Dirt Bike Crankshafts and Parts
Dirt Bike Crankshafts & Bottom End Rebuild Kits for KTM, Husqvarna, Gas Gas & Suzuki at JJ Motorsports
Rebuild your dirt bike's bottom end with premium crankshaft assemblies and complete kits from JJ Motorsports, precision-engineered for perfect balance, maximum strength, and race-proven reliability in motocross, enduro, and trail riding. Our selection includes OEM-spec Hot Rods crankshafts and full Wossner crankshaft assemblies with rods, bearings, and seals for leak-free operation and extended engine life under extreme RPM and load. Compatible with KTM SX/EXC, Husqvarna FC/FE, Gas Gas MC/EC, and Suzuki RM-Z models, these high-quality components ensure smoother power delivery, reduced vibration, and championship-level durability in dusty, high-stress conditions. Whether refreshing a tired motor or building a stroker, Hot Rods and Wossner deliver exact OEM stroke, balanced cranks, and bolt-in fitment, and unmatched performance for 250-450cc 2-stroke and 4-stroke engines.
At JJ Motorsports, we stock the best dirt bike crankshafts and bottom-end kits from Hot Rods and Wossner with fast shipping and expert support. Free shipping over $99!
Top Dirt Bike Crankshafts & Bottom End Kits
- Wossner Crankshaft Assembly Gas Gas/Husqvarna/KTM CS2070 – Premium forged crankshaft assembly for Gas Gas, Husqvarna, and KTM 250/300 models; perfectly balanced for high-RPM reliability and smooth power.
- Wossner Crankshaft Assembly Husaberg/Husqvarna/KTM CS2012 – High-performance crankshaft for older Husaberg and current Husqvarna/KTM platforms; engineered for extreme durability and precise fit.
- Hot Rods OE Crankshaft Replacement Kit Suzuki CBK0081 – Complete OEM-spec crankshaft assembly for Suzuki RM-Z models; includes balanced crank, rod, bearings, and seals for factory performance and easy installation.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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HOT RODS Crankshaft 4071
HOT RODS
$436.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft 4071 eliminates the guesswork and machine work typically required for displacement increases. This complete assembly...09210051- SKU:
- 09210051
- Availability:
- Ships Same Business Day
- Weight:
- 4.81 LBS
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 48.90 MM
- DISPLACEMENT:
- 85 CC TO 105 CC
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
$436.95 -
HOT RODS Crankshaft - Stroker 4148
HOT RODS
$645.95A stroker crankshaft is the foundation of serious displacement gains, and the HOT RODS 4148 delivers reliable long-stroke performance without the machine work typically required for these builds. By...09210040- SKU:
- 09210040
- Availability:
- Ships Same Business Day
- Weight:
- 9.75 LBS
- DISPLACEMENT:
- 470 CC
- MODEL:
- 4-CYCLE
- TYPE:
- STROKER
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 65.00 MM
- UNITS:
- ASSEMBLY
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 65,00 MM
$645.95Qty in Cart: 0Quantity:Price:$645.95Subtotal: -
HOT RODS Crankshaft - Stroker 4149
HOT RODS
$592.95Maximize your ATV's displacement and low-end torque without extensive engine machine work. The HOT RODS Stroker 4149 crankshaft delivers proven long-stroke performance through precision engineering...09210039- SKU:
- 09210039
- Availability:
- Ships Same Business Day
- Weight:
- 6.88 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH:
- 56,60 MM
- TYPE:
- STROKER
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 264 CC
- MODEL:
- 4-CYCLE
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 56.60 MM
- UNITS:
- ASSEMBLY
$592.95 -
HOT RODS Crankshaft Assembly 4048
HOT RODS
$464.95If you're building a long-stroke engine for your ATV, you need a crankshaft assembly engineered to handle the demands of increased displacement and sustained performance. The HOT RODS Crankshaft...09210015- SKU:
- 09210015
- Availability:
- Ships Same Business Day
- Weight:
- 9.80 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MODEL:
- 4-CYCLE
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM STROKE
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 62.00 MM
- UNITS:
- ASSEMBLY
$464.95 -
HOT RODS Crankshaft Assembly 4049
HOT RODS
$489.95If you're rebuilding a high-performance four-stroke or planning a long-stroke conversion on your ATV, starting with a properly assembled crankshaft is non-negotiable. The HOT RODS Crankshaft Assembly...09210013- SKU:
- 09210013
- Availability:
- Ships Same Business Day
- Weight:
- 6.95 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MODEL:
- 4-CYCLE
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 250 CC
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 53.60 MM
$489.95 -
HOT RODS Crankshaft Assembly 4014
HOT RODS
$305.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft Assembly 4014 delivers the durability and precision you need without the machine work. This complete, factory-assembled...H117- SKU:
- H117
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
$305.95 -
HOT RODS Crankshaft Assembly 4032
HOT RODS
$476.95If you're building a high-performance ATV engine or refreshing a tired bottom end, the HOT RODS Crankshaft Assembly 4032 delivers factory-proven reliability without the machine work. This complete,...H121- SKU:
- H121
- Availability:
- Ships Same Business Day
- Weight:
- 6.56 LBS
- COLOR/FINISH:
- STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- STROKE LENGTH METRIC:
- 54.60 MM
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- MODEL:
- 2-CYCLE
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$476.95 -
HOT RODS Crankshaft 4095
HOT RODS
$397.95If you're building a long-stroke engine for your ATV, you need a crankshaft engineered to handle the increased demands of extended stroke geometry. The HOT RODS Crankshaft 4095 arrives...09210215- SKU:
- 09210215
- Availability:
- Ships Same Business Day
- Weight:
- 7.15 LBS
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 250 CC
- MODEL:
- 4-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 52.20 MM
$397.95 -
HOT RODS Crankshaft Kit CBK0119
HOT RODS
$595.95If you're building a high-performance engine or restoring a classic, you need a crankshaft assembly that's manufactured to exacting standards and ready to handle increased displacement or RPM. The...09210356- SKU:
- 09210356
- Availability:
- Ships Same Business Day
- Weight:
- 9.00 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$595.95 -
HOT RODS Crankshaft Kit CBK0120
HOT RODS
$993.95The HOT RODS Crankshaft Kit CBK0120 delivers factory-spec performance with the durability of a purpose-built racing component. Whether you're rebuilding after catastrophic failure or upgrading for...09210357- SKU:
- 09210357
- Availability:
- Ships Same Business Day
- Weight:
- 13.65 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$993.95Qty in Cart: 0Quantity:Price:$993.95Subtotal: -
HOT RODS Crankshaft Kit CBK0124
HOT RODS
$768.95If you're building a high-performance engine or refreshing a tired crankshaft, the HOT RODS Crankshaft Kit CBK0124 delivers factory-matched reliability with performance that meets or exceeds OEM...09210358- SKU:
- 09210358
- Availability:
- Ships Same Business Day
- Weight:
- 13.08 LBS
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- UNITS:
- KIT
$768.95 -
HOT RODS Crankshaft 4068
HOT RODS
$158.50If you're building a long-stroke engine for your ATV, you need a crankshaft engineered specifically for the application—not a compromised OEM unit that limits potential. The HOT RODS Crankshaft 4068...09210076- SKU:
- 09210076
- Availability:
- Ships Same Business Day
- Weight:
- 4.78 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 85 CC
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
- UNITS:
- ASSEMBLY
- MODEL:
- 2-CYCLE
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$158.50 -
HOT RODS Crankshaft - Stroker 4166
HOT RODS
$316.95A stroker crankshaft transforms your ATV's engine into a powerhouse by increasing displacement and torque output without sacrificing reliability. The HOT RODS 4166 eliminates the machine work and...09210077- SKU:
- 09210077
- Availability:
- Ships Same Business Day
- Weight:
- 4.60 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 88 CC TO 103.5 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- ASSEMBLY
- MATERIAL:
- 4140 STEEL
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH:
- 47,80 MM
- STROKE LENGTH METRIC:
- 47.80 MM
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- STROKER
$316.95 -
Wiseco Kawasaki KX250 2002-2004 Crankshaft Kit WPC128A
WISECO
$479.95Your KX250's bottom end is the foundation of reliable power delivery—factory cranks wear out, and a compromised crankshaft kills both performance and engine longevity. The Wiseco WPC128A is a...09210108- SKU:
- 09210108
- Availability:
- Ships Same Business Day
- Weight:
- 12.96 LBS
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal: -
Wiseco Suzuki RM125 2004-2008 Crankshaft Kit WPC135
WISECO
$399.95A worn or compromised crankshaft directly limits your RM125's power delivery and reliability—especially under the demands of competitive riding. The Wiseco WPC135 restores your engine to factory...09210110- SKU:
- 09210110
- Availability:
- Ships Same Business Day
- Weight:
- 9.43 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$399.95Qty in Cart: 0Quantity:Price:$399.95Subtotal: -
Wiseco Crankshaft Kit for Yamaha WR250F 2003-2013 WPC141
WISECO
$621.95A worn or failing crankshaft compromises engine reliability and performance across the board—power delivery suffers, bearing wear accelerates, and catastrophic failure becomes a real risk. The Wiseco...09210111- SKU:
- 09210111
- Availability:
- Ships Same Business Day
- Weight:
- 10.11 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$621.95 -
Wiseco Crankshaft Kit for 2003-2005 Yamaha YZ 450 F WPC139
WISECO
$624.95A crankshaft is the backbone of any high-performance engine rebuild, and the Wiseco WPC139 is engineered for the demands of serious YZ450F riders. This complete bottom-end kit arrives...09210112- SKU:
- 09210112
- Availability:
- Ships Same Business Day
- Weight:
- 11.78 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- STROKE LENGTH METRIC:
- 63.40 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$624.95Qty in Cart: 0Quantity:Price:$624.95Subtotal: -
MOOSE RACING Crankcase Bearing and Seal Kit 24-1022
MOOSE RACING
$53.95A worn or damaged crankshaft bearing compromises engine reliability and performance—especially critical in 2-stroke engines where bearing failure can cause catastrophic damage. The MOOSE RACING...A241022- SKU:
- A241022
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- BEARING KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- CRANK
$53.95 -
On Sale
PROX PRO-X Crank Seal Kit 42.4105
PROX
MSRP: $10.95Now: $8.00Was: $10.95A failing crank seal compromises oil containment and invites contamination into your engine's most critical rotating assembly. This complete kit eliminates the guesswork during rebuilds by providing...094481- SKU:
- 094481
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
MSRP: $10.95Now: $8.00Was: $10.95 -
On Sale
PROX PRO-X Crank Seal Kit 42.4208
PROX
MSRP: $22.95Now: $17.00Was: $22.95A compromised crank seal is a silent killer—it allows oil to weep past critical bearing surfaces, leading to catastrophic engine failure if left unaddressed. The PROX PRO-X Crank Seal Kit 42.4208...094484- SKU:
- 094484
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
MSRP: $22.95Now: $17.00Was: $22.95
