Set
  • S742 - PistonPin 16 x 41.91mm NonChromed SW
  • W5921 - TopEnd Gskt Kit Yamaha YZ/WR250F '01-13

  • Top End kit includes: piston, rings, wrist pin, clips, top end bearing (2 strokes), and gasket kit
  • Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Superbike, and more
  • Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy
  • High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power
Wiseco's complete top end Piston Kits are offered for nearly every popular motorcycle application. These kits contain everything you need to complete your rebuild the right way, the first time. High quality parts specifically chosen by us to match our forged pistons are included in this kit for easy one stop shopping.

This part fits the following


This product was added to our catalog on Tuesday 16 October, 2018.

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