Vertex Engine Rebuild Kit WR101-078 — Yamaha YFZ450 2004-2005

Vertex Engine Rebuild Kit WR101-078 — Yamaha YFZ450 2004-2005

Product Description

The Vertex Engine Rebuild Kit WR101-078 is designed to bring your early-model Yamaha YFZ450 back to peak performance. Providing a comprehensive, single-source solution for your engine restoration, this kit contains all the high-quality components required to rebuild your powerplant from the crankshaft up to the cylinder head.

By bundling essential components like the crankshaft, piston, and a complete suite of bearings and seals, Vertex ensures perfect compatibility and reliability. Whether you are addressing engine wear or performing a full restoration, this kit delivers the precision and durability needed for consistent ATV performance.

Top Features: Vertex Engine Rebuild Kit

• All-In-One Restoration: Includes crankshaft, piston kit, engine gasket kit with oil seals, main bearings, and transmission bearings.
• Complete Service Set: Contains vital components such as a water pump rebuild kit, countershaft bushing/seal kit, and cam chain.
• OEM-Grade Quality: Each part is engineered to meet or exceed original equipment specifications for dependable fitment.
• Standard Compression: Piston kit designed to restore factory-level power characteristics and long-term engine health.
• Reliability Focused: Includes counter-balancer bearings (where applicable) for smooth, balanced engine operation.

Please review the detailed compatibility data below to ensure an exact fitment match for your ATV before finalizing your purchase.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2004-2005	Yamaha	YFZ450

Frequently Asked Questions

Q: Does this kit cover both the top and bottom end of the engine?
A: Yes, the WR101-078 is a complete rebuild kit covering both the bottom end (crankshaft and main bearings) and top end (piston and gaskets) for a thorough restoration.

Q: Are all necessary seals and bearings included?
A: Yes, the kit is all-inclusive, providing main engine bearings, transmission bearings, oil seals, and the water pump rebuild kit to ensure no essential part is left behind.

Expert Pro-Tip: When rebuilding your YFZ450 engine, ensure that you flush the oil tank and cooler thoroughly. Old debris from a previous engine failure can often hide in the oil lines and quickly damage your new components. Always use a fresh oil filter and high-quality oil to protect your investment during the critical first hours of break-in.

Recommended Pairings:

• Essential Off-Road ATV Tools
• Premium ATV Maintenance Chemicals

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