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
-
Wiseco Engine Rebuild Kit for 1986-1991 Honda CR80R PWR115-100
WISECO
$479.95When your CR80R's engine is worn, a complete rebuild with OEM-equivalent components restores reliability and performance without the guesswork of sourcing individual parts. The Wiseco PWR115-100...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
$510.95Engine wear is inevitable on a 1992-2002 Honda CR80R, but a complete rebuild doesn't have to mean sourcing parts from multiple suppliers. The Wiseco PWR115-101 Engine Rebuild Kit bundles everything...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
$510.95Qty in Cart: 0Quantity:Price:$510.95Subtotal: -
Wiseco Engine Rebuild Kit for 1998-1999 Honda CR125R PWR116A-102
WISECO
$549.95When your CR125R's engine has accumulated hours of hard riding, a complete rebuild is the only way to restore compression, throttle response, and reliability. The Wiseco PWR116A-102 kit eliminates...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
$967.84When your RM-Z450's engine reaches its limits, a complete rebuild with OEM-quality components is the only way to restore full performance and reliability. The Wiseco PWR142-100 kit eliminates the...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
$532.95When your CR85R's engine is worn or damaged, a complete rebuild is the most cost-effective path back to peak performance. The Wiseco Engine Rebuild Kit eliminates the guesswork by bundling all...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
$532.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ80 1993-2001 PWR122-100
WISECO
$474.95A worn YZ80 engine loses power, reliability, and resale value—but a complete rebuild using OEM-quality components restores it to factory specifications or better. The Wiseco PWR122-100 kit...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
$588.95Whether you're rebuilding after a blown top end or performing preventive maintenance, the Wiseco Engine Rebuild Kit PWR124-100 gives you a complete, factory-engineered solution for your YZ125. This...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
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ125 2002 PWR125-101
WISECO
$534.95A complete engine rebuild is the most critical maintenance a YZ125 can receive, and this Wiseco kit eliminates guesswork by providing every component you need for a proper top and bottom-end overhaul...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
$649.95A worn YZ250 engine doesn't just cost you performance—it costs you reliability when you need it most. The Wiseco Engine Rebuild Kit delivers a complete top and bottom-end solution, letting you...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
$710.95A complete engine rebuild is the most effective way to restore your KX250's performance and reliability after high-mileage use or damage. This Wiseco Engine Kit eliminates the guesswork by bundling...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
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal: -
Wiseco Engine Rebuild Kit for Kawasaki KX60 1985-2003 PWR130-100
WISECO
$459.95A KX60 engine rebuild demands precision components that can withstand the rigors of competition and high-rpm operation. The Wiseco Engine Rebuild Kit supplies everything you need for a complete top...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
$564.95A complete engine rebuild kit eliminates the guesswork of sourcing individual components—you get everything needed for a proper top and bottom-end overhaul in one package. Wiseco's precision...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
$932.95A worn or damaged engine cuts your CRF250R's power and reliability in half. The Wiseco Engine Rebuild Kit delivers OEM-exceeding components in a single package, eliminating the guesswork of sourcing...09031531- SKU:
- 09031531
- Availability:
- Ships Same Business Day
- Weight:
- 5.05 LBS
$932.95Qty in Cart: 0Quantity:Price:$932.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ450F 2006-2009 PWR151-100
WISECO
$1,010.95A complete engine rebuild demands precision components that restore your YZ450F to factory performance specifications—and this Wiseco kit delivers exactly that. Rather than sourcing pistons, rings,...09031535- SKU:
- 09031535
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
$1,010.95Qty in Cart: 0Quantity:Price:$1,010.95Subtotal: -
Wiseco Engine Rebuild Kit KTM 125 SX 2007-2015 PWR153-102
WISECO
$664.95When your KTM 125 SX engine has logged serious hours, a full rebuild is the only way to restore original performance and reliability. The Wiseco Engine Rebuild Kit PWR153-102 eliminates the guesswork...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
$1,052.95Engine wear is inevitable—especially on a hard-ridden KTM 300 EXC. The Wrench Rabbit Complete Engine Rebuild Kit (WR00002) gives you everything needed to restore full compression, reliability, and...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
$1,092.95When your Honda CRF250R engine reaches the end of its service life, a complete rebuild is the most cost-effective path to restoring full performance and reliability. The Wrench Rabbit Complete Engine...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 -
Wrench Rabbit Complete Engine Rebuild Kit for 2010-2013 Honda CRF250R WR101-024
WRENCH RABBIT
$1,147.60When your Honda CRF250R's engine shows signs of wear—whether it's loss of compression, excessive blow-by, or simply high hours—a complete rebuild using OEM-quality components is the most...09030964- SKU:
- 09030964
- Availability:
- Ships Same Business Day
- Weight:
- 12.91 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
$1,147.60 -
Wrench Rabbit Engine Rebuild Kit for 2008 Kawasaki KX450F WR101-044
WRENCH RABBIT
$1,211.95When your KX450F's engine reaches the end of its service life, a quality rebuild is your most cost-effective path back to reliable performance. The Wrench Rabbit Engine Rebuild Kit eliminates...09030981- SKU:
- 09030981
- Availability:
- Ships Same Business Day
- Weight:
- 17.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
$1,211.95Qty in Cart: 0Quantity:Price:$1,211.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX65 2002-2004 WR101-049
WRENCH RABBIT
$1,211.95A two-stroke engine rebuild demands precision components and reliable engineering—this kit delivers both. The Wrench Rabbit Engine Rebuild Kit bundles every critical internal component you need to...09030983- SKU:
- 09030983
- Availability:
- Ships Same Business Day
- Weight:
- 16.30 LBS
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,211.95Qty in Cart: 0Quantity:Price:$1,211.95Subtotal:
