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MCB Stage-1 Top End Rebuild Kit Yamaha YZ 85 2002-2018

Wossner /Pro-x Top End Piston Rebuild Kit

MCB Stage-1 Top-End Rebuild Kit for 2002-2018 Yamaha YZ85 . This engine rebuild kit includes a Wossner Premium Forged Piston /Pin 8104DA, Genuine Riken rings, clips and Top-End Gasket Kit. Everything you need to service your MX Top-End.
You may optionally choose a Pro-X (CAST) piston below.

Need a cylinder? Click on suggestion below.
Pricing: $139.95

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MCB uses Wössner pistons exclusively in all our MX/Off road kits. Germany's finest aftermarket forged piston manufacturer with over 25 years of experience in the Powersports / racing industry.

Wössner is currently the piston of choice for Monster Energy Star Yamaha Racing Team

Pro X pistons are the premier cast piston made from a specialized low-expansion, low-friction aluminum alloy, commonly used by OEM engine manufacturers to give the piston an incredibly low co-efficient of friction.

Prox Racing Parts is official technical sponsor of the Monster Energy Pro Circuit Kawasaki team


  • 23430960
  • 23430960
  • Yamaha
  • New

Shipping Information

  • Item Requires Shipping
  • 4.0 lbs.
  • W12.0000” x H9.0000” x L6.0000”

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