Dirt Bike Engine Rebuild Kits
Dirt Bike Engine Rebuild Kits for Kawasaki KX100, KTM XC-W 250 & Honda CRF250R at JJ Motorsports
Revive your dirt bike's engine to factory-fresh performance with premium rebuild kits from JJ Motorsports, featuring forged pistons, crankshafts, bearings, seals, and gaskets for superior compression, reduced vibration, and long-term reliability in motocross, enduro, and trail riding. Our selection includes complete top- and bottom-end kits designed for precise fitment, optimal oil flow, and enhanced power delivery without custom machining. Compatible with popular models like Kawasaki KX100, KTM XC/XC-W 250, Husqvarna TE250, and Honda CRF250R, these high-quality components from trusted brands ensure leak-free assembly, better heat management, and race-ready durability in dusty, high-RPM conditions. From Wiseco's comprehensive KX100 kits with hour meters to Vertex's all-in-one KTM rebuilds and Athena's high-performance CRF pistons, get everything needed for a pro-level refresh—pistons, rings, bearings, and gaskets—to restore throttle snap, efficiency, and confidence on every rip.
Shop brands like Wiseco, Vertex, and Athena for race-proven quality. Explore related categories such as dirt bike piston and ring kits for top-end focus or dirt bike engine for cylinders and valves.
Top Dirt Bike Engine Rebuild Kits
- Wiseco Engine Rebuild Kit 52.50 mm Kawasaki KX100 1995-2013 PWR173-100 – Comprehensive top- and bottom-end kit with high-quality crankshaft, rod assembly, main bearings, seals, gaskets, and hour meter bracket for Kawasaki KX100 models; ensures optimal performance and easy maintenance.
- VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091 – All-in-one rebuild kit with Vertex piston, Hot Rods crankshaft, bearings/seals, transmission kit, and complete gaskets; perfect for professional top- and bottom-end refresh on KTM and Husqvarna 250cc models.
- ATHENA Piston Kit with Gaskets - 76.76 mm - CRF250R P5F0768245003B – High-performance 76.76 mm forged aluminum piston kit with rings, gaskets, and coatings for reduced friction; engineered for Honda CRF250R 4-stroke off-road with superior airflow and longevity.
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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Wrench Rabbit Complete Engine Rebuild Kit for 2010-2013 Honda CRF250R WR101-024
WRENCH RABBIT
$1,092.95Revitalize your Honda engine with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components, ensuring you have everything needed for a successful restoration, from pistons to...09030964- SKU:
- 09030964
- Availability:
- Ships Same Business Day
- Weight:
- 12.91 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
Wrench Rabbit Engine Rebuild Kit for 2008 Kawasaki KX450F WR101-044
WRENCH RABBIT
$1,211.95Transform your Kawasaki 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 durability on every ride...09030981- SKU:
- 09030981
- Availability:
- Ships Same Business Day
- Weight:
- 17.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
$1,211.95 -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX65 2002-2004 WR101-049
WRENCH RABBIT
$1,211.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, a comprehensive solution designed for a seamless and professional rebuild. This all-in-one kit includes high-quality components that ensure your engine runs smoothly and efficiently, making it...09030983- SKU:
- 09030983
- Availability:
- Ships Same Business Day
- Weight:
- 16.30 LBS
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,211.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2004-2011 KTM 105 SX WR101-053
WRENCH RABBIT
$767.95Revitalize your KTM with the WRENCH RABBIT Engine Kit, a comprehensive solution for a professional-grade rebuild. This all-in-one kit includes everything you need to restore your engine's performance, ensuring reliability and longevity for your ride. ...09030991- SKU:
- 09030991
- Availability:
- Ships Same Business Day
- Weight:
- 8.35 LBS
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$767.95Qty in Cart: 0Quantity:Price:$767.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit Kawasaki KX100 2006-2013 WR101-134
WRENCH RABBIT
$711.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, designed for a comprehensive and professional rebuild. This all-in-one solution includes high-quality components to ensure optimal performance and durability, making it the perfect choice for...09031108- SKU:
- 09031108
- Availability:
- Ships Same Business Day
- Weight:
- 8.15 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$711.95Qty in Cart: 0Quantity:Price:$711.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2013-2014 Kawasaki KX450F WR101-144
WRENCH RABBIT
$1,156.95Revitalize your Kawasaki WR101-144 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all the essential components, ensuring your engine performs at its best. Experience unmatched...09031114- SKU:
- 09031114
- Availability:
- Ships Same Business Day
- Weight:
- 16.05 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,156.95Qty in Cart: 0Quantity:Price:$1,156.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for Kawasaki KX80 1991-1997 PWR119-101
WISECO
MSRP: $474.95Now: $404.00Was: $474.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR119-101, designed for both 4-stroke and 2-stroke applications. This comprehensive kit provides everything you need for a complete rebuild, ensuring optimal performance and reliability. Each...09031605- SKU:
- 09031605
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
MSRP: $474.95Now: $404.00Was: $474.95Qty in Cart: 0Quantity:Price:MSRP: $474.95Now: $404.00Was: $474.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit Kawasaki KX80 1998-2000 PWR119-103
WISECO
MSRP: $474.95Now: $404.00Was: $474.95Upgrade your engine's performance with the WISECO Engine Rebuild Kit PWR119-103, designed for both 4-stroke and 2-stroke engines. This comprehensive kit includes all essential components for a complete rebuild, ensuring durability and reliability for...09031606- SKU:
- 09031606
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $474.95Now: $404.00Was: $474.95Qty in Cart: 0Quantity:Price:MSRP: $474.95Now: $404.00Was: $474.95Subtotal: -
On Sale
Wiseco Garage Buddy Engine Rebuild Kit for 2016-2018 Yamaha YZ250F PWR216-101
WISECO
MSRP: $989.95Now: $841.00Was: $989.95Revitalize your engine with the WISECO PWR216-101 Rebuild Kit, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures your engine operates at peak performance with high-quality components that meet rigorous durability...09031663- SKU:
- 09031663
- Availability:
- Ships Same Business Day
- Weight:
- 11.55 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 77.00 MM
MSRP: $989.95Now: $841.00Was: $989.95Qty in Cart: 0Quantity:Price:MSRP: $989.95Now: $841.00Was: $989.95Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-808-10P
WSM
$238.39Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030743- SKU:
- 09030743
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- MODEL:
- PLATINUM SERIES
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
$238.39Qty in Cart: 0Quantity:Price:$238.39Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - 1 mm 010-809-14P
WSM
$323.56Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030748- SKU:
- 09030748
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- BORE SIZE METRIC:
- 88.91 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$323.56Qty in Cart: 0Quantity:Price:$323.56Subtotal:
