Hot Rods Crankshaft Assembly 4054 — Yamaha YZ125 / YZ125X 2005-2022
Product Description
Get your Yamaha 125cc 2-stroke back on the track with the Hot Rods 4054 Crankshaft Assembly. Designed for the YZ125 and YZ125X, this high-performance assembly takes the complexity out of engine building by arriving complete, pre-assembled, and factory-trued to precise OEM specifications.
Forged from premium 4140 steel, this crankshaft is engineered to provide superior strength and durability compared to standard components. The assembly includes proven Hot Rods connecting rods and top-end bearings, with precision-machined gears rated at DIN class 9 or higher. For long-term peace of mind, the entire unit is completely rebuildable using genuine Hot Rods components, making it an essential choice for any serious 125 engine overhaul.
Top Features: Hot Rods Crankshaft Assembly
- Sold complete with proven Hot Rods connecting rods and top-end bearings
- Factory assembled and trued to meet or exceed OEM performance specifications
- Manufactured from durable 4140 steel for extreme 2-stroke reliability
- Gears precision-machined to DIN class 9 quality level or higher
- Complete, pre-balanced, and ready for immediate installation
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 |
| 2005-2021 |
Yamaha |
YZ125 |
| 2020-2022 |
Yamaha |
YZ125X |
Frequently Asked Questions
Q: Does this kit save me time at the machine shop?
A: Absolutely. Because it is already pressed and trued to OEM specs, you can drop this assembly directly into your cases, saving you the cost and delay of professional crankshaft machine work.
Q: Is this assembly stronger than my stock crankshaft?
A: Hot Rods crankshafts are designed to meet or exceed OEM specifications, often providing better material quality and heat-treatment processes that result in improved durability for high-revving 125cc engines.
Expert Pro-Tip: When installing a new crankshaft, ensure your main bearing seats are perfectly clean. Even a microscopic spec of dirt can cause the bearing to sit slightly misaligned, which will lead to premature crank failure and unwanted vibration.
Recommended Pairings:
o Yamaha 2-Stroke Performance Parts
o Yamaha YZ125 Performance Parts
o Assembly Lube, Crank Seals, & Chemicals
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