Moose Offroad 24-1123 Crankshaft Main Bearing Kit — Beta RR RS RX X-Pro 350-500 4T

Moose Offroad 24-1123 — Precision Crankshaft Main Bearings and High-RPM Reliability for Beta 4-Stroke Engines

Ensure the heart of your engine remains stable and vibration-free with the Moose Offroad 24-1123 Crankshaft Bearing Kit. Specifically engineered for the high-performance Beta 4-stroke lineup—including the RR, Race Edition, and the new X-Pro series—this kit provides the critical foundation for your engine's rotating assembly. The crankshaft bearings are the highest-stress components in your bottom end, responsible for supporting the crank at extreme RPMs while maintaining perfect alignment. When these bearings begin to wear, they can cause destructive vibration, power loss, and eventually catastrophic engine failure.

Moose Offroad utilizes precision-manufactured bearings designed to meet or exceed OEM specifications for load capacity and heat dissipation. This kit contains both the right and left crankshaft main bearings, ensuring a matched set for a complete bottom-end rebuild. For these 4-stroke applications, the bearings are designed to be lubricated by the engine's internal oiling system, providing a low-friction interface that stands up to the rigors of competitive motocross and technical enduro riding. Whether you are refreshing a high-hour Beta 390 RR or building a race-ready 450 RX, the 24-1123 kit delivers the structural integrity required for modern four-stroke power.

• Precision Engineered: Manufactured to exacting tolerances to ensure perfect crankshaft alignment and minimal parasitic drag.
• Complete Main Set: Includes both the left and right side crankshaft main bearings for a comprehensive bottom-end service.
• High-RPM Durability: Specifically rated for the high heat and rapid acceleration cycles of Beta’s 350cc to 500cc 4-stroke engines.
• OE Fitment: Designed as a direct replacement for factory hardware, compatible with Beta RR, RS, RX, and X-Pro models from 2011 to 2025.
• Bottom-End Stability: Reduces engine vibration and extends the life of your connecting rod and transmission components.

Moto-House MX Pro Tip:

A crankshaft bearing replacement is a significant "split-case" job that requires precision and the right tools. When installing the Moose 24-1123 kit, we highly recommend the "heat-and-freeze" method: gently heat the engine cases and freeze the bearings to allow them to drop into place without excessive force, which protects the bearing races from damage. Since this is a 4-stroke kit, please note that external oil seals are not included as the bearings are oil-bathed. Always pair a new set of crank bearings with a complete engine gasket set and a fresh oil pump inspection to ensure your Beta's bottom end remains bulletproof for the next 100 hours of riding.

Technical Specification	Details
Application	Crankshaft Main Bearings
Engine Type	4-Stroke (350cc - 500cc)
Kit Contents	Right & Left Bearings
Note	Does not include seals (4-Stroke application)

FAQ Questions

Q) Does this kit include the crankshaft seals?
A) No. As noted for 4-stroke applications, this kit contains the precision bearings only. 4-stroke crank seals are typically part of a complete engine oil seal kit.

Q) Will this work for the 2025 Beta 450 RX?
A) Yes, this kit is verified for the latest Beta 4-stroke motocross and off-road models, including the 450 RX and X-Pro series.

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