Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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Wossner Piston Kit Honda CR85R 2003-2007 8105DA
WOSSNER
$112.00Experience unparalleled performance with the WOSSNER Piston Kit 8105DA, designed for enthusiasts who demand the best in their 2-stroke engines. Crafted from premium materials and engineered in Germany, this piston kit enhances your engine's efficiency...09104835- SKU:
- 09104835
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 47.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 84.7 CC
- PISTON SIZE METRIC:
- 47.45 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit 47.46mm for 2003-2007 Honda CR85R 8105DB
WOSSNER
$112.00Experience unparalleled performance with the WOSSNER Piston Kit 8105DB, expertly engineered for 2-stroke engines. Crafted from premium materials, this piston kit enhances your engine's efficiency while ensuring durability and reduced friction for a...09104836- SKU:
- 09104836
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 47.46 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 47.51 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 84.7 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit KTM 85 SX 2003-2025 8147DA
WOSSNER
$112.00Experience superior performance with the WOSSNER Piston Kit 8147DA, designed specifically for high-demand 2-stroke applications. Engineered in Germany, this piston kit combines advanced materials and innovative design to deliver exceptional durability...09104847- SKU:
- 09104847
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PISTON SIZE METRIC:
- 46.95 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- FORGED
$112.00 -
Wossner Piston Kit 46.96mm for KTM 85 SX 2003-2023 8147DB
WOSSNER
$112.00Elevate your engine's performance with the WOSSNER Piston Kit 8147DB, expertly crafted for 2-stroke engines. This premium kit combines cutting-edge engineering with high-quality materials, ensuring enhanced durability, reduced friction, and a quieter...09104848- SKU:
- 09104848
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 46.96 MM
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 47.01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00 -
Wossner Piston Kit KTM 450 SX-F 2013-2022 8873DB
WOSSNER
$244.00Enhance your KTM SXF 450's performance with the WOSSNER Piston Kit, meticulously engineered for optimal power and efficiency. Crafted from premium materials, this piston kit ensures durability and reduced friction, making it an ideal choice for both...09106126- SKU:
- 09106126
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- BORE SIZE METRIC:
- 95.01 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$244.00 -
Wossner Piston Kit Kawasaki KX450F 2013-2014 12.5:1 CR 8890DA
WOSSNER
$204.00Enhance your Kawasaki KX 450 F's performance with the WOSSNER Piston Kit, expertly engineered for optimal power and reliability. This kit includes everything you need for a seamless installation, ensuring your ride delivers exceptional performance and...09106130- SKU:
- 09106130
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$204.00 -
Wossner Piston Kit KTM 450 EXC-F 2021 8898DA
WOSSNER
$214.00Experience enhanced performance and reliability with the WOSSNER Piston Kit, specifically designed for KTM and Husqvarna 2-stroke engines. Crafted from high-quality materials, this piston kit ensures reduced friction and noise, providing a smoother ride...09106131- SKU:
- 09106131
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
$214.00 -
Wossner Piston Kit Yamaha YZ125 1994-1996 53.95mm 8116DB
WOSSNER
$122.00Experience unparalleled performance with the WOSSNER Piston Kit 8116DB, designed specifically for 2-stroke engines. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit offers enhanced durability and efficiency, ensuring your engine...09105539- SKU:
- 09105539
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.01 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
$122.00 -
Wossner Piston Kit Yamaha YZ125 1986-1988 55.94mm 8118DA
WOSSNER
$132.00Experience unparalleled performance with the WOSSNER Piston Kit 8118DA, designed specifically for 2-stroke engines. Crafted from premium materials, this piston kit enhances engine efficiency while minimizing friction and noise, ensuring a smoother ride...09105540- SKU:
- 09105540
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 55.94 MM
- TYPE:
- SINGLE RING
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$132.00 -
Wrench Rabbit Complete Engine Rebuild Kit for KTM 200 EXC 1998-1999 WR00032
WRENCH RABBIT
$974.95Revitalize your KTM with the WRENCH RABBIT Engine Kit WR00032, designed for a complete engine overhaul. This comprehensive kit ensures optimal performance and reliability, providing everything you need for a seamless rebuild. Elevate your riding...09031639- SKU:
- 09031639
- Availability:
- Ships Same Business Day
- Weight:
- 11.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- UNITS:
- KIT
$974.95 -
Vertex Complete Engine Rebuild Kit for Yamaha YZ250 2003-2025 WR101-082
WRENCH RABBIT
$803.95Revitalize your Yamaha WR with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components to ensure your engine performs at its best, making it the perfect solution for both...09031017- SKU:
- 09031017
- Availability:
- Ships Same Business Day
- Weight:
- 13.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$803.95 -
Wrench Rabbit Yamaha YZ250F 2003-2004 Complete Engine Rebuild Kit WR101-083
WRENCH RABBIT
$1,071.95Revitalize your Yamaha engine with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes everything you need to restore your engine to peak performance, ensuring reliability and longevity on every...09031018- SKU:
- 09031018
- Availability:
- Ships Same Business Day
- Weight:
- 13.05 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,071.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2005-2007 Yamaha YZ250F WR101-084
WRENCH RABBIT
$1,071.95Revitalize your Yamaha WR with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes high-quality components that ensure optimal performance and longevity, making it the perfect choice for...09031019- SKU:
- 09031019
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,071.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ250F 2008-2013 WR101-085
WRENCH RABBIT
$1,071.95Revitalize your Yamaha WR with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes high-quality components to ensure optimal performance and longevity, making it the perfect choice for...09031020- SKU:
- 09031020
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,071.95 -
Wrench Rabbit Complete Engine Rebuild Kit Yamaha YZ450F 2003-2005 WR101-086
WRENCH RABBIT
$1,095.95Revitalize your Yamaha with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes everything you need for optimal performance, ensuring your engine runs like new. With high-quality components from...09031021- SKU:
- 09031021
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,095.95 -
Wrench Rabbit Engine Kit Yamaha YZ125 1998-2000 WR101-093
WRENCH RABBIT
$1,121.95Revitalize your Yamaha WR with the WRENCH RABBIT Engine Kit, a comprehensive solution for a professional-grade rebuild. This all-in-one kit includes high-quality components necessary for restoring peak performance and reliability, ensuring your bike runs...09031022- SKU:
- 09031022
- Availability:
- Ships Same Business Day
- Weight:
- 15.75 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,121.95 -
Wrench Rabbit Engine Rebuild Kit for Yamaha YZ450F 2010-2013 WR101-088
WRENCH RABBIT
$1,156.95Revitalize your Yamaha WR with the WRENCH RABBIT Engine Kit, designed for enthusiasts seeking a complete and professional rebuild. This all-in-one kit includes high-quality components to ensure your engine runs at peak performance, making it an ideal...09031023- SKU:
- 09031023
- Availability:
- Ships Same Business Day
- Weight:
- 16.35 LBS
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,156.95 -
Wrench Rabbit Yamaha YZ85 2002-2016 Complete Engine Rebuild Kit WR101-089
WRENCH RABBIT
$522.95Revitalize your Yamaha with the WRENCH RABBIT Engine Kit, designed for a complete and professional rebuild. This all-in-one solution provides high-quality components to ensure your engine runs smoothly and efficiently, enhancing performance and longevity...09031024- SKU:
- 09031024
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$522.95 -
WSM Crankshaft Assembly 010-1017WSM
WSM
$708.90Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210224- SKU:
- 09210224
- Availability:
- Ships Same Business Day
- Weight:
- 20.95 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$708.90 -
WSM Crankshaft Assembly 010-1018WSM
WSM
$810.90Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210225- SKU:
- 09210225
- Availability:
- Ships Same Business Day
- Weight:
- 25.20 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$810.90
