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
-
PROX Crank Bearing and Seal Kit 23.CBS43004
PROX
$85.95Made 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 crankshafts09240356- SKU:
- 09240356
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- BEARING AND SEAL KIT
- STYLE:
- 4-STROKE
- TYPE:
- BALL
$85.95 -
PROX Crank Bearing and Seal Kit 23.CBS43087
PROX
$75.95Made 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 crankshafts09240357- SKU:
- 09240357
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING AND SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
$75.95 -
PROX Crank Bearing and Seal Kit 23.CBS45088
PROX
$65.95Made 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 crankshafts09240359- SKU:
- 09240359
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING AND SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
$65.95 -
PROX Crank Bearing and Seal Kit 23.CBS61009
PROX
$55.95Made 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 crankshafts09240361- SKU:
- 09240361
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
$55.95 -
PROX Crank Bearing and Seal Kit 23.CBS61097
PROX
$49.95Made 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 crankshafts09240362- SKU:
- 09240362
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING AND SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
$49.95 -
PROX Crank Bearing and Seal Kit 23.CBS62001
PROX
$105.95Made 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 crankshafts09240363- SKU:
- 09240363
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- STYLE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
$105.95 -
PROX Crank Bearing and Seal Kit 23.CBS63004
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 crankshafts09240365- SKU:
- 09240365
- Availability:
- Ships Same Business Day
- Weight:
- 1.33 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- STYLE:
- 2-STROKE
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$125.95 -
PROX Crank Bearing and Seal Kit 23.CBS63006
PROX
$149.95Made 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 crankshafts09240366- SKU:
- 09240366
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- STYLE:
- 4-STROKE
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
$149.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS13092
PROX
MSRP: $65.95Now: $56.00Was: $65.95Made 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 crankshafts09240302- SKU:
- 09240302
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- STYLE:
- 2-STROKE
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $65.95Now: $56.00Was: $65.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS14006
PROX
MSRP: $109.95Now: $93.00Was: $109.95Made 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 crankshafts09240305- SKU:
- 09240305
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING AND SEAL KIT
- STYLE:
- 4-STROKE
- TYPE:
- BALL
MSRP: $109.95Now: $93.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $93.00Was: $109.95Subtotal: -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS22005
PROX
MSRP: $59.95Now: $51.00Was: $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
MSRP: $59.95Now: $51.00Was: $59.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS24001
PROX
MSRP: $125.95Now: $107.00Was: $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
MSRP: $125.95Now: $107.00Was: $125.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS41088
PROX
MSRP: $33.95Now: $29.00Was: $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
MSRP: $33.95Now: $29.00Was: $33.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS61003
PROX
MSRP: $89.95Now: $76.00Was: $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
MSRP: $89.95Now: $76.00Was: $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
$23.99Qty in Cart: 0Quantity:Price:$23.99Subtotal: -
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
$23.99Qty in Cart: 0Quantity:Price:$23.99Subtotal: -
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
