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Vertex
Vertex Engine Rebuild Kit WR101-089 — Yamaha YZ85 2002-2018 / YZ80 1993-2001
Vertex Engine Rebuild Kit WR101-089 — Yamaha YZ85 2002-2018 / YZ80 1993-2001
Regular price
$480.21 USD
Regular price
$564.95 USD
Sale price
$480.21 USD
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Vertex / Wrench Rabbit Engine Rebuild Kit WR101-089 — Yamaha YZ85 2002-2018 / YZ80 1993-2001
Product Description
Revive your mini machine's power and on-track reliability with the Vertex / Wrench Rabbit Complete Engine Rebuild Kit. Engineered specifically for racers and trail riders noticing a loss in compression or throttle response, this comprehensive box provides an all-in-one overhaul solution for your 2-stroke powerhouse. This kit delivers crisp power delivery, improved structural durability, and the high-rpm strength necessary to stay ahead on the motocross track or out on the trail.
By consolidating leading aftermarket performance components into a unified package, this system eliminates the risk and stress of sourcing individual internal parts across multiple vendors. The top end is anchored by a high-grade Vertex replica standard-compression piston kit, while the bottom end features a heavy-duty, factory-balanced Hot Rods stock-stroke crankshaft assembly. From precision-matched main bearings to specialized cooling circuit water pump seals, every single element in this kit works seamlessly to protect your engine under heavy mechanical loads.
Top Features: Vertex / Wrench Rabbit Engine Rebuild Kit
- • Convenient one-box solution containing virtually all essential internal components for a professional, top-to-bottom engine overhaul.
- • Vertex standard-compression replica piston kit complete with high-tensile rings, wrist pin, and secure retaining clips.
- • Hot Rods heavy-duty stock-stroke crankshaft assembly built to handle extreme revs, including a premium wrist pin bearing.
- • High-grade Hot Rods bearing and seal kits covering the main mains, transmission shafts, counter-balancer, and water pump assembly.
- • Vertex complete gasket and oil seal layout supplying total top and bottom end coverage with exact O-ring configurations.
Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.
Fitment List
| Year Range | Vehicle Brand | Vehicle Model & Sub-Model |
|---|---|---|
| 2002–2018 | Yamaha | YZ85 (Kit WR101-089) |
| 1993–2001 | Yamaha | YZ80 (Kit WR101-089) |
Frequently Asked Questions
Q: Does this rebuild kit include everything needed for a full engine overhaul?
A: Yes. It includes the complete stock-stroke crankshaft assembly, standard compression piston kit, main bearings, transmission bearings, water pump bearings, oil seals, and all top and bottom end gaskets.
Q: Will this kit match the fitment layout on older YZ80 models?
A: Yes, this specific kit configuration is structurally compatible with late-generation Yamaha YZ80 models running from 1993 through 2001, as well as 2002 to 2018 YZ85 platforms.
Q: Are the internal seals resilient to modern ethanol blended fuels?
A: Yes, the Vertex and Hot Rods seals included in this kit utilize advanced synthetic rubber formulations engineered to withstand modern pump fuels and high-performance racing pre-mix lubricants without premature hardening.
Expert Pro-Tip: When rebuilding an 85cc or 80cc engine block, paying close attention to the small details makes all the difference in component lifespan. Before installing the new Vertex piston, verify that the rings are installed with the markings facing up and ensure you clock the ring gaps correctly away from the exhaust port. Always use a lint-free assembly lubricant on the main bearings and the big-end rod bearing during mockup. Additionally, check that your crankcase vent hose is entirely clear and free of mud before dropping the completed power unit back into the chassis; a blocked vent line will create internal case pressure that quickly pushes out your new countershaft and shifter seals.
Recommended Pairings:
At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.
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