Hot Rods Crankshaft Assembly 4036 — Yamaha YZ125 2001-2004

Product Description

Bring your 2001-2004 Yamaha YZ125 back to peak performance with the Hot Rods 4036 Crankshaft Assembly. Designed as a direct, high-quality replacement for your engine's bottom end, this assembly arrives fully pre-assembled and factory-trued to exact OEM specifications, saving you significant time and labor during your rebuild.

Forged from high-grade 4140 steel, this crankshaft is engineered to meet or exceed the performance and durability of factory components. It comes complete with proven Hot Rods connecting rods and top-end bearings, and features precision-machined gears rated at DIN class 9 or higher. For long-term serviceability, the unit is completely rebuildable using genuine Hot Rods parts, ensuring your YZ125 stays race-ready for seasons to come.

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

Frequently Asked Questions

Q: Does this crankshaft come with all necessary bearings?
A: This assembly includes the connecting rod and top-end bearings. We always recommend purchasing a new set of main bearings and seals separately to complete your bottom-end service.

Q: Is this crankshaft assembly a drop-in part?
A: Yes. Because it is factory-trued, this assembly is ready to be installed directly into your engine cases without any further machine work required.

Expert Pro-Tip: When installing the crankshaft into your cases, check the crankshaft end play. On these YZ125 models, excessive end play can lead to premature seal wear, so ensure your thrust washers are in good condition and installed correctly.

Recommended Pairings:
o Yamaha 2-Stroke Performance Parts
o Yamaha YZ125 Performance Parts & Upgrades
o Assembly Lube, Crank Seals, & Chemicals

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