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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Wiseco Engine Rebuild Kit for 2004-2012 KTM 85 SX PWR162-100
WISECO
$469.95Revitalize your 85SX with the WISECO Engine Kit, engineered for peak performance and reliability. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring your bike runs smoothly and efficiently. With precision-crafted...09031540- SKU:
- 09031540
- Availability:
- Ships Same Business Day
- Weight:
- 7.70 LBS
- BORE SIZE METRIC:
- 47.00 MM
- FEATURES:
- GP SERIES PISTON
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$469.95Qty in Cart: 0Quantity:Price:$469.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for KTM 150 SX 2014-2015 WR101-173
WRENCH RABBIT
$1,092.95Revitalize your KTM engine with the WRENCH RABBIT Engine Kit, a comprehensive solution that includes everything you need for a professional-grade rebuild. Designed for enthusiasts and professionals alike, this kit ensures optimal performance and...09031313- SKU:
- 09031313
- Availability:
- Ships Same Business Day
- Weight:
- 10.70 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,092.95Qty in Cart: 0Quantity:Price:$1,092.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-827-12
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030124- SKU:
- 09030124
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 81.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
$229.87Qty in Cart: 0Quantity:Price:$229.87Subtotal: -
Wiseco Engine Rebuild Kit for 1986-1991 Honda CR80R PWR115-100
WISECO
$479.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR115-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures optimal performance and longevity with high-quality components tailored to meet your engine's needs...09031597- SKU:
- 09031597
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal: -
Wiseco Engine Rebuild Kit for 1992-2002 Honda CR80R PWR115-101
WISECO
$474.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR115-101, designed for both 4-stroke and 2-stroke engines. This comprehensive kit includes premium components that ensure optimal performance and longevity, making it the ideal choice for...09031598- SKU:
- 09031598
- Availability:
- Ships Same Business Day
- Weight:
- 8.00 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$474.95 -
Wiseco Engine Rebuild Kit for 1998-1999 Honda CR125R PWR116A-102
WISECO
$549.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR116A-102, 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 reliability...09031601- SKU:
- 09031601
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- BORE SIZE METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$549.95Qty in Cart: 0Quantity:Price:$549.95Subtotal: -
Wiseco Engine Rebuild Kit for 2005-2007 Suzuki RM-Z450 95.50mm PWR142-100
WISECO
$967.84The WISECO Engine Rebuild Kit PWR142-100 is your all-in-one solution for a complete engine overhaul. Designed for both 4-stroke and 2-stroke engines, this kit ensures optimal performance and longevity with premium components tailored for durability and...09031614- SKU:
- 09031614
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 95.50 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PRODUCT NAME:
- REBUILD KIT
$967.84Qty in Cart: 0Quantity:Price:$967.84Subtotal: -
Wiseco Engine Rebuild Kit for 2003-2004 Honda CR85R PWR115-103
WISECO
$464.95Revitalize your CR85R with the complete WISECO Engine Kit, meticulously designed for a flawless rebuild. This kit ensures your engine performs at its peak with high-quality components that guarantee durability and reliability on the track. ...09031495- SKU:
- 09031495
- Availability:
- Ships Same Business Day
- Weight:
- 7.95 LBS
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
$464.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ80 1993-2001 PWR122-100
WISECO
$474.95Revitalize your YZ80 with the WISECO Engine Kit, designed for a comprehensive rebuild that enhances performance and reliability. This all-inclusive kit ensures your engine operates at peak efficiency, featuring meticulously crafted components that meet...09031502- SKU:
- 09031502
- Availability:
- Ships Same Business Day
- Weight:
- 7.80 LBS
- DISPLACEMENT:
- 80 CC
- FEATURES:
- PROLITE® PISTON
- BORE SIZE METRIC:
- 47.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$474.95Qty in Cart: 0Quantity:Price:$474.95Subtotal: -
Wiseco Engine Rebuild Kit for 1998-2000 Yamaha YZ125 PWR124-100
WISECO
$539.95Revitalize your YZ125 with the WISECO Engine Kit, specifically designed for models from 1998 to 2000. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring optimal performance and longevity. Complete top...09031504- SKU:
- 09031504
- Availability:
- Ships Same Business Day
- Weight:
- 9.70 LBS
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$539.95Qty in Cart: 0Quantity:Price:$539.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ125 2002 PWR125-101
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 operates at peak performance with components that guarantee durability and reliability. ...09031506- SKU:
- 09031506
- Availability:
- Ships Same Business Day
- Weight:
- 9.75 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$534.95Qty in Cart: 0Quantity:Price:$534.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ250 2002 PWR127-101
WISECO
$649.95Revitalize your YZ250 with the comprehensive WISECO Engine Kit, expertly crafted for a complete engine rebuild. This kit ensures optimal performance and longevity with high-quality components that have undergone rigorous inspection and testing. ...09031510- SKU:
- 09031510
- Availability:
- Ships Same Business Day
- Weight:
- 13.00 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- OVERBORE METRIC:
- STANDARD
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$649.95Qty in Cart: 0Quantity:Price:$649.95Subtotal: -
Wiseco Engine Kit for Kawasaki KX250 1993 PWR128-102
WISECO
$669.95Revitalize your KX250 with the WISECO Engine Kit, specifically designed for models from 1993 to 2001. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring enhanced performance and reliability on every ride. ...09031511- SKU:
- 09031511
- 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
$669.95 -
Wiseco Engine Rebuild Kit for Kawasaki KX60 1985-2003 PWR130-100
WISECO
$459.95Revitalize your KX60 with the WISECO Engine Kit, designed for a comprehensive rebuild that ensures peak performance. This kit includes meticulously inspected components for both the top and bottom end, providing everything you need for a seamless...09031512- SKU:
- 09031512
- Availability:
- Ships Same Business Day
- Weight:
- 14.83 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 60 CC
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 43.00 MM
- FEATURES:
- STANDARD PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
$459.95Qty in Cart: 0Quantity:Price:$459.95Subtotal: -
Wiseco Engine Rebuild Kit for Suzuki RM125 2004-2008 PWR135-100
WISECO
$564.95Revitalize your RM125 with the WISECO Engine Kit, specifically designed for models from 2004 to 2010. This comprehensive kit provides everything needed for a complete engine rebuild, ensuring optimal performance and reliability. With meticulously...09031520- SKU:
- 09031520
- Availability:
- Ships Same Business Day
- Weight:
- 10.00 LBS
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
$564.95Qty in Cart: 0Quantity:Price:$564.95Subtotal: -
Wiseco Engine Rebuild Kit Honda CRF250R 2004-2007 PWR143-100
WISECO
$889.95Revitalize your CRF250 with the WISECO Engine Kit, designed for a comprehensive engine rebuild. This kit includes high-quality components meticulously crafted to enhance performance and reliability, ensuring your bike runs smoothly on any terrain. ...09031531- SKU:
- 09031531
- Availability:
- Ships Same Business Day
- Weight:
- 5.05 LBS
$889.95 -
Wiseco Engine Rebuild Kit Yamaha YZ450F 2006-2009 PWR151-100
WISECO
$994.95Revitalize your YZ450F with the WISECO Engine Kit, offering everything you need for a complete engine rebuild. Designed for durability and performance, this comprehensive kit ensures your bike runs smoothly and efficiently on every ride. Complete...09031535- SKU:
- 09031535
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
$994.95 -
Wiseco Engine Rebuild Kit KTM 125 SX 2007-2015 PWR153-102
WISECO
$664.95Revitalize your KTM/TC125 with the WISECO Engine Kit, meticulously crafted for a seamless rebuild experience. This comprehensive kit includes all essential components for both top and bottom-end repairs, ensuring your engine operates at peak performance...09031536- SKU:
- 09031536
- Availability:
- Ships Same Business Day
- Weight:
- 10.65 LBS
- DISPLACEMENT:
- 125 CC
- FEATURES:
- PROLITE® PISTON
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 54.00 MM
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2004-2005 KTM 300 EXC WR00002
WRENCH RABBIT
$1,052.95Revitalize your KTM engine with the WRENCH RABBIT Engine Kit WR00002, designed for a comprehensive rebuild. This all-inclusive kit ensures optimal performance and durability, featuring high-quality components tailored for your specific model. Whether...09031629- SKU:
- 09031629
- Availability:
- Ships Same Business Day
- Weight:
- 15.35 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,052.95Qty in Cart: 0Quantity:Price:$1,052.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2016-2017 Honda CRF250R WR101-219
WRENCH RABBIT
$1,092.95Transform your Honda's performance with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components to ensure your engine runs like new, making it the perfect choice for...09031549- SKU:
- 09031549
- Availability:
- Ships Same Business Day
- Weight:
- 13.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,092.95
