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!
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- Price
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On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB007
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A crankshaft rebuild demands precision and reliability—this kit delivers both with Japanese-manufactured bearings and seals engineered to Kawasaki specifications. Whether you're completing a full...09240659- SKU:
- 09240659
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB009
VINTCO
MSRP: $47.95Now: $44.59Was: $47.95A complete crankshaft installation requires precision-matched bearings and seals that can handle sustained high RPM loads without compromise. The VINTCO Main Bearing and Seal Kit delivers OEM-quality...09240660- SKU:
- 09240660
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $47.95Now: $44.59Was: $47.95Qty in Cart: 0Quantity:Price:MSRP: $47.95Now: $44.59Was: $47.95Subtotal: -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB011
VINTCO
MSRP: $47.95Now: $44.59Was: $47.95A compromised crankshaft bearing or seal can silently degrade engine performance and lead to catastrophic failure. The VINTCO KMB011 Main Bearing and Seal Kit eliminates guesswork by providing...09240661- SKU:
- 09240661
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $47.95Now: $44.59Was: $47.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB010
VINTCO
MSRP: $47.95Now: $44.59Was: $47.95A worn crankshaft bearing or failing seal will compromise engine efficiency, increase operating temperatures, and accelerate internal wear—ultimately shortening your engine's lifespan. The VINTCO...09240662- SKU:
- 09240662
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $47.95Now: $44.59Was: $47.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB008
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A reliable crankshaft installation depends on precision-engineered bearings and seals that can withstand sustained load and RPM cycles. The VINTCO Main Bearing and Seal Kit supplies OEM-quality...09240663- SKU:
- 09240663
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Maico KMB028
VINTCO
MSRP: $109.95Now: $102.25Was: $109.95A worn or damaged main bearing and seal assembly compromises crankshaft stability, leading to excessive runout, oil leakage, and accelerated engine wear. The VINTCO KMB028 kit delivers a complete...09240664- SKU:
- 09240664
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
MSRP: $109.95Now: $102.25Was: $109.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Maico KMB026
VINTCO
MSRP: $69.95Now: $65.05Was: $69.95A quality crankshaft installation depends on precision-engineered bearings and seals that can handle sustained RPMs and load cycling without degradation. The VINTCO Main Bearing and Seal Kit for...09240665- SKU:
- 09240665
- Availability:
- Ships Same Business Day
- Weight:
- 1.54 LBS
MSRP: $69.95Now: $65.05Was: $69.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Maico KMB027
VINTCO
MSRP: $79.95Now: $74.35Was: $79.95A properly sealed and supported crankshaft is foundational to engine reliability and longevity. This VINTCO Main Bearing and Seal Kit supplies OEM-quality Japanese bearings and seals engineered to...09240666- SKU:
- 09240666
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
MSRP: $79.95Now: $74.35Was: $79.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB014
VINTCO
MSRP: $34.95Now: $32.50Was: $34.95A complete crankshaft installation demands precision-matched bearings and seals—any compromise here risks catastrophic engine failure and costly downtime. The VINTCO KMB014 Main Bearing and Seal Kit...09240667- SKU:
- 09240667
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
MSRP: $34.95Now: $32.50Was: $34.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB015
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A quality main bearing and seal kit is fundamental to a reliable crankshaft assembly—it directly impacts engine longevity, oil retention, and overall performance stability. The VINTCO KMB015 delivers...09240668- SKU:
- 09240668
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB016
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A proper crankshaft installation depends on quality main bearings and seals—failure here leads to catastrophic engine damage and costly rebuilds. The VINTCO KMB016 kit delivers OEM-spec components...09240669- SKU:
- 09240669
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB022
VINTCO
MSRP: $44.95Now: $41.80Was: $44.95A complete crankshaft installation demands precision-matched bearings and seals—this kit eliminates the guesswork by bundling everything you need in one package. VINTCO's OEM-quality Japanese...09240672- SKU:
- 09240672
- Availability:
- Ships Same Business Day
- Weight:
- 1.76 LBS
MSRP: $44.95Now: $41.80Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $41.80Was: $44.95Subtotal: -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB017
VINTCO
MSRP: $32.95Now: $30.64Was: $32.95A compromised crankshaft bearing or seal will quickly degrade engine reliability and performance—making a quality bearing and seal kit essential for any serious engine rebuild. The VINTCO KMB017...09240673- SKU:
- 09240673
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
MSRP: $32.95Now: $30.64Was: $32.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB020
VINTCO
MSRP: $61.95Now: $57.61Was: $61.95A worn or damaged crankshaft bearing and seal assembly compromises engine reliability, efficiency, and longevity—especially in high-performance applications where precision tolerances are critical...09240674- SKU:
- 09240674
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
MSRP: $61.95Now: $57.61Was: $61.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Suzuki KMB021
VINTCO
MSRP: $37.95Now: $35.29Was: $37.95Your Suzuki's crankshaft requires precise bearing clearances and reliable seals to maintain oil pressure and prevent catastrophic engine failure. This complete VINTCO kit eliminates the guesswork of...09240675- SKU:
- 09240675
- Availability:
- Ships Same Business Day
- Weight:
- 1.76 LBS
MSRP: $37.95Now: $35.29Was: $37.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Yamaha KMB023
VINTCO
MSRP: $24.95Now: $23.20Was: $24.95A complete crankshaft installation demands precision-engineered bearings and seals that can withstand the extreme pressures and temperatures of high-performance racing. The VINTCO Main Bearing and...09240676- SKU:
- 09240676
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
MSRP: $24.95Now: $23.20Was: $24.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Yamaha KMB025
VINTCO
MSRP: $61.95Now: $57.61Was: $61.95A complete crankshaft installation depends on precision-engineered bearings and seals that can handle sustained RPM loads without compromising engine integrity. This VINTCO kit eliminates the...09240677- SKU:
- 09240677
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $61.95Now: $57.61Was: $61.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Yamaha KMB024
VINTCO
MSRP: $24.95Now: $23.20Was: $24.95A worn or improperly sealed crankshaft is a direct path to catastrophic engine failure. The VINTCO KMB024 Main Bearing and Seal Kit delivers factory-quality components engineered specifically for...09240678- SKU:
- 09240678
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
MSRP: $24.95Now: $23.20Was: $24.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Yamaha KMB029
VINTCO
MSRP: $44.95Now: $41.80Was: $44.95A complete crankshaft installation requires precision-matched bearings and seals that can handle sustained RPM loads without compromise. This VINTCO kit eliminates the guesswork by pairing...09240679- SKU:
- 09240679
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
MSRP: $44.95Now: $41.80Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $41.80Was: $44.95Subtotal: -
On Sale
PROX Crankshaft Bearing/Seal Kit - Honda 23.CBS14005
PROX
MSRP: $138.95Now: $110.00Was: $138.95A worn crankshaft bearing or compromised seal will rapidly degrade engine performance and reliability. This ProX kit replaces all critical bearing and seal components in one complete package,...09240701- SKU:
- 09240701
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $138.95Now: $110.00Was: $138.95
