Dirt Bike Engine Bearings
Dirt Bike Engine Bearings & Crank Bearing Kits for Yamaha, Honda & Beta at JJ Motorsports
Rebuild your dirt bike's bottom end with premium crankshaft bearings, needle bearings, and complete seal kits from JJ Motorsports — precision-engineered for perfect fit, reduced friction, and extreme durability in motocross, enduro, and trail riding. Our selection includes high-quality main bearings, crank bearing/seal kits, and needle bearings designed to handle high RPM, high heat, and heavy loads while restoring smooth, quiet operation. Compatible with top models like Yamaha YZ/WR, Honda CRF/CR, Beta RR, and more, these components from trusted brands deliver OEM or better performance with upgraded materials that outlast stock bearings in dusty, abusive conditions. Whether you're splitting the cases for a full rebuild or just replacing worn mains, these kits give you everything — bearings, seals, and gaskets — for factory-fresh feel and championship-level reliability.
At JJ Motorsports, we stock the best dirt bike engine bearings and crank kits from Moose Racing, Shindy, and Vintco with fast shipping and expert support. Free shipping over $99!
Top Dirt Bike Engine Bearings & Kits
- Shindy Needle Bearing 16 mm x 21 mm x 23 mm Yamaha 10-301 – High-quality needle bearing for Yamaha models; exact OEM spec for shock linkage and swingarm applications.
- Moose Offroad Crank Bearing & Seal Kit Beta 24-1128 – Complete crank bearing and seal kit for Beta RR models; includes both sides for full bottom-end refresh.
- Vintco Main Bearing and Seal Kit Honda KMB034 – Premium main bearing and crank seal kit for vintage Honda models; perfect for classic CR and XR restoration with modern durability.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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PROX Crank Bearing and Seal Kit 23.CBS22005
PROX
$59.95Made to exact OEM specifications for maximum performance and durability, Includes all necessary bearings/seals for a component's replacement, For use with OEM or Pro X crankshafts09240313- SKU:
- 09240313
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING AND SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- TYPE:
- BALL
$59.95 -
PROX Crank Bearing and Seal Kit 23.CBS24001
PROX
$125.95Made to exact OEM specifications for maximum performance and durability, Includes all necessary bearings/seals for a component's replacement, For use with OEM or Pro X crankshafts09240327- SKU:
- 09240327
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- STYLE:
- 4-STROKE
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING SET
- RIDING STYLE:
- STREET
$125.95 -
PROX Crank Bearing and Seal Kit 23.CBS41088
PROX
$33.95Made to exact OEM specifications for maximum performance and durability, Includes all necessary bearings/seals for a component's replacement, For use with OEM or Pro X crankshafts09240349- SKU:
- 09240349
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- STYLE:
- 2-STROKE
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$33.95 -
PROX Crank Bearing and Seal Kit 23.CBS61003
PROX
$89.95Made to exact OEM specifications for maximum performance and durability, Includes all necessary bearings/seals for a component's replacement, For use with OEM or Pro X crankshafts09240360- SKU:
- 09240360
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
$89.95 -
Wiseco Top End Bearing Kawasaki 1100ZXi 1996-2003 B1030
WISECO
$23.99Experience unparalleled performance with the WISECO Top End Bearing B1030, expertly crafted from a high-silicon aluminum alloy for exceptional strength and reliability. Designed for high-speed engine applications, these bearings ensure smooth operation...B1030- SKU:
- B1030
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- BEARING
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 27 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 22 MM
- LENGTH METRIC:
- 24.8 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- WATERCRAFT
$23.99 -
Wiseco Top End Bearing 20x25x22.8mm for 2003-2004 Polaris 700 Classic B1031
WISECO
$23.99Engineered for performance, the WISECO Top End Bearing B1031 is crafted from a premium high-silicon aluminum alloy, ensuring unmatched strength and reliability. Designed to meet rigorous standards, these bearings provide exceptional durability and smooth...B1031- SKU:
- B1031
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- SNOW
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 25 MM
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 20 MM
- LENGTH METRIC:
- 23 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- APPLICATION:
- PISTON
$23.99 -
Wiseco Top End Bearing 18x22x19.8mm for KTM 250 SX 1992-2024 B1037
WISECO
$23.99Experience unparalleled performance with the WISECO Top End Bearing B1037, engineered from a premium high-silicon aluminum alloy for superior strength and reliability. Designed for high-speed engine applications, these bearings ensure smooth operation...B1037- SKU:
- B1037
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- SILICONE
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 19.8 MM
$23.99 -
Wiseco Top End Bearing Yamaha YZ125 1997-2000 B1038
WISECO
$23.99Experience unparalleled performance with the WISECO Top End Bearing B1038, engineered from a premium high-silicon aluminum alloy. Designed for exceptional strength and reliability, these bearings ensure smooth operation even at high engine speeds, making...B1038- SKU:
- B1038
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER METRIC:
- 15 MM
- MATERIAL:
- ALUMINUM
- TYPE:
- TOP END
- UNITS:
- EACH
- OUTSIDE DIAMETER METRIC:
- 20 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 17.8 MM
$23.99 -
Wiseco Top End Bearing KTM 50 SX 2007-2022 B1041
WISECO
$23.99Engineered for peak performance, the WISECO Top End Bearing B1041 is crafted from a premium high-silicon aluminum alloy, ensuring exceptional strength and reliability. These bearings are meticulously manufactured to meet rigorous standards, offering...B1041- SKU:
- B1041
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- BEARING
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 12 MM
- LENGTH METRIC:
- 14.5 MM
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- OUTSIDE DIAMETER METRIC:
- 15 MM
$23.99 -
Wiseco Top End Bearing for KTM 65 SX 2000-2021 B1042
WISECO
$23.99Experience unparalleled performance with the WISECO Top End Bearing B1042, engineered from premium high-silicon aluminum alloy for exceptional durability and reliability. Designed to withstand the rigors of high-speed engine operation, these bearings...B1042- SKU:
- B1042
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER METRIC:
- 12 MM
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- BEARING
- LENGTH METRIC:
- 16.3 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 15 MM
$23.99 -
Wossner 12x15x14.5 mm Top End Bearing for KTM 50 SX 2007-2022 N1001
WOSSNER
$18.50The WOSSNER Top End Bearing is engineered for high performance and durability, making it an essential component for your 50SX motorcycle. With precise dimensions of 12 mm x 15 mm x 14.5 mm, this bearing ensures optimal fit and function, enhancing the...09240494- SKU:
- 09240494
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER METRIC:
- 12 MM
- LENGTH METRIC:
- 14.5 MM
- PRODUCT NAME:
- BEARING
- OUTSIDE DIAMETER METRIC:
- 15 MM
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$18.50 -
Wossner Top End Bearing 14x18x16.5mm for 2002-2022 Yamaha YZ85 N1006
WOSSNER
$18.50The WOSSNER Top End Bearing N1006 is engineered for high performance and durability, making it an essential component for your engine's top end assembly. With precise dimensions and superior materials, this bearing ensures smooth operation and longevity,...09240447- SKU:
- 09240447
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BEARING
- LENGTH METRIC:
- 16.5 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- INSIDE DIAMETER METRIC:
- 14 MM
- RIDING STYLE:
- OFF-ROAD
$18.50 -
Wossner Top End Bearing for Kawasaki KX85 2001-2013 N1007
WOSSNER
$18.50The WOSSNER Top End Bearing is engineered for optimal performance and durability, ensuring a reliable connection in high-stress environments. With precise dimensions of 14 mm x 18 mm x 17.2 mm, it is designed to fit seamlessly in various applications,...09240448- SKU:
- 09240448
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 17.2 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER METRIC:
- 18 MM
- PRODUCT NAME:
- BEARING
$18.50 -
Wossner Top End Bearing 15x19x19.5 mm for 2007-2014 KTM 125 SX N1010
WOSSNER
$18.50The WOSSNER Top End Bearing is engineered for optimal performance and reliability in high-demand applications. With precise dimensions of 15 mm x 19 mm x 19.5 mm, this bearing ensures a perfect fit and smooth operation. Designed to withstand extreme...09240450- SKU:
- 09240450
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 19 MM
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER METRIC:
- 15 MM
- LENGTH METRIC:
- 19.5 MM
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- EACH
- PRODUCT NAME:
- BEARING
$18.50 -
Wossner Top End Bearing 18 mm x 22 mm x 19.8 mm N1020
WOSSNER
$18.50The WOSSNER Top End Bearing is engineered for optimal performance and durability in high-demand applications. Designed with precision, this bearing ensures smooth operation and longevity, making it an essential component for your machinery. Upgrade your...09240456- SKU:
- 09240456
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 19.8 MM
- OUTSIDE DIAMETER METRIC:
- 22 MM
- APPLICATION:
- CONNECTING ROD
- INSIDE DIAMETER METRIC:
- 18 MM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.50 -
Wossner Top End Bearing 18x22x21.8mm Honda CR250R N1021
WOSSNER
$18.50The WOSSNER Top End Bearing is engineered for high-performance applications, providing exceptional durability and reliability. Designed to fit a variety of engines, this bearing ensures optimal performance and longevity under demanding conditions...09240457- SKU:
- 09240457
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER METRIC:
- 18 MM
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- OUTSIDE DIAMETER METRIC:
- 22 MM
- LENGTH METRIC:
- 21.8 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.50 -
Wossner Top End Bearing 18x23x21.8mm Suzuki RM250 1977-2008 N1022
WOSSNER
$18.50Experience unparalleled performance with the WOSSNER Top End Bearing, designed for optimal durability and efficiency in high-demand applications. This precision-engineered bearing ensures smooth operation and longevity, making it an essential component...09240458- SKU:
- 09240458
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- LENGTH METRIC:
- 21.8 MM
- OUTSIDE DIAMETER METRIC:
- 23 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- CONNECTING ROD
- UNITS:
- EACH
$18.50 -
Wossner Top End Bearing for Kawasaki KX65 2000-2022 N1036
WOSSNER
$18.50Experience superior performance and reliability with the WOSSNER Top End Bearing, designed specifically for high-demand applications. This precision-engineered bearing ensures smooth operation and longevity, making it an essential component for any...09240459- SKU:
- 09240459
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 16 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- INSIDE DIAMETER METRIC:
- 12 MM
- LENGTH METRIC:
- 15.8 MM
$18.50 -
Wiseco Top End Bearing 19x24x24.8 for Kawasaki KX500 1988-2004 B1036
WISECO
$23.99Engineered for peak performance, the WISECO Top End Bearing combines advanced materials with precision manufacturing to ensure reliability and efficiency. Its high-silicon aluminum alloy construction provides exceptional strength, while the case-hardened...09240123- SKU:
- 09240123
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 24 MM
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 19 MM
- LENGTH METRIC:
- 24.8 MM
- PRODUCT NAME:
- BEARING
- APPLICATION:
- PISTON
$23.99 -
Wiseco Top End Bearing 20 x 25 x 21.8 mm for Polaris 440 Pro X 2001-2003 B1039
WISECO
$23.99Engineered for peak performance, the WISECO Top End Bearing is crafted from high-silicon aluminum alloy, ensuring exceptional strength and reliability. Designed to meet the demands of high-speed engines, these bearings provide smooth operation and...09240124- SKU:
- 09240124
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 20 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 25 MM
- UNITS:
- EACH
- LENGTH METRIC:
- 21.8 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- SILICONE
- RIDING STYLE:
- WATERCRAFT
$23.99Qty in Cart: 0Quantity:Price:$23.99Subtotal:
