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
-
Wrench Rabbit Engine Rebuild Kit Kawasaki KX65 2006-2012 WR101-051
WRENCH RABBIT
$592.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, a comprehensive solution designed for a seamless and professional engine rebuild. This all-in-one kit includes high-quality components that ensure durability and performance, making it the ideal...09030989- SKU:
- 09030989
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- WRENCH RABBIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95Qty in Cart: 0Quantity:Price:$592.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2003-2004 Suzuki RM250 WR101-063
WRENCH RABBIT
$946.95Revitalize your Suzuki with the WRENCH RABBIT Engine Kit, a comprehensive solution designed for a professional-grade rebuild. This all-in-one kit includes high-quality components to ensure your engine runs smoothly and efficiently, making it the perfect...09031001- SKU:
- 09031001
- Availability:
- Ships Same Business Day
- Weight:
- 14.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$946.95 -
Wrench Rabbit Engine Rebuild Kit 2002-2004 Honda CR250R WR101-015
WRENCH RABBIT
$828.95Revitalize your Honda engine with the WRENCH RABBIT Engine Kit, designed for a comprehensive and professional rebuild. This all-in-one kit includes everything you need for a seamless installation, ensuring your engine runs at peak performance. With...09030955- SKU:
- 09030955
- Availability:
- Ships Same Business Day
- Weight:
- 14.10 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$828.95 -
Vertex Engine Rebuild Kit for 2016-2017 Honda CRF250R WR101-219
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 the essential components to ensure your engine performs at its best, making it the perfect choice for...09030959- SKU:
- 09030959
- Availability:
- Ships Same Business Day
- Weight:
- 12.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-819-14
WSM
$330.79Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030122- SKU:
- 09030122
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.91 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
$330.79 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-827-14
WSM
$241.36Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030125- SKU:
- 09030125
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
$241.36 -
On Sale
Wiseco Engine Rebuild Kit for 2002-2003 Kawasaki KX250 PWR128-100
WISECO
MSRP: $659.95Now: $561.00Was: $659.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR128-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit offers all the essential components needed for a complete engine overhaul, ensuring optimal performance and...09031607- SKU:
- 09031607
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
MSRP: $659.95Now: $561.00Was: $659.95Qty in Cart: 0Quantity:Price:MSRP: $659.95Now: $561.00Was: $659.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for 2006 KTM 250 SX 66.40mm PWR179-100
WISECO
MSRP: $831.10Now: $706.00Was: $831.10Revitalize your engine with the WISECO Engine Rebuild Kit PWR179-100, designed for both performance and reliability. This comprehensive kit includes everything needed for a full engine overhaul, ensuring your machine runs at its best. With high-quality...09031660- SKU:
- 09031660
- Availability:
- Ships Same Business Day
- Weight:
- 13.10 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
MSRP: $831.10Now: $706.00Was: $831.10 -
On Sale
Wiseco Engine Rebuild Kit for KTM 300 XC 2008-2015 PWR238-101
WISECO
MSRP: $967.55Now: $822.00Was: $967.55Revitalize your engine with the WISECO Engine Rebuild Kit PWR238-101, designed for optimal performance and longevity. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring your machine runs like new. Whether you’re...09031666- SKU:
- 09031666
- Availability:
- Ships Same Business Day
- Weight:
- 14.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $967.55Now: $822.00Was: $967.55 -
On Sale
Wrench Rabbit Complete Engine Rebuild Kit for KTM 200 EXC 1998-1999 WR00032
WRENCH RABBIT
MSRP: $1,052.95Now: $674.00Was: $1,052.95Revitalize 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
MSRP: $1,052.95Now: $674.00Was: $1,052.95 -
Vertex Complete Engine Rebuild Kit for Yamaha YZ250 2003-2025 WR101-082
WRENCH RABBIT
$867.95Revitalize 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
$867.95 -
Wrench Rabbit Yamaha YZ250F 2003-2004 Complete Engine Rebuild Kit WR101-083
WRENCH RABBIT
$1,157.95Revitalize 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
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2005-2007 Yamaha YZ250F WR101-084
WRENCH RABBIT
$1,157.95Revitalize 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
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ250F 2008-2013 WR101-085
WRENCH RABBIT
$1,157.95Revitalize 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
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit Yamaha YZ450F 2003-2005 WR101-086
WRENCH RABBIT
$1,183.95Revitalize 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
$1,183.95 -
Wrench Rabbit Engine Kit Yamaha YZ125 1998-2000 WR101-093
WRENCH RABBIT
$1,211.95Revitalize 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
$1,211.95 -
Wrench Rabbit Engine Rebuild Kit for Yamaha YZ450F 2010-2013 WR101-088
WRENCH RABBIT
$1,249.95Revitalize 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
$1,249.95 -
Wrench Rabbit Yamaha YZ85 2002-2016 Complete Engine Rebuild Kit WR101-089
WRENCH RABBIT
$564.95Revitalize 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
$564.95 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-817-12
WSM
$223.48Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030035- SKU:
- 09030035
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 82.50 MM
- PISTON SIZE METRIC:
- +0.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-817-10
WSM
$223.48Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030034- SKU:
- 09030034
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48
