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
-
Wiseco Engine Rebuild Kit Yamaha YZ250 2001 PWR127-100
WISECO
$644.95Revitalize your YZ250 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit includes meticulously inspected components to ensure peak performance and longevity, making it the perfect choice for both enthusiasts and...09031509- SKU:
- 09031509
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$644.95 -
Wiseco Engine Rebuild Kit Honda CRF450R 2002-2006 PWR138-100
WISECO
$974.95Revitalize your CRF450 with the WISECO Engine Kit, expertly designed for a complete engine rebuild. This comprehensive kit includes high-quality components that ensure optimal performance and longevity, making it the perfect choice for both casual riders...09031524- SKU:
- 09031524
- Availability:
- Ships Same Business Day
- Weight:
- 15.40 LBS
$974.95 -
Wiseco Engine Rebuild Kit for 2007 Honda CRF450R PWR138-101
WISECO
$974.95Revitalize your CRF450 with the WISECO Engine Kit, meticulously engineered for a comprehensive rebuild. This all-inclusive package ensures your engine operates at peak performance, featuring high-quality components designed for durability and reliability...09031525- SKU:
- 09031525
- Availability:
- Ships Same Business Day
- Weight:
- 15.05 LBS
$974.95 -
Wiseco Engine Rebuild Kit Yamaha YZ450F 2003-2005 PWR139-100
WISECO
$969.95Revitalize your YZ450 with the WISECO Engine Kit, meticulously engineered for optimal performance and longevity. This comprehensive kit includes all essential top and bottom-end components, ensuring a seamless engine rebuild that meets the highest...09031526- SKU:
- 09031526
- Availability:
- Ships Same Business Day
- Weight:
- 13.80 LBS
$969.95Qty in Cart: 0Quantity:Price:$969.95Subtotal: -
Wiseco Engine Rebuild Kit for 2003-2004 Yamaha YZ250F PWR140-100
WISECO
$889.95Revitalize your YZ250F with the WISECO Engine Kit, meticulously designed for a comprehensive rebuild. This kit includes high-quality components to ensure your engine performs at its best, featuring a durable crankshaft and rod assembly that guarantees...09031527- SKU:
- 09031527
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$889.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ250F 2005-2007 PWR140-101
WISECO
$889.95Revitalize your YZ250F with the WISECO Engine Kit, meticulously crafted to ensure peak performance and reliability. This comprehensive kit includes everything you need for a full engine rebuild, guaranteeing both durability and efficiency in every ride...09031528- SKU:
- 09031528
- Availability:
- Ships Same Business Day
- Weight:
- 11.35 LBS
$889.95Qty in Cart: 0Quantity:Price:$889.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ250F 2008-2011 PWR140-102
WISECO
$894.95Revitalize your YZ250F with the WISECO Engine Kit, designed for a comprehensive rebuild with top-quality components. This kit ensures optimal performance and longevity, featuring a meticulously crafted crankshaft and rod assembly, along with essential...09031529- SKU:
- 09031529
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$894.95 -
Wiseco Engine Rebuild Kit for 2006 Kawasaki KX250F PWR144-101
WISECO
$884.95Revitalize your KX250F with the WISECO Engine Kit, specifically designed for the 2006 model. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring optimal performance and reliability on the track. Complete top...09031532- SKU:
- 09031532
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$884.95 -
Wiseco Engine Rebuild Kit for Kawasaki KX250F 2007-2008 PWR144-102
WISECO
$894.95Revitalize your KX250F with the WISECO Engine Kit, engineered for a complete top and bottom-end rebuild. This comprehensive kit ensures your engine runs smoothly, featuring meticulously inspected components for optimal performance and durability. ...09031533- SKU:
- 09031533
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$894.95 -
Wiseco Engine Rebuild Kit Honda CRF250R 2008-2009 PWR159-100
WISECO
$879.95Elevate your bike's performance with the WISECO Engine Kit, designed specifically for the CRF250 models from 2008 to 2009. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring reliability and longevity on the track...09031537- SKU:
- 09031537
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$879.95 -
Wiseco Engine Rebuild Kit for KTM 125 SX 2016-2017 PWR213-100
WISECO
$884.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR213-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures optimal performance and longevity, featuring high-quality components meticulously crafted for...09031672- SKU:
- 09031672
- Availability:
- Ships Same Business Day
- Weight:
- 8.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$884.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2006-2008 KTM 50 SX WR00003
WRENCH RABBIT
$592.95Revitalize your engine with the WRENCH RABBIT Engine Kit WR00003. This comprehensive rebuild kit is designed to restore performance and reliability, ensuring your engine runs smoothly for miles to come. With all essential components included, you can...09031630- SKU:
- 09031630
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95 -
WRENCH RABBIT Engine Kit - Kawasaki WR00004
WRENCH RABBIT
$1,013.95Complete engine rebuild kit, Includes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission bearings, countershaft bushing/seal kit, wrist pin bearing, cam chain and counter...09031631- SKU:
- 09031631
- Availability:
- Ships Same Business Day
- Weight:
- 15.65 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX60 1985-2003 WR00005
WRENCH RABBIT
$564.95Revitalize your Kawasaki engine with the WRENCH RABBIT Engine Kit, designed for a comprehensive rebuild that ensures optimal performance and longevity. This all-inclusive kit features high-quality components tailored for a seamless installation, making...09031632- SKU:
- 09031632
- Availability:
- Ships Same Business Day
- Weight:
- 7.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$564.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ250F 2016-2018 WR00008
WRENCH RABBIT
$1,132.95Revitalize your engine with the WRENCH RABBIT Engine Kit WR00008, designed for a comprehensive rebuild that ensures peak performance and longevity. This all-inclusive kit provides everything you need for a seamless engine restoration, making it ideal for...09031634- SKU:
- 09031634
- Availability:
- Ships Same Business Day
- Weight:
- 12.30 LBS
- RIDING STYLE:
- UTV
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,132.95 -
Wrench Rabbit Engine Rebuild Kit for 2014-2015 KTM 250 SX-F WR101-161
WRENCH RABBIT
$1,315.95Revitalize your KTM WR101-161 with the WRENCH RABBIT Engine Kit, designed for those seeking a comprehensive and professional rebuild. This all-in-one solution provides everything you need to restore your engine's performance and reliability, ensuring you...09031262- SKU:
- 09031262
- Availability:
- Ships Same Business Day
- Weight:
- 12.75 LBS
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,315.95 -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX100 2014-2016 WR101-163
WRENCH RABBIT
$711.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components, ensuring your engine runs smoothly and efficiently. Experience enhanced performance...09031264- SKU:
- 09031264
- Availability:
- Ships Same Business Day
- Weight:
- 8.10 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$711.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 200 EXC 2000-2002 WR101-180
WRENCH RABBIT
$1,013.95Revitalize your engine with the WRENCH RABBIT Engine Rebuild Kit WR101-180, your all-in-one solution for a professional-grade rebuild. This comprehensive kit includes top-quality components designed to restore your engine's performance and reliability,...09031436- SKU:
- 09031436
- Availability:
- Ships Same Business Day
- Weight:
- 11.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95 -
Wrench Rabbit Engine Rebuild Kit 2014-2016 Yamaha YZ450F WR101-181
WRENCH RABBIT
$1,249.95Revitalize your engine with the WRENCH RABBIT Engine Rebuild Kit WR101-181, your all-in-one solution for a professional-grade rebuild. This comprehensive kit includes high-quality components designed to restore performance and reliability, ensuring your...09031437- SKU:
- 09031437
- Availability:
- Ships Same Business Day
- Weight:
- 16.25 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,249.95 -
Wrench Rabbit Engine Rebuild Kit 2004-2007 Yamaha YFZ450 WR101-186
WRENCH RABBIT
$1,052.95Revitalize your engine with the WRENCH RABBIT Engine Rebuild Kit WR101-186, designed for those who demand quality and performance. This comprehensive kit includes all the essential components for a complete engine rebuild, ensuring your machine runs like...09031438- SKU:
- 09031438
- Availability:
- Ships Same Business Day
- Weight:
- 10.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,052.95
