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
-
On Sale
ATHENA Piston Kit with Gaskets - 96.96 mm - YZ450F P5F0970197004B
ATHENA
MSRP: $229.95Now: $207.00Was: $229.95Piston Kit with Gaskets - 96.96 mm - YZ450F Made of high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance, The smooth...09031769- SKU:
- 09031769
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 450 CC
- MODEL:
- B
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 96.96 MM
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
MSRP: $229.95Now: $207.00Was: $229.95Qty in Cart: 0Quantity:Price:MSRP: $229.95Now: $207.00Was: $229.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-810-12
WSM
$240.24Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081012- SKU:
- 01081012
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 76.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- REBUILD KIT
$240.24Qty in Cart: 0Quantity:Price:$240.24Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-812-12
WSM
$195.81Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081212- SKU:
- 01081212
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- EACH
$195.81Qty in Cart: 0Quantity:Price:$195.81Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-820-10
WSM
$221.36Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01082010- SKU:
- 01082010
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 80.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
$221.36Qty in Cart: 0Quantity:Price:$221.36Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-825-12
WSM
$238.39Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01082512- SKU:
- 01082512
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 81.50 MM
- PISTON MATERIAL:
- ALUMINUM
$238.39Qty in Cart: 0Quantity:Price:$238.39Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-832-10
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01083210- SKU:
- 01083210
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 81.00 MM
$229.87Qty in Cart: 0Quantity:Price:$229.87Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-841-10P
WSM
$391.70Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01084110P- SKU:
- 01084110P
- Availability:
- Ships Same Business Day
- Weight:
- 4.80 LBS
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 79.87 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$391.70Qty in Cart: 0Quantity:Price:$391.70Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-815-10
WSM
$178.77Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets01081510- SKU:
- 01081510
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 76.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$178.77Qty in Cart: 0Quantity:Price:$178.77Subtotal: -
KIBBLEWHITE Piston System 30-32500
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...09031586- SKU:
- 09031586
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 94.00 MM
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- TYPE:
- TOP END
$660.02Qty in Cart: 0Quantity:Price:$660.02Subtotal: -
Wiseco Engine Rebuild Kit for 1997-2001 Honda CR250R PWR101-101
WISECO
$664.95Revitalize your CR250 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 a durable crankshaft and rod assembly that meets rigorous...09031491- SKU:
- 09031491
- Availability:
- Ships Same Business Day
- Weight:
- 13.80 LBS
- 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
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$664.95 -
Wiseco Engine Rebuild Kit KTM 65 SX 2003-2008 PWR161A-100
WISECO
$479.95Revitalize your ride with the WISECO Engine Kit, expertly designed for the 65SX model from 2003 to 2008. This comprehensive kit provides all the essential components needed for a complete engine rebuild, ensuring optimal performance and longevity. ...09031538- SKU:
- 09031538
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 65 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal: -
Wiseco Engine Rebuild Kit for Kawasaki KX85 2006-2013 PWR164-101
WISECO
$469.95Revitalize your KX85 with the WISECO Engine Rebuild Kit, meticulously crafted for performance and reliability. This comprehensive kit contains everything you need for a complete engine overhaul, ensuring your bike runs smoothly and efficiently for years...09031543- SKU:
- 09031543
- Availability:
- Ships Same Business Day
- Weight:
- 7.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 85 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
$469.95 -
Wiseco Engine Rebuild Kit Honda CRF250R 2014-2015 PWR168-101
WISECO
$864.95Upgrade your motorcycle's performance with the WISECO Engine Kit, specifically designed for the CRF250 models from 2014 to 2015. This comprehensive kit includes all essential components for a complete engine rebuild, ensuring your bike runs smoothly and...09031547- SKU:
- 09031547
- Availability:
- Ships Same Business Day
- Weight:
- 11.75 LBS
$864.95Qty in Cart: 0Quantity:Price:$864.95Subtotal: -
Wiseco Engine Rebuild Kit Kawasaki KX85 2014-2020 48.5mm PWR173-101
WISECO
$569.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR173-101, 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...09031682- SKU:
- 09031682
- Availability:
- Ships Same Business Day
- Weight:
- 3.52 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
$569.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 125 SX 2007-2015 WR101-216
WRENCH RABBIT
$1,013.95Revitalize your KTM WR101-128 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes all essential components, ensuring your engine performs at its best. Experience enhanced reliability and...09031102- SKU:
- 09031102
- Availability:
- Ships Same Business Day
- Weight:
- 11.55 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95Qty in Cart: 0Quantity:Price:$1,013.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ85 2002-2016 WR101-089
WRENCH RABBIT
$1,183.95Revitalize your Yamaha WR101-146 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 durability, making it...09031116- SKU:
- 09031116
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$1,183.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2013 Suzuki RMZ450 WR101-149
WRENCH RABBIT
$1,156.95Revitalize your Suzuki WR101-149 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes high-quality components that ensure top performance and longevity, making it the ideal choice for...09031118- SKU:
- 09031118
- Availability:
- Ships Same Business Day
- Weight:
- 15.00 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,156.95Qty in Cart: 0Quantity:Price:$1,156.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for 2013-2016 Honda CRF450R WR101-150
WRENCH RABBIT
$1,132.95Transform your Honda WR101-150 with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This all-inclusive kit features high-quality components to ensure your engine runs smoothly and efficiently, making it the ultimate choice...09031119- SKU:
- 09031119
- Availability:
- Ships Same Business Day
- Weight:
- 16.30 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,132.95 -
Wiseco Engine Rebuild Kit Suzuki RM250 2005-2010 PWR165B-100
WISECO
$664.95Revitalize your RM250 with the WISECO Engine Kit, designed for a comprehensive top and bottom-end rebuild. This all-inclusive kit ensures your engine performs at its peak, featuring a meticulously crafted crankshaft and rod assembly for exceptional...09031545- SKU:
- 09031545
- Availability:
- Ships Same Business Day
- Weight:
- 13.95 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal: -
Wiseco Engine Rebuild Kit 2002-2006 KTM 125 SX PWR153-101
WISECO
$664.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR153-101, designed for both performance and longevity. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring your machine runs like new. With premium...09031616- SKU:
- 09031616
- Availability:
- Ships Same Business Day
- Weight:
- 10.55 LBS
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal:
