TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM - Dune Goons
TRX400EX 85mm Top End Kit WSM - Dune Goons
TRX400EX Engine Rebuild Kit 1999–2004 | Wrench Rabbit WR101 - 192 - Dune Goons
TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM - Dune Goons
TRX400EX 85mm Top End Kit WSM - Dune Goons
TRX400EX Engine Rebuild Kit 1999–2004 | Wrench Rabbit WR101 - 192 - Dune Goons
TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM
TRX400EX 85mm Top End Kit WSM

TRX400EX 85mm Top End Kit WSM

  • Ships next business day
  • 30-day hassle-free returns
  • Call us: 541-668-7503
  • Secure checkout — Pay in 4 available
$289.99
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🔧 Honda TRX400EX 85mm Top End Rebuild Kit – Dune Goons | Most Affordable New Cylinder Kit

Looking to rebuild your 400EX top end without spending a fortune? 🛠️ This Dune Goons 85mm Top End Kit is the most affordable complete rebuild option with a brand-new USA-made cylinder. Whether you're chasing reliability or performance, this kit delivers everything you need to get back on the trail fast — without cutting corners.

✅ What’s Included

  • Dune Goons 85mm Cylinder – Precision-machined

  • WSM Piston Kit (0903-1351 / 54-228-10) - 10:1 pump gas piston

    • Forged piston, rings, pin, and clips

  • WSM Complete Gasket Kit

    • Head, base, intake, exhaust, and oil seals

  • Bonus - WSM Oil filter included.

📦 Fitment

  • 1999–2008 Honda TRX400EX

  • 2012–2014 Honda TRX400X

  • Also fits earlier models with 85mm standard bore setup

🛡️ Warranty Info

All Dune Goons cylinders are hand-inspected and backed by a 6-month limited warranty against manufacturing defects. WSM piston and gasket components are covered under their original manufacturer’s terms.

📦 Shipping Information

In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.

Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.

Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.

Questions? Contact us, we respond within 24 hours.

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