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
$91.95A complete crankshaft bearing and seal kit is essential for any rebuild—worn bearings compromise power delivery and accelerate wear on adjacent components. This Pro X kit supplies everything needed for a proper restoration, manufactured to OEM...09240356- 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
$91.95 -
PROX Crank Bearing and Seal Kit 23.CBS43087
PROX
$80.95A crankshaft rebuild demands precision—and compromising on bearing and seal quality is a guaranteed path to premature failure and costly downtime. The PROX Crank Bearing and Seal Kit 23.CBS43087 gives you OEM-spec components engineered to handle the...09240357- 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
$80.95 -
PROX Crank Bearing and Seal Kit 23.CBS45088
PROX
$70.95A complete crank bearing and seal replacement is essential maintenance for any high-performance engine, preventing catastrophic failure and restoring proper clearances after extended use or rebuild. This Pro X kit eliminates the guesswork by bundling...09240359- 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
$70.95 -
PROX Crank Bearing and Seal Kit 23.CBS61009
PROX
$59.95A crankshaft rebuild demands precision—one compromised bearing or seal leads to catastrophic engine failure. The PROX Crank Bearing and Seal Kit 23.CBS61009 eliminates guesswork by delivering every component you need in a single kit, manufactured to...09240361- 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
$59.95 -
PROX Crank Bearing and Seal Kit 23.CBS61097
PROX
$49.95A complete crank bearing and seal kit is essential for maintaining proper lubrication, reducing friction, and extending crankshaft life under high-stress conditions. Whether you're rebuilding after significant engine wear or performing preventive...09240362- 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
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
PROX Crank Bearing and Seal Kit 23.CBS62001
PROX
$112.95A complete crankshaft bearing and seal replacement is critical for maintaining peak engine reliability and performance, especially if you're running high RPMs or preparing for competition. This Pro X kit delivers all the components you need in one...09240363- 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
$112.95 -
PROX Crank Bearing and Seal Kit 23.CBS63004
PROX
$133.95A crankshaft bearing and seal failure can leave you stranded or worse—damage your entire engine. The PROX Crank Bearing and Seal Kit 23.CBS63004 gives you a complete, factory-spec replacement solution that restores your crank's reliability and...09240365- 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
$133.95 -
PROX Crank Bearing and Seal Kit 23.CBS63006
PROX
$149.95A quality crank bearing and seal kit is critical to engine reliability—worn or damaged bearings accelerate crankshaft wear and can lead to catastrophic engine failure. The PROX 23.CBS63006 delivers OEM-specification components that restore your...09240366- 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
$149.95Qty in Cart: 0Quantity:Price:$149.95Subtotal: -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS13092
PROX
MSRP: $70.95Now: $56.00Was: $70.95A complete crankshaft bearing and seal replacement isn't something you want to compromise on—worn bearings directly impact engine reliability, oil pressure stability, and longevity under load. This PROX kit eliminates the guesswork by delivering OEM-spec...09240302- 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: $70.95Now: $56.00Was: $70.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS14006
PROX
MSRP: $116.95Now: $93.00Was: $116.95A catastrophic crank bearing failure will sideline your engine—and your race season. This PROX Crank Bearing and Seal Kit delivers OEM-spec replacements for all critical bearing and seal positions, ensuring your crankshaft runs true under sustained high...09240305- 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: $116.95Now: $93.00Was: $116.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS22005
PROX
MSRP: $62.95Now: $51.00Was: $62.95A crankshaft rebuild demands precision bearings and seals that can withstand extreme loads and sustained RPM, and this Pro X kit delivers exactly that without compromise. Rather than sourcing individual components and risking fitment errors, this...09240313- 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: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS24001
PROX
MSRP: $133.95Now: $107.00Was: $133.95A crankshaft rebuild demands precision components that match OEM tolerances—any compromise on bearing or seal quality directly impacts engine reliability and performance. This Pro X kit delivers all necessary bearings and seals in one package,...09240327- 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: $133.95Now: $107.00Was: $133.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS41088
PROX
MSRP: $36.95Now: $29.00Was: $36.95A failing crankshaft bearing or seal can compromise your entire engine's integrity, leading to catastrophic damage and costly downtime. This PROX kit delivers OEM-specification bearings and seals in a single package, eliminating the guesswork and...09240349- 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: $36.95Now: $29.00Was: $36.95 -
On Sale
PROX Crank Bearing and Seal Kit 23.CBS61003
PROX
MSRP: $95.95Now: $76.00Was: $95.95A crankshaft rebuild demands precision-matched components that meet OEM tolerances—this is where corners cannot be cut. The PROX Crank Bearing and Seal Kit 23.CBS61003 delivers factory-spec bearings and seals in a single package, eliminating the...09240360- 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: $95.95Now: $76.00Was: $95.95 -
Wiseco Top End Bearing Kawasaki 1100ZXi 1996-2003 B1030
WISECO
$25.95The Wiseco Top End Bearing B1030 is engineered to handle sustained high-RPM operation without compromising reliability—critical for engines pushed to their limits. Whether you're racing or building a high-performance recreational engine, this bearing...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
$25.95 -
Wiseco Top End Bearing 20x25x22.8mm for 2003-2004 Polaris 700 Classic B1031
WISECO
$25.95If you're running your 2003-2004 Polaris 700 Classic at sustained high RPMs, factory bearings wear quickly under extreme conditions. The Wiseco B1031 top end bearing delivers the durability and precision you need to maintain consistent performance and...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
$25.95 -
Wiseco Top End Bearing 18x22x19.8mm for KTM 250 SX 1992-2024 B1037
WISECO
$25.95Top-end bearings are critical wear items in high-RPM two-stroke engines, and OEM replacements often lack the durability needed for sustained racing or aggressive trail riding. The Wiseco B1037 delivers superior longevity through precision engineering and...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
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Top End Bearing Yamaha YZ125 1997-2000 B1038
WISECO
$25.95The Wiseco B1038 top end bearing is engineered to handle the demanding conditions of high-RPM two-stroke racing. Factory OEM bearings wear quickly under sustained performance use, leading to increased friction, heat buildup, and potential engine failure...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
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Top End Bearing KTM 50 SX 2007-2022 B1041
WISECO
$25.95The Wiseco Top End Bearing B1041 is engineered for KTM 50 SX models to deliver reliable performance where it matters most—inside your engine. Whether you're rebuilding after a season of intense riding or upgrading to factory-level components, this...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
$25.95 -
Wiseco Top End Bearing for KTM 65 SX 2000-2021 B1042
WISECO
$25.95The top end bearing is critical to your KTM 65 SX's reliability under sustained high RPM operation. A worn or substandard bearing introduces friction, accelerates wear on adjacent components, and compromises the smooth power delivery your engine needs on...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
$25.95
