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
$543.95Complete engine rebuilds demand precision components that restore both reliability and power output. The Wiseco Engine Rebuild Kit for your 2004-2012 KTM 85 SX delivers OEM-quality parts in a single package, eliminating guesswork and sourcing delays...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
$543.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 150 SX 2014-2015 WR101-173
WRENCH RABBIT
$1,092.95When your KTM 150 SX two-stroke has logged serious track time, an engine rebuild isn't optional—it's essential for maintaining peak performance and reliability. The Wrench Rabbit Engine Rebuild Kit gives you everything needed for a professional-grade...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
$229.87A top-end rebuild demands precision components that restore your engine to factory specifications—or beyond. The WSM Original Series Top-End Rebuild Kit delivers complete piston assemblies and gasket sets engineered for reliable performance across a wide...09030124- 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
$479.95When 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 eliminates compatibility issues by bundling everything you...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 you need—pistons, bearings, seals, and gaskets—into one...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 the guesswork of sourcing individual components by...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 guesswork by bundling everything you need for a proper...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 critical top and bottom-end components into a single,...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
$532.95Qty in Cart: 0Quantity:Price:$532.95Subtotal: -
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 consolidates everything you need for top and bottom-end work,...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 kit eliminates the guesswork of sourcing individual...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. Whether your engine has high hours, a seized piston,...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 restore your machine to factory specifications without the...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 all critical top and bottom-end components in one...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 and bottom-end overhaul—crankshaft, rod assembly,...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 engineering ensures your RM125 meets or exceeds OEM specs, so...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 individual parts and getting you back on the track or...09031531- SKU:
- 09031531
- Availability:
- Ships Same Business Day
- Weight:
- 5.05 LBS
$932.95 -
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, bearings, and gaskets separately, you get a validated...09031535- SKU:
- 09031535
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
$1,010.95 -
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 by providing every critical component you need in one...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 power in one comprehensive package, eliminating the...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 Rebuild Kit eliminates the guesswork by bundling every...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
