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
-
Wrench Rabbit Complete Engine Rebuild Kit for Honda CRF450X 2005-2009 2012-2016 WR101-179
WRENCH RABBIT
$1,132.95An engine rebuild is a critical investment in your Honda CRF450X's longevity and performance. The Wrench Rabbit Complete Engine Rebuild Kit eliminates guesswork by bundling every component you need—pistons, crankshaft, bearings, seals, and gaskets—into...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
$1,132.95Qty in Cart: 0Quantity:Price:$1,132.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX250 2014-2016 WR101-175
WRENCH RABBIT
$1,211.95When your Kawasaki KX250 two-stroke demands a complete overhaul, settling for partial solutions risks reliability and performance. The Wrench Rabbit Complete Engine Rebuild Kit delivers everything needed for a professional-grade restoration in one...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
$1,211.95Qty in Cart: 0Quantity:Price:$1,211.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2015 Kawasaki KX450F WR101-174
WRENCH RABBIT
$1,211.95When your KX450F engine takes a hit, a quality rebuild kit is the difference between getting back on track quickly and facing weeks of downtime sourcing individual components. The Wrench Rabbit Complete Engine Rebuild Kit eliminates guesswork by pairing...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
$788.95When your Kawasaki KX85 two-stroke demands a full rebuild, you need OEM-quality components that won't compromise performance or reliability. The Wrench Rabbit WR101-170 delivers every critical internal component in a single kit, eliminating the guesswork...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
$1,249.95When your RM-Z250's engine shows signs of wear—whether it's loss of compression, bearing play, or general fatigue—a complete rebuild using OEM-quality components is the most cost-effective path to reliability. The Wrench Rabbit WR101-169 kit eliminates...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
$1,183.95When your Yamaha YZ250F's engine has accumulated hours on the track or trail, a complete rebuild with quality components is the most cost-effective way to restore reliability and performance. The Wrench Rabbit kit eliminates the guesswork of sourcing...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
$1,183.95Qty in Cart: 0Quantity:Price:$1,183.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX250 1992 WR101-111
WRENCH RABBIT
$867.95When your KX250's engine shows signs of wear, a full rebuild restores performance and reliability without the guesswork of sourcing individual components. The Wrench Rabbit Engine Rebuild Kit for Kawasaki KX250 1992 consolidates all critical internal...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
$895.95A two-stroke engine rebuild demands precision components that work together seamlessly—this kit eliminates the guesswork by bundling OEM-quality parts engineered specifically for your KX250. Whether you're refreshing a worn powerplant or rebuilding after...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
$895.95Qty in Cart: 0Quantity:Price:$895.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-827-10
WSM
$241.36A top-end rebuild demands precision components that restore—or exceed—OEM performance standards. The WSM Original Series kit supplies everything needed for a complete piston-to-gasket restoration, eliminating the guesswork of sourcing individual...09030123- 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
$688.95A top-end rebuild won't cut it if your CR250R's bottom end is wearing out. The Wiseco PWR101-100 gives you everything needed for a complete engine overhaul—pistons, crankshaft, bearings, and seals—so you're not replacing parts twice. This kit delivers...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
$688.95Qty in Cart: 0Quantity:Price:$688.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 1992-1997 PWR116A-101
WISECO
$549.95Whether you're rebuilding a worn CR125R or preparing for serious competition, a quality engine rebuild kit is non-negotiable. The Wiseco PWR116A-101 delivers OEM-grade components and premium upgrades in one complete package, eliminating the guesswork and...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
$554.95A top-end rebuild can only take your CR125 so far—a complete engine refresh with quality components is what separates reliable race machines from unreliable ones. The Wiseco PWR116A-104 kit provides everything needed for a full top and bottom-end...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
$554.95Qty in Cart: 0Quantity:Price:$554.95Subtotal: -
Wiseco Engine Kit for Kawasaki KX65 2000-2005 PWR117-100
WISECO
$499.95A complete engine rebuild demands precision components that won't compromise reliability or performance. The Wiseco Engine Kit for KX65 delivers a full top and bottom-end overhaul with rigorously tested internals, eliminating the guesswork of sourcing...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
$499.95Qty in Cart: 0Quantity:Price:$499.95Subtotal: -
Wiseco Engine Rebuild Kit Kawasaki KX100 1998-2005 PWR119-102
WISECO
$532.95When your KX100's engine reaches the end of its service life, a complete rebuild using OEM-quality components is the most cost-effective path to restored reliability and performance. The Wiseco Engine Rebuild Kit includes everything needed for a full top...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
$532.95 -
Wiseco Engine Rebuild Kit Kawasaki KX85 2001-2005 PWR119-104
WISECO
$499.95When your KX85's engine shows signs of wear—loss of compression, excessive blow-by, or simply tired performance—a full rebuild using OEM-quality components is the most cost-effective path back to reliable power. The Wiseco PWR119-104 kit eliminates 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
$499.95Qty in Cart: 0Quantity:Price:$499.95Subtotal: -
Wiseco Engine Rebuild Kit for 2001-2003 Suzuki RM125 PWR121-100
WISECO
$588.95A worn RM125 engine loses compression, power, and reliability—and a full rebuild is the only way to restore it to factory spec. The Wiseco PWR121-100 kit eliminates the guesswork by bundling all critical internal components in one package, so you're not...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
$588.95 -
Wiseco Engine Rebuild Kit Yamaha YZ85 2002-2018 PWR123-100
WISECO
$499.95When your YZ85's engine has logged serious hours on the track or trail, a complete rebuild with OEM-quality components is the only way to restore full power and reliability. The Wiseco Engine Rebuild Kit delivers everything you need for a comprehensive...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
$499.95 -
Wiseco Engine Rebuild Kit for 2001 Yamaha YZ125 PWR125-100
WISECO
$588.95When your YZ125's engine has logged serious hours, a complete rebuild is the only way to restore reliability and reclaim the performance you expect from your bike. This Wiseco kit delivers everything needed for a comprehensive top and bottom-end...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
$588.95 -
Wiseco Engine Rebuild Kit Yamaha YZ125 2003-2004 PWR125-102
WISECO
$588.95A complete engine rebuild isn't just maintenance—it's the foundation of consistent power delivery and reliability when you need it most. The Wiseco PWR125-102 kit gives you everything required for a comprehensive top and bottom-end overhaul on your...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
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ250 1999-2000 PWR126-100
WISECO
$710.95A YZ250 engine rebuild demands precision components that can withstand the demands of competitive riding. This Wiseco kit eliminates guesswork by bundling OEM-spec crankshaft and rod assemblies with all necessary gaskets, seals, and bearings into one...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
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal:
