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 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...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
$828.40When 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...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
$828.40 -
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...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...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...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...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,...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
$241.36Qty in Cart: 0Quantity:Price:$241.36Subtotal: -
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...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...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...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...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...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...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...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
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
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...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...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
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
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...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...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: -
Wiseco Engine Rebuild Kit Yamaha YZ250 2001 PWR127-100
WISECO
$710.95When your YZ250's engine shows signs of wear—loss of compression, increased blow-by, or inconsistent power delivery—a complete rebuild restores the bike to factory performance standards. The Wiseco...09031509- SKU:
- 09031509
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$710.95 -
Wiseco Engine Rebuild Kit Honda CRF450R 2002-2006 PWR138-100
WISECO
$977.95When your CRF450R's engine shows signs of wear—whether from track abuse, high-mileage riding, or competitive use—a full rebuild is the most cost-effective path to restoring performance and...09031524- SKU:
- 09031524
- Availability:
- Ships Same Business Day
- Weight:
- 15.40 LBS
$977.95Qty in Cart: 0Quantity:Price:$977.95Subtotal:
