Wrench Rabbit Engine Rebuild Kit 2004-2007 Yamaha YFZ450 WR101-186

When your YFZ450 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates the guesswork of sourcing individual components. The Wrench Rabbit WR101-186 bundles all the critical internals—pistons, cranks, bearings, and gaskets—so you can get back to riding with confidence. This is the complete solution for restoring your machine to factory performance standards without cutting corners.

The kit pairs a Vertex piston assembly with a Hot Rods heavy-duty crank, ensuring reliable power delivery and durability. You'll also receive main bearing and seal kits, transmission bearings, counter balancer bearings, water pump components, and a full gasket set—everything needed for a leak-free, smooth-running engine. Whether you're a professional mechanic or experienced DIY builder, this comprehensive package reduces downtime and delivers consistent results.

• Fits: 2004–2007 Yamaha YFZ450
• MPN: WR101-186
• Vertex piston kit included
• Standard compression ratio
• Hot Rods crank assembly
• Stock stroke design
• Main bearing/seal kit
• Transmission bearing kit
• Counter balancer bearings
• Water pump bearing kit
• Complete gasket set
• Wrist pin and clips
• Bolt-on installation
• Professional or DIY suitable