Vertex WR101-031 Engine Rebuild Kit – TRX450R (2004–2005)
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Vertex Complete Engine Rebuild Kit – Honda TRX450R (2004–2005) (WR101-031 / 0903-0971)
Description
The Vertex WR101-031 Engine Rebuild Kit (0903-0971) is a complete top and bottom end rebuild package designed specifically for the 2004–2005 Honda TRX450R (Sportrax). Built with OEM-grade components from Vertex, Hot Rods, and Wrench Rabbit, this all-inclusive kit delivers unmatched reliability, precise fitment, and restored performance from crank to cam.
Ideal for riders rebuilding stock or performance motors, this kit provides every internal component needed for a professional-quality overhaul.
What’s Included
✅ Hot Rods crankshaft (stock stroke)
✅ Vertex piston kit (piston, rings, wrist pin & clips)
✅ Complete gasket and O-ring kit (top + bottom end)
✅ Main bearings and seals
✅ Transmission bearing kit
✅ Counter balancer bearing kit
✅ Countershaft bushing & seal kit
✅ Water pump rebuild kit
✅ Cam chain
✅ Oil seal kit
Fitment
📦 Fits the following models:
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2004 Honda TRX450R (Sportrax)
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2005 Honda TRX450R (Sportrax)
(Compatible with all TRX450R 450cc 4-stroke kick-start engines)
Key Features
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Complete all-in-one engine rebuild solution
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Includes crankshaft, piston, gaskets, bearings, and seals
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OEM-level fit and durability from Vertex and Hot Rods
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Restores factory compression and reliability
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Ideal for racing, dune, or trail applications
Warranty Info
Manufactured by Vertex / Wrench Rabbit.
Warranty service available directly through Vertex or Wrench Rabbit.
Price & SKU
💲 Retail Price: $1,156.95
SKU: WR101-031 / 0903-0971
Estimated Shipping Weight: 17.8 lb
Handling: Ships next business day
📦 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.
