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
-
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 every seal specification needed for a proper, leak-free...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 delivers OEM-equivalent seals with the precision...094484- SKU:
- 094484
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
MSRP: $22.95Now: $17.00Was: $22.95 -
On Sale
PROX PRO-X Crank Seal Kit 42.4288
PROX
MSRP: $9.95Now: $8.00Was: $9.95A compromised crank seal can silently undermine engine reliability, leading to oil leaks, contamination, and catastrophic failure during critical race moments or long-term ownership. The PROX PRO-X Crank Seal Kit 42.4288 delivers OEM-quality seals in a...094487- SKU:
- 094487
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $9.95Now: $8.00Was: $9.95 -
Wiseco Crankshaft with Bearing and Gasket for 2004-2009 Honda CRF250R WPC159
WISECO
$532.95A worn or damaged crankshaft compromises engine reliability and performance—especially in high-RPM racing applications where precision is non-negotiable. The Wiseco WPC159 crankshaft assembly delivers a complete bottom-end solution with factory-assembled...09210140- SKU:
- 09210140
- Availability:
- Ships Same Business Day
- Weight:
- 10.06 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 52.20 MM
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$532.95 -
Wiseco Crankshaft Assembly for 2004-2007 Kawasaki KX250F WPC144
WISECO
$621.95A quality crankshaft assembly is the foundation of engine reliability and performance—without it, you're risking catastrophic failure and lost race time. The Wiseco WPC144 delivers factory-assembled precision and durability right out of the box,...09210141- SKU:
- 09210141
- Availability:
- Ships Same Business Day
- Weight:
- 10.10 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$621.95Qty in Cart: 0Quantity:Price:$621.95Subtotal: -
Wiseco Crankshaft Assembly with Bearings and Gasket for 1995-2005 Kawasaki KX100 WPC119
WISECO
$344.95A crankshaft is the foundation of your engine's reliability and performance—a worn or damaged unit will rob you of power and risk catastrophic failure. The Wiseco WPC119 is factory-assembled and precision-trued to OEM specifications, giving you the...09210089- SKU:
- 09210089
- Availability:
- Ships Same Business Day
- Weight:
- 6.31 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- STROKE LENGTH METRIC:
- 45.80 MM
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Crankshaft Kit for Honda CR250R 1992-2001 WPC101
WISECO
$466.95The Wiseco WPC101 crankshaft kit is engineered for CR250R racers who demand reliability under extreme combustion loads and sustained high RPM operation. This factory-assembled unit arrives precision-trued to OEM specifications, eliminating the guesswork...09210090- SKU:
- 09210090
- Availability:
- Ships Same Business Day
- Weight:
- 12.72 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- STROKE LENGTH METRIC:
- 72.00 MM
$466.95 -
Wiseco Crankshaft Kit for Kawasaki KX65 2000-2005 and Suzuki RM65 2003-2005 WPC117
WISECO
$332.95A worn or damaged crankshaft limits your engine's ability to deliver consistent power and reliability. The Wiseco Crankshaft Kit gives you a factory-assembled, precision-engineered solution that restores—or exceeds—OEM performance while eliminating the...09210093- SKU:
- 09210093
- Availability:
- Ships Same Business Day
- Weight:
- 5.28 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- UNITS:
- KIT
$332.95 -
Wiseco Crankshaft Assembly with Bearings and Gasket for 2003-2004 Honda CR85R WPC115
WISECO
$314.95If you're rebuilding a 2003-2004 Honda CR85R, the crankshaft is the foundation of your engine's reliability and performance. The Wiseco Crankshaft Assembly eliminates the guesswork by delivering a factory-assembled, precision-trued unit that meets OEM...09210094- SKU:
- 09210094
- Availability:
- Ships Same Business Day
- Weight:
- 6.70 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- STROKE LENGTH METRIC:
- 47.80 MM
$314.95Qty in Cart: 0Quantity:Price:$314.95Subtotal: -
Wiseco Crankshaft Kit for 2001-2003 Suzuki RM125 WPC121
WISECO
$432.95If you're rebuilding a 2001-2003 RM125 or pushing your existing bottom-end to its limits, a quality crankshaft kit isn't optional—it's essential. The Wiseco WPC121 eliminates the guesswork of sourcing individual components by delivering a...09210095- SKU:
- 09210095
- Availability:
- Ships Same Business Day
- Weight:
- 9.23 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
$432.95 -
Wiseco Crankshaft Assembly for 2001-2004 Yamaha YZ125 WPC125
WISECO
$410.95A worn or damaged crankshaft directly compromises engine reliability and power delivery on your YZ125. This Wiseco assembly eliminates guesswork with factory-assembled, precision-trued components that meet OEM specifications out of the box. Whether...09210096- SKU:
- 09210096
- Availability:
- Ships Same Business Day
- Weight:
- 8.02 LBS
- STROKE LENGTH METRIC:
- 54.50 MM
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$410.95 -
Wiseco Crankshaft Assembly with Bearing and Gasket for Yamaha YZ250 2003-2025 WPC134
WISECO
$466.95A worn or damaged crankshaft assembly compromises engine reliability, throttle response, and overall power delivery—especially critical in high-RPM racing applications. The Wiseco WPC134 is a factory-assembled, precision-engineered complete bottom-end...09210097- SKU:
- 09210097
- Availability:
- Ships Same Business Day
- Weight:
- 12.16 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$466.95Qty in Cart: 0Quantity:Price:$466.95Subtotal: -
Wiseco Crankshaft Assembly with Bearings and Gasket for 2003-2012 Yamaha YZ250F WPC140
WISECO
$577.95If you're rebuilding a YZ250F bottom end, you need a crankshaft assembly that can handle the demands of consistent high-RPM operation without compromise. The Wiseco WPC140 delivers factory-grade precision with reinforced components specifically...09210098- SKU:
- 09210098
- Availability:
- Ships Same Business Day
- Weight:
- 8.65 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
$577.95Qty in Cart: 0Quantity:Price:$577.95Subtotal: -
Wiseco Yamaha YZ80 1993-2001 Crankshaft Kit WPC122
WISECO
$343.95A worn or failing crankshaft will tank your YZ80's reliability and power delivery—this Wiseco kit gives you a factory-assembled, precision-engineered replacement that meets OEM specifications and handles sustained high-RPM operation. Built with...09210101- SKU:
- 09210101
- Availability:
- Ships Same Business Day
- Weight:
- 6.24 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$343.95 -
Wiseco Crankshaft Assembly with Bearings and Gasket for 2001-2002 Yamaha YZ250 WPC127
WISECO
$477.95A worn or damaged crankshaft will cripple your YZ250's power delivery and reliability on the track. The Wiseco WPC127 assembly delivers factory-spec precision with OEM-matched tolerances, so you get consistent performance lap after lap without the...09210102- SKU:
- 09210102
- Availability:
- Ships Same Business Day
- Weight:
- 12.30 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$477.95 -
Wiseco Crankshaft Assembly with Bearings and Gasket for 1999-2000 Yamaha YZ250 WPC126
WISECO
$477.95A worn or damaged crankshaft compromises your YZ250's bottom-end reliability and power delivery—especially critical if you're pushing hard at the track or trail. This Wiseco complete assembly eliminates guesswork with factory-spec precision and...09210104- SKU:
- 09210104
- Availability:
- Ships Same Business Day
- Weight:
- 12.18 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$477.95 -
Wiseco Crankshaft Kit for 2006-2009 Yamaha YZ450F WPC151
WISECO
$624.95A crankshaft is the foundation of engine reliability and performance—when it fails, your entire engine fails. The Wiseco Crankshaft Kit for 2006-2009 Yamaha YZ450F delivers factory-matched precision with reinforced components engineered to handle...09210432- SKU:
- 09210432
- Availability:
- Ships Same Business Day
- Weight:
- 12.27 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 63.40 MM
- UNITS:
- KIT
$624.95Qty in Cart: 0Quantity:Price:$624.95Subtotal: -
Wiseco Crankshaft Kit with Gasket 2001-2015 KTM 125 SX WPC153
WISECO
$621.95A crankshaft failure leaves you sidelined. The Wiseco WPC153 kit delivers a complete bottom-end solution—crankshaft, bearings, gaskets, and seals all precision-assembled to OEM specs—so you can rebuild with confidence and get back to winning. Whether...09210434- SKU:
- 09210434
- Availability:
- Ships Same Business Day
- Weight:
- 9.97 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- STROKE LENGTH METRIC:
- 54.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$621.95 -
WSM Crankshaft Assembly 010-1028WSM
WSM
$908.90A quality crankshaft assembly is the backbone of reliable engine performance, directly impacting power delivery, durability, and overall engine longevity. The WSM 010-1028WSM is precision-engineered to meet or exceed OEM specifications, making it an...09210483- SKU:
- 09210483
- Availability:
- Ships Same Business Day
- Weight:
- 28.95 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$908.90 -
WSM Crankshaft Assembly 010-1028-01WSM
WSM
$1,165.75A quality crankshaft is the backbone of engine reliability and performance—if yours is worn, damaged, or you're rebuilding from the ground up, this WSM assembly delivers the precision you need without compromise. Trued to OEM specifications and ready for...09210484- SKU:
- 09210484
- Availability:
- Ships Same Business Day
- Weight:
- 42.80 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$1,165.75
