Hot Rods K021 Crank Bearing & Seal Kit 01-24 Yamaha YZ250F YZ250FX YZ450F

When you are splitting the cases for a bottom-end rebuild, don't risk your engine's longevity on worn-out components. The Hot Rods K021 Main Crankshaft Bearing and Seal Kit is the definitive OEM Replacement solution designed to provide a smooth, reliable foundation for your high-performance motor. Moto-House MX understands that precision is everything in motocross, and this kit delivers the professional-grade reliability required to keep your Yamaha on the track and out of the shop.

Each kit is engineered to complement Hot Rods crankshaft assemblies, featuring precision-machined ball bearings and high-pressure seals that meet or exceed factory specifications. These components are built to withstand the extreme heat and rotational stress of modern four-stroke engines, ensuring optimal oil retention and reduced friction. Whether you are racing professionally or hitting the local trails, this kit provides the Heavy Duty durability needed for a complete, worry-free installation.

Top Features: Hot Rods K021 Main Crankshaft Bearing and Seal Kit

• Precision Bearings: Includes high-quality, high-speed main crankshaft ball bearings for reduced friction and maximum life.
• Complete Seal Set: Comes with precision-molded crank seals to ensure a perfect, leak-proof seal during reassembly.
• Engineered Compatibility: Specifically designed to work seamlessly with Hot Rods or OEM crankshaft assemblies.
• Pro-Grade Durability: Built to handle the rigorous demands of motocross and off-road racing environments.
• Convenient All-In-One Kit: Eliminates the guesswork by providing the essential main bearings and seals in one package.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2001-2024	Yamaha	YZ250F / WR250F
2015-2024	Yamaha	YZ250FX
2003-2015	Yamaha	YZ450F
2008	Yamaha	WR250R / WR250X

Frequently Asked Questions

Is this kit compatible with my stock Yamaha crankshaft?
Yes, while these are the perfect complement to a Hot Rods crank, they are designed to meet OEM specifications and work perfectly with your stock crankshaft.

Does this kit include every seal for the entire engine?
No, this specific kit (K021) focuses on the critical main crankshaft bearings and the two primary crank seals. For a full engine gasket set, check our other listings at Moto-House MX.

Why should I replace my seals when replacing bearings?
Main seals are a wear item; installing fresh seals alongside new bearings ensures you maintain proper primary compression and prevents oil contamination or air leaks.

Upgrade Your Ride at Moto-House MX today and build your engine with parts you can trust!

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The best motocross shop in Central Florida.