Hot Rods Crankshaft Assembly 4049 — Yamaha YZ250F 2003-2013

Product Description

Bring your high-revving engine back to life with the Hot Rods 4049 Crankshaft Assembly. Designed specifically for the long-running 2003-2013 Yamaha YZ250F, this heavy-duty assembly is built to withstand the demanding conditions of off-road racing and aggressive riding, providing a solid foundation for your next top-and-bottom-end rebuild.

Forged from premium 4140 steel, this crankshaft assembly comes completely ready for installation. It is factory assembled and balanced to match or exceed OEM specifications for flawless performance and durability. Each unit is delivered complete with proven Hot Rods connecting rods and top-end bearings, with integrated gears constructed to a highly durable DIN class 9 or higher standard. Designed with longevity in mind, this crank is also completely rebuildable down the road using genuine Hot Rods components.

Top Features: Hot Rods Crankshaft Assembly

• Sold complete with trusted Hot Rods connecting rods and top-end bearings
• Factory assembled and balanced to meet or exceed OEM specifications
• Manufactured from heavy-duty 4140 steel for maximum strength and impact resistance
• Gears engineered to a quality level of DIN class 9 or higher
• Completely rebuildable for extended lifecycle and reliability

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 assembly come balanced out of the box?
A: Yes. Every Hot Rods crankshaft assembly is factory assembled and trued to OEM tolerances. You do not need to take it to a machine shop for balancing or alignment prior to installation.

Q: How do I know if my old crankshaft needs to be replaced?
A: If you detect vertical play in the connecting rod big-end bearing, see scoring on the crank webs, or find that the rod side clearance exceeds the service limit in your Yamaha manual, it is time for a new assembly.

Expert Pro-Tip: When splitting your engine cases to drop in this new crankshaft, always inspect your oil pump rotors. A worn-out oil pump will fail to deliver adequate pressure to the new rod bearing, resulting in premature crankshaft failure. Replacing the oil pump assembly is cheap insurance during a major overhaul.

Recommended Pairings:
o Yamaha YZ250F Performance Parts & Upgrades
o Yamaha 4-Stroke Performance Parts
o Assembly Lube, Premium Cleaners, & Chemicals

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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