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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HOT RODS Crank Bearings K238
HOT RODS
$75.95A crankshaft assembly is only as reliable as its bearing support system. The HOT RODS K238 crank bearing kit provides precision-engineered main bearings and seals that eliminate excessive clearances and prevent catastrophic bearing failure under high RPM...09240060- SKU:
- 09240060
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$75.95 -
HOT RODS Crank Bearings K055
HOT RODS
$104.95A crankshaft is only as reliable as its bearings. The HOT RODS K055 main bearing and seal kit ensures proper load distribution, reduces friction, and protects against catastrophic engine failure during high-RPM operation. Whether you're building a...09240165- SKU:
- 09240165
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- UNITS:
- SET
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
Wiseco Top End Bearing Kawasaki KDX200 1986-2006 B1008
WISECO
$25.95Top-end bearing wear accelerates engine deterioration and reduces reliability on the track or trail. The Wiseco B1008 delivers precision-engineered durability built specifically for KDX200 engines, maintaining consistent performance across decades of...B1008- SKU:
- B1008
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- TOP END
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 18 MM
- LENGTH METRIC:
- 22 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$25.95 -
HOT RODS Crank Bearings K072
HOT RODS
$89.95A crankshaft is only as reliable as its bearings. The HOT RODS K072 crank bearing and seal kit ensures proper load distribution, reduced friction, and extended engine longevity—critical when you're pushing performance limits. Whether you're running a...09240247- SKU:
- 09240247
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BALL
$89.95Qty in Cart: 0Quantity:Price:$89.95Subtotal: -
HOT RODS Top End Bearing WB107
HOT RODS
$21.95The HOT RODS Top End Bearing WB107 is a precision needle-cage bearing engineered for the piston end of your connecting rod, where load transfer and rotational speed demand uncompromising durability. This bearing eliminates lateral play and reduces...09240568- SKU:
- 09240568
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- WRIST PIN
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
$21.95 -
HOT RODS Top End Bearing WB108
HOT RODS
$21.95The HOT RODS Top End Bearing WB108 is a precision needle-cage bearing engineered to handle the extreme reciprocating forces at the piston end of your connecting rod. This bearing is critical to reducing friction, minimizing wear, and maintaining...09240569- SKU:
- 09240569
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BEARING
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WRIST PIN
- UNITS:
- EACH
$21.95 -
HOT RODS Top End Bearing WB120
HOT RODS
$22.95The HOT RODS Top End Bearing WB120 is engineered to handle the extreme pressures and reciprocating loads at the piston end of your connecting rod. A quality top-end bearing directly impacts engine reliability, reduces friction losses, and extends the...09240574- SKU:
- 09240574
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WRIST PIN
- UNITS:
- EACH
- PRODUCT NAME:
- BEARING
$22.95 -
HOT RODS Crank Bearings K005
HOT RODS
$118.95A crankshaft assembly is only as reliable as its bearings—and cheap bearing kits are a false economy that can cost you race wins or engine rebuilds. HOT RODS K005 Crank Bearings deliver precision-engineered main bearing and seal kits designed to handle...09240025- SKU:
- 09240025
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- RIDING STYLE:
- STREET
$118.95 -
HOT RODS Crank Bearings K008
HOT RODS
$65.95A crankshaft is only as reliable as its bearings. The HOT RODS K008 Crank Bearings deliver precision-engineered support for your crankshaft assembly, ensuring proper load distribution, minimal friction, and consistent performance under sustained RPM...09240030- SKU:
- 09240030
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$65.95Qty in Cart: 0Quantity:Price:$65.95Subtotal: -
Wossner Top End Bearing Yamaha YZ125 1997-2001 N1011
WOSSNER
$18.50The Wossner Top End Bearing is a critical wear item for YZ125 top-end rebuilds—worn bearings cause excessive piston slap, reduced ring seal, and accelerated bore wear. This OEM-quality replacement restores proper piston-to-rod geometry and ensures...09240451- SKU:
- 09240451
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 17.8 MM
- INSIDE DIAMETER METRIC:
- 15 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- OUTSIDE DIAMETER METRIC:
- 20 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$18.50Qty in Cart: 0Quantity:Price:$18.50Subtotal: -
HOT RODS Crank Bearings K012
HOT RODS
$113.95A crankshaft is only as reliable as its bearings. The HOT RODS K012 crank bearing and seal kit ensures proper load distribution, oil pressure integrity, and long-term durability when you're running a freshly rebuilt or upgraded crankshaft assembly...09240034- SKU:
- 09240034
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$113.95 -
HOT RODS Crank Bearings K009
HOT RODS
$64.95Crankshaft reliability hinges on bearing quality—inadequate bearings introduce excessive clearance, accelerate wear, and compromise engine stability at high RPM. The HOT RODS K009 crank bearing and seal kit delivers precision tolerances engineered to...09240031- SKU:
- 09240031
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal: -
MOOSE RACING Crank Bearing - KDX/JR50 24-1067
MOOSE RACING
$43.95A worn or failing crankshaft bearing is the fastest way to turn a running 2-stroke into a seized engine. This MOOSE RACING precision bearing kit restores proper crankshaft support and sealing, eliminating side play that kills power delivery and...09240102- SKU:
- 09240102
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
$43.95 -
PROX Crank Bearing and Seal Kit 23.CBS12007
PROX
$105.95A crankshaft bearing failure can sideline your engine and derail race day—this PROX kit eliminates that risk with OEM-specification bearings and seals engineered for reliability under extreme conditions. Whether you're rebuilding after a season or...09240295- SKU:
- 09240295
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 4-STROKE
- PRODUCT NAME:
- BEARING AND SEAL KIT
- UNITS:
- KIT
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
$105.95Qty in Cart: 0Quantity:Price:$105.95Subtotal: -
PROX Crank Bearing and Seal Kit 23.CBS12080
PROX
$55.95A worn or damaged crankshaft bearing and seal assembly compromises engine reliability and performance—especially in high-RPM or forced-induction applications where precision tolerances are critical. The PROX Crank Bearing and Seal Kit 23.CBS12080...09240296- SKU:
- 09240296
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- BEARING AND SEAL KIT
- UNITS:
- KIT
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
$55.95Qty in Cart: 0Quantity:Price:$55.95Subtotal: -
PROX Crank Bearing and Seal Kit 23.CBS13006
PROX
$116.95A crankshaft rebuild demands precision—substandard bearings and seals invite catastrophic failure and lost performance. This PROX kit eliminates guesswork by delivering OEM-spec components engineered for reliability whether you're running stock or Pro X...09240299- SKU:
- 09240299
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- STYLE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$116.95 -
PROX Crank Bearing and Seal Kit 23.CBS13087
PROX
$70.95A crank bearing and seal failure can sideline your engine—and your race season. This PROX kit eliminates guesswork by delivering factory-precise replacements engineered to exact OEM specifications, ensuring your crankshaft operates with the reliability...09240301- SKU:
- 09240301
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING AND SEAL KIT
- RIDING STYLE:
- ATV
- STYLE:
- 2-STROKE
- UNITS:
- KIT
$70.95 -
PROX Crank Bearing and Seal Kit 23.CBS23080
PROX
$70.95A worn crankshaft bearing or seal failure can destroy an entire engine build. The PROX Crank Bearing and Seal Kit 23.CBS23080 gives you a complete, OEM-specification replacement solution that restores proper bearing preload, oil retention, and crankshaft...09240321- SKU:
- 09240321
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING AND SEAL KIT
- APPLICATION:
- CRANKSHAFT
- TYPE:
- BALL
$70.95 -
PROX Crank Bearing and Seal Kit 23.CBS33094
PROX
$75.95A crankshaft rebuild is only as good as its bearings and seals—weak components here will compromise power transfer and engine longevity. The PROX 23.CBS33094 kit eliminates guesswork by delivering OEM-spec bearings and seals in a single package, ensuring...09240343- SKU:
- 09240343
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- 2-STROKE
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
$75.95Qty in Cart: 0Quantity:Price:$75.95Subtotal: -
On Sale
Wiseco Top End Bearing 20 x 25 x 21.8 mm for Polaris 440 Pro X 2001-2003 B1039
WISECO
MSRP: $23.99Now: $20.00Was: $23.99Top-end bearing wear is one of the most common culprits behind loss of compression and reduced engine efficiency in high-mileage sleds. The Wiseco B1039 is a direct OEM replacement engineered to restore full bearing function and prevent catastrophic...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
MSRP: $23.99Now: $20.00Was: $23.99Qty in Cart: 0Quantity:Price:MSRP: $23.99Now: $20.00Was: $23.99Subtotal:
