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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WSM Top-End Rebuild Kit - Platinum Series - Standard 010-824-10P
WSM
$510.93Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030749- SKU:
- 09030749
- Availability:
- Ships Same Business Day
- Weight:
- 5.50 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM SERIES
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
$510.93 -
KIBBLEWHITE Piston Kit 30-33100
KIBBLEWHITE
$660.02Kit includes the following, 2 intake titanium retainers, 2 exhaust titanium retainers, 2 Intake CrSi valve springs, 2 exhaust CrSi valve springs, 2 intake H.T. steel basewashers, 2 exhaust H.T. steel basewashers, 2 intake Black Diamond™ valves, 2 exhaust...09031595- SKU:
- 09031595
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32700
KIBBLEWHITE
$660.02The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves, Conversion to Black Diamond™ stainless steel valves offers up to twice the life of the stock titanium...09031584- SKU:
- 09031584
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32900
KIBBLEWHITE
$660.02The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves, Conversion to Black Diamond™ stainless steel valves offers up to twice the life of the stock titanium...09031585- SKU:
- 09031585
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32600
KIBBLEWHITE
$660.02The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves, Conversion to Black Diamond™ stainless steel valves offers up to twice the life of the stock titanium...09031587- SKU:
- 09031587
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 80-81900
KIBBLEWHITE
$736.36The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves, Conversion to Black Diamond™ stainless steel valves offers up to twice the life of the stock titanium...09031588- SKU:
- 09031588
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 95.00 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$736.36 -
KIBBLEWHITE Piston System 80-82000
KIBBLEWHITE
$736.36The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves, Conversion to Black Diamond™ stainless steel valves offers up to twice the life of the stock titanium...09031589- SKU:
- 09031589
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 95.00 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$736.36 -
Wiseco Engine Rebuild Kit 2002-2023 Suzuki RM85 PWR166-100
WISECO
$464.95The WISECO Engine Rebuild Kit PWR166-100 provides everything you need for a comprehensive engine overhaul. Designed for both performance and longevity, this kit ensures your engine runs smoothly with high-quality components tailored for 4-stroke and...09031618- SKU:
- 09031618
- Availability:
- Ships Same Business Day
- Weight:
- 8.20 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$464.95 -
Wiseco Engine Rebuild Kit 52.00mm Bore for 2006-2011 KTM 105 SX PWR176-100
WISECO
$519.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR176-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures your engine performs at its best, featuring premium components for reliability and longevity. ...09031622- SKU:
- 09031622
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$519.95Qty in Cart: 0Quantity:Price:$519.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 2005-2007 54mm Bore PWR177-100
WISECO
$554.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR177-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures your engine runs smoothly and efficiently with premium components tailored for durability and...09031623- SKU:
- 09031623
- Availability:
- Ships Same Business Day
- Weight:
- 9.95 LBS
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$554.95 -
Wiseco Engine Rebuild Kit for 2013-2017 KTM 85 SX 17/14 PWR178-100
WISECO
$679.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR178-100, 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...09031624- SKU:
- 09031624
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$679.95 -
Wiseco Engine Rebuild Kit for Honda CR250R 2002-2004 PWR132-100
WISECO
$659.95Revitalize your CR250 with the WISECO Engine Kit, meticulously crafted for 2002-2004 models. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring top performance and reliability. Designed for durability, each...09031517- SKU:
- 09031517
- Availability:
- Ships Same Business Day
- Weight:
- 12.85 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
$659.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ125 2005-2020 PWR163-100
WISECO
$529.95The WISECO Engine Kit for YZ125 offers a comprehensive solution for a complete engine rebuild, ensuring your bike runs like new. Each component is meticulously designed and tested for maximum durability and performance, making it the ideal choice for...09031541- SKU:
- 09031541
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$529.95 -
Wiseco Engine Kit Kawasaki KX100 2006 PWR164-100
WISECO
$479.95Revitalize your KX100 with the WISECO Engine Kit, meticulously engineered for a complete top and bottom-end rebuild. This comprehensive kit ensures optimal performance and longevity, featuring a crankshaft and rod assembly that meets rigorous durability...09031542- SKU:
- 09031542
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 52.50 MM
- DISPLACEMENT:
- 100 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$479.95 -
Wiseco Engine Rebuild Kit for 2010-2013 Honda CRF250R PWR168-100
WISECO
$864.95Revitalize your CRF250 with the WISECO Engine Kit, meticulously designed for a complete top and bottom-end rebuild. Each component, from the crankshaft to the seals, is rigorously inspected to ensure maximum performance and durability, making it the...09031546- SKU:
- 09031546
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$864.95 -
Wiseco Engine Rebuild Kit for 2005-2007 Honda CR250R PWR172-100
WISECO
$694.95Revitalize your CRF250R with the WISECO Engine Kit, meticulously crafted for a complete engine rebuild. This comprehensive kit combines top-quality components to ensure optimal performance and longevity, making it the perfect choice for both enthusiasts...09031548- SKU:
- 09031548
- Availability:
- Ships Same Business Day
- Weight:
- 13.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- GP SERIES PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$694.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 50 SX 2009-2012 WR101-158
WRENCH RABBIT
$632.95Revitalize your KTM WR101-158 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 to ensure optimal performance and longevity of your engine. ...09031259- SKU:
- 09031259
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$632.95 -
Wrench Rabbit Engine Kit Suzuki RMZ250 2004 WR101-070
WRENCH RABBIT
$1,011.95Revitalize your Suzuki 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 durability, making it the perfect solution for...09031006- SKU:
- 09031006
- Availability:
- Ships Same Business Day
- Weight:
- 12.15 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,011.95 -
Wrench Rabbit Engine Kit Suzuki RM-Z250 2007-2009 WR101-073
WRENCH RABBIT
$1,121.95Revitalize your Suzuki engine with the WRENCH RABBIT Engine Kit, designed to provide everything you need for a thorough and professional rebuild. This all-in-one kit ensures top performance and reliability, featuring high-quality components tailored for...09031008- SKU:
- 09031008
- Availability:
- Ships Same Business Day
- Weight:
- 13.50 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$1,121.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Suzuki RMZ250 2010-2012 WR101-074
WRENCH RABBIT
$1,121.95Revitalize your Suzuki 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 with...09031009- SKU:
- 09031009
- Availability:
- Ships Same Business Day
- Weight:
- 12.45 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,121.95
