Hot Rods Counter Balancer Bearing Kit BBK0020 — Yamaha YZ250F / YZ250FX / WR250F / YZ450F 2014-2026

Hot Rods Counter Balancer Bearing Kit BBK0020 — Yamaha YZ250F / YZ250FX / WR250F / YZ450F 2014-2026

Product Description

Note: This specialized kit contains internal counter balancer shaft bearings only; it does not include water pump bearings or transmission gear bearings.

Keep your high-RPM four-stroke powerplant running silky smooth and protect your chassis from harmonic fatigue with a premium Hot Rods Counter Balancer Bearing Kit. At high operating hours, the bearings supporting your internal engine counter balancer experience heavy rotational loads and structural stress. This kit acts as a heavy-duty engine replacement solution engineered to restore proper balancing alignment, remove loose internal play, and eliminate unwanted engine vibrations before they lead to structural case cracks.

This replacement kit comes fully stocked with trusted, precision-manufactured Hot Rods bearings sized exactly for the factory counter balancer shaft assembly. Built to meet strict OEM quality tolerances, these high-speed ball bearings ensure flawless shaft rotation, minimize internal friction drag, and handle massive torque loads. It is a vital maintenance package whenever you are performing a complete bottom end overhaul, swapping engine cases, or doing a full crankcase restoration.

Top Features: Hot Rods Counter Balancer Bearing Kit
o Includes trusted, premium-grade Hot Rods bearings for the internal counter balancer shaft.
o Reduces parasitic drag and crankshaft harmonic vibrations at maximum engine RPM.
o Engineered to meet or exceed strict factory OEM dimensions for a drop-in replacement fit.
o An absolute must-have package for any new counter balancer repair or complete engine case 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
2014-2026	Yamaha	YZ250F
2015-2026	Yamaha	YZ250FX
2015-2026	Yamaha	WR250F
2023-2026	Yamaha	YZ450F
2024-2026	Yamaha	YZ450FX
2024-2026	Yamaha	WR450F

Frequently Asked Questions

Q: Does this kit include the actual counter balancer weight or gear shaft?
A: No. This package includes the precision replacement ball bearings required to support the shaft inside the engine cases; it does not include the metal counter balancer weight assembly itself.

Q: Can I replace these balancer bearings without fully splitting my engine cases?
A: No, the counter balancer assembly is located deep inside the central crankcases on modern Yamaha four-stroke models. You must completely split the right and left case halves to pull the old balancer bearings and press these fresh units in.

Q: Why should I replace my balancer bearings during a routine crank rebuild?
A: If you drop a fresh, tight crankshaft assembly into an engine with worn balancer bearings, the remaining harmonic imbalance will quickly cause accelerated wear on your new main bearings and can ruin the internal engine casing alignment over time.

Expert Pro-Tip: When reassembling your bottom end, you must verify that the timing marks on your counter balancer drive gear are perfectly aligned with the corresponding marks on the crankshaft gear. Missing the timing alignment by even a single tooth will cause the balancer to swing out of phase with the piston stroke, which actually doubles engine vibration instead of canceling it out. Always use a quality assembly lube on the bearing tracks during drop-in and torque the balancer locking nut to factory specs using an accurate inch-pound wrench.

Recommended Pairings:
o Yamaha YZ250F / YZ250FX Performance Parts & Upgrades
o Yamaha YZ450F Performance Parts
o Premium Case Splitters & Bottom End Engine Tools

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