Hot Rods Crankshaft Assembly 4034 — Yamaha YZ85 2002-2018
Product Description
The Hot Rods 4034 Crankshaft Assembly is the gold standard for riders looking to restore factory performance or build a reliable high-revving engine for their Yamaha YZ85. Engineered to meet or exceed OEM specifications, this assembly provides the durability and precision necessary for demanding off-road conditions.
Every assembly comes factory-trued and ready for installation, saving you the time and expense of balancing. Built using high-strength 4140 steel and featuring DIN class 9 quality gears, this crankshaft offers superior resistance to wear and fatigue, ensuring your YZ85 maintains its peak power output throughout the entire race season.
Top Features: Hot Rods Crankshaft Assembly
- Complete assembly featuring proven Hot Rods connecting rods and top-end bearings.
- Factory assembled and trued to exact OEM specifications for a direct drop-in fit.
- Constructed from durable 4140 steel with high-precision DIN class 9 gears.
- Fully rebuildable design allows for long-term maintenance using genuine Hot Rods components.
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 |
Frequently Asked Questions
Q: Does this crankshaft come with the main bearings?
A: No, this is a complete crankshaft assembly. You will need to purchase your main crank bearings and engine seals separately for a complete bottom-end rebuild.
Q: Is this a stroker crank or a stock replacement?
A: This is an OEM stroke crankshaft, designed to match the original factory displacement and power characteristics of your YZ85.
Expert Pro-Tip: When installing a new crankshaft, always replace your main bearings and seals as a set. Never force the crank into the cases using a hammer; use a proper crankshaft installation tool to pull the crank into the bearings. This prevents side-loading the bearings and ensures the crank spins perfectly true from the first start-up.
Recommended Pairings:
o Yamaha YZ85 Performance Parts & Upgrades
o Premium Motorcycle Chemicals & Assembly Lubes
o Yamaha 2-Stroke Performance Parts
About Moto-House MX
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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