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 Honda CRF450X 2005-2009 2012-2016 WR101-179
WRENCH RABBIT
$1,132.95Revitalize your Honda engine with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components, ensuring your engine runs smoothly and efficiently, whether you're a seasoned...09031307- SKU:
- 09031307
- Availability:
- Ships Same Business Day
- Weight:
- 17.10 LBS
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,132.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX250 2014-2016 WR101-175
WRENCH RABBIT
$1,211.95Revitalize your Kawasaki WR101-175 with the WRENCH RABBIT Engine Kit, designed for enthusiasts seeking a comprehensive rebuild solution. This all-in-one kit provides everything you need for a professional-grade restoration, ensuring optimal performance...09031308- SKU:
- 09031308
- Availability:
- Ships Same Business Day
- Weight:
- 12.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,211.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2015 Kawasaki KX450F WR101-174
WRENCH RABBIT
$1,211.95Revitalize your Kawasaki with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components to restore your engine's performance, ensuring durability and reliability on the track...09031309- SKU:
- 09031309
- Availability:
- Ships Same Business Day
- Weight:
- 16.05 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,211.95 -
Wrench Rabbit Kawasaki KX85 2014-2025 Complete Engine Rebuild Kit WR101-170
WRENCH RABBIT
$788.95Revitalize your Kawasaki engine with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all the essential components to ensure optimal performance and durability, making it the ideal choice for...09031310- SKU:
- 09031310
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$788.95 -
Wrench Rabbit Engine Rebuild Kit for 2013-2015 Suzuki RM-Z250 WR101-169
WRENCH RABBIT
$1,249.95Revitalize your Suzuki WR101-169 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This all-inclusive kit provides everything you need to restore your engine to peak performance, ensuring durability and reliability on...09031314- SKU:
- 09031314
- Availability:
- Ships Same Business Day
- Weight:
- 12.60 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,249.95 -
Wrench Rabbit Complete Engine Rebuild Kit Yamaha YZ250F 2014-2015 WR101-168
WRENCH RABBIT
$1,183.95Revitalize your Yamaha WR101-168 with the WRENCH RABBIT Engine Kit, a comprehensive solution designed for a professional-grade rebuild. This all-in-one kit includes everything you need to restore peak performance, ensuring reliability and longevity for...09031315- SKU:
- 09031315
- Availability:
- Ships Same Business Day
- Weight:
- 12.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,183.95 -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX250 1992 WR101-111
WRENCH RABBIT
$867.95Revitalize your Kawasaki WR101-111 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes everything you need to restore your engine's performance, ensuring reliability and efficiency on every...09031085- SKU:
- 09031085
- Availability:
- Ships Same Business Day
- Weight:
- 14.15 LBS
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$867.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX250 2004 WR101-115
WRENCH RABBIT
$895.95Revitalize your Kawasaki WR101-115 with the WRENCH RABBIT Engine Kit, your all-in-one solution for a professional-grade rebuild. This comprehensive kit includes everything you need to ensure your engine runs smoothly and efficiently, making it ideal for...09031089- SKU:
- 09031089
- Availability:
- Ships Same Business Day
- Weight:
- 14.40 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$895.95 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-827-10
WSM
$241.36Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030123- SKU:
- 09030123
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- BORE SIZE METRIC:
- 81.00 MM
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$241.36 -
Wiseco Engine Rebuild Kit for 1992-1996 Honda CR250R PWR101-100
WISECO
$659.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR101-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring optimal performance and longevity...09031596- SKU:
- 09031596
- Availability:
- Ships Same Business Day
- Weight:
- 14.10 LBS
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$659.95 -
Wiseco Engine Rebuild Kit for Honda CR125R 1992-1997 PWR116A-101
WISECO
$549.95Transform your engine with the WISECO Engine Rebuild Kit PWR116A-101, designed for both 4-stroke and 2-stroke applications. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring peak performance and reliability...09031600- SKU:
- 09031600
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$549.95Qty in Cart: 0Quantity:Price:$549.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 2001-2002 PWR116A-104
WISECO
$554.95Revitalize your CR125 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit includes meticulously crafted components to ensure optimal performance and reliability, making it perfect for both enthusiasts and competitive riders...09031496- SKU:
- 09031496
- Availability:
- Ships Same Business Day
- Weight:
- 4.35 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- UNITS:
- KIT
$554.95 -
Wiseco Engine Kit for Kawasaki KX65 2000-2005 PWR117-100
WISECO
$459.95Revitalize your KX65 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit ensures optimal performance and longevity, featuring meticulously inspected components for reliability and strength. Complete top and bottom-end...09031497- SKU:
- 09031497
- Availability:
- Ships Same Business Day
- Weight:
- 7.40 LBS
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 44.50 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$459.95 -
Wiseco Engine Rebuild Kit Kawasaki KX100 1998-2005 PWR119-102
WISECO
$479.95Revitalize your KX100 with the WISECO Engine Kit, meticulously crafted for a complete engine rebuild. This kit ensures optimal performance and longevity, featuring high-quality components that have been rigorously inspected for durability. ...09031499- SKU:
- 09031499
- Availability:
- Ships Same Business Day
- Weight:
- 8.00 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 52.50 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- DISPLACEMENT:
- 100 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$479.95 -
Wiseco Engine Rebuild Kit Kawasaki KX85 2001-2005 PWR119-104
WISECO
$469.95Revitalize your KX85 with the WISECO Engine Kit, engineered for unparalleled performance and reliability. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring your bike runs at its best. Designed with precision, the...09031500- SKU:
- 09031500
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
$469.95 -
Wiseco Engine Rebuild Kit for 2001-2003 Suzuki RM125 PWR121-100
WISECO
$529.95Revitalize your RM125 with the WISECO Engine Kit, specifically designed for models from 2001 to 2003. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring peak performance and reliability. With rigorous...09031501- SKU:
- 09031501
- Availability:
- Ships Same Business Day
- Weight:
- 10.30 LBS
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$529.95 -
Wiseco Engine Rebuild Kit Yamaha YZ85 2002-2018 PWR123-100
WISECO
$454.95Revitalize your YZ85 with the WISECO Engine Kit, expertly crafted for a complete engine rebuild. This comprehensive kit ensures optimal performance and longevity, featuring meticulously inspected components for reliable power delivery. Complete top...09031503- SKU:
- 09031503
- Availability:
- Ships Same Business Day
- Weight:
- 7.60 LBS
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$454.95 -
Wiseco Engine Rebuild Kit for 2001 Yamaha YZ125 PWR125-100
WISECO
$539.95Revitalize your YZ125 with the WISECO Engine Kit, meticulously crafted for a complete engine rebuild. This comprehensive kit ensures top performance and durability, featuring a precision-engineered crankshaft and rod assembly, alongside essential...09031505- SKU:
- 09031505
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
$539.95 -
Wiseco Engine Rebuild Kit Yamaha YZ125 2003-2004 PWR125-102
WISECO
$534.95Revitalize your YZ125 with the WISECO Engine Kit, meticulously engineered for a complete top and bottom-end rebuild. This comprehensive kit ensures your engine performs at its peak, featuring high-quality components that guarantee durability and...09031507- SKU:
- 09031507
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- UNITS:
- KIT
$534.95 -
Wiseco Engine Rebuild Kit Yamaha YZ250 1999-2000 PWR126-100
WISECO
$644.95This comprehensive engine kit is designed specifically for the YZ250 models from 1999 to 2000, providing everything you need for a complete rebuild. With a focus on quality and performance, the kit includes meticulously inspected crankshaft and rod...09031508- SKU:
- 09031508
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$644.95
