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 Engine Rebuild Kit Kawasaki KX65 2006-2012 WR101-051
WRENCH RABBIT
$592.95Two-stroke engines demand precision during rebuild, and cutting corners on component quality will cost you performance and reliability. The Wrench Rabbit Engine Rebuild Kit delivers every critical component you need in one package—piston, crank,...09030989- SKU:
- 09030989
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- WRENCH RABBIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2003-2004 Suzuki RM250 WR101-063
WRENCH RABBIT
$946.95A two-stroke engine rebuild demands precision and reliability—this Wrench Rabbit kit delivers both with OEM-quality components engineered specifically for your RM250. Rather than sourcing pistons, cranks, and bearings separately, you get a complete,...09031001- SKU:
- 09031001
- Availability:
- Ships Same Business Day
- Weight:
- 14.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$946.95 -
Wrench Rabbit Engine Rebuild Kit 2002-2004 Honda CR250R WR101-015
WRENCH RABBIT
$828.95A two-stroke engine rebuild demands precision components that work together as a system—not mismatched parts that compromise reliability. This Wrench Rabbit kit eliminates guesswork by pairing OEM-quality pistons, crankshafts, and bearing assemblies from...09030955- SKU:
- 09030955
- Availability:
- Ships Same Business Day
- Weight:
- 14.10 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$828.95 -
Vertex Engine Rebuild Kit for 2016-2017 Honda CRF250R WR101-219
WRENCH RABBIT
$1,092.95When your Honda CRF250R's engine shows signs of wear—lost compression, increased blowby, or declining power delivery—a complete engine rebuild is the most cost-effective path to restored performance. The Vertex Engine Rebuild Kit for 2016-2017 models...09030959- SKU:
- 09030959
- Availability:
- Ships Same Business Day
- Weight:
- 12.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-819-14
WSM
$330.79A complete top-end rebuild demands precision components that won't compromise engine integrity or performance. The WSM Original Series kit delivers OEM-quality pistons, rings, and bearings in one package, eliminating the guesswork of sourcing individual...09030122- SKU:
- 09030122
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.91 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
$330.79 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-827-14
WSM
$241.36A top-end rebuild demands precision components that won't compromise your engine's reliability or performance. The WSM Original Series kit delivers OEM-quality pistons, rings, and bearings engineered to tight tolerances, ensuring consistent compression,...09030125- SKU:
- 09030125
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
$241.36 -
On Sale
Wiseco Engine Rebuild Kit for 2002-2003 Kawasaki KX250 PWR128-100
WISECO
MSRP: $659.95Now: $561.00Was: $659.95When your KX250's engine has logged serious hours, a complete rebuild is the only path to restoring full power and reliability. The Wiseco PWR128-100 Engine Rebuild Kit gives you every critical component needed to return your engine to factory...09031607- SKU:
- 09031607
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
MSRP: $659.95Now: $561.00Was: $659.95Qty in Cart: 0Quantity:Price:MSRP: $659.95Now: $561.00Was: $659.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for 2006 KTM 250 SX 66.40mm PWR179-100
WISECO
MSRP: $791.52Now: $706.00Was: $791.52When your 2-stroke 250cc engine shows signs of wear—loss of compression, sluggish throttle response, or visible carbon buildup—a complete rebuild is the most cost-effective path to restoring full performance. The Wiseco PWR179-100 kit eliminates the...09031660- SKU:
- 09031660
- Availability:
- Ships Same Business Day
- Weight:
- 13.10 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
MSRP: $791.52Now: $706.00Was: $791.52 -
On Sale
Wiseco Engine Rebuild Kit for KTM 300 XC 2008-2015 PWR238-101
WISECO
MSRP: $967.55Now: $822.00Was: $967.55A two-stroke engine rebuild demands precision components that can handle the demands of high-RPM operation, and the Wiseco PWR238-101 delivers exactly that. This comprehensive kit eliminates the guesswork by bundling every critical component you need for...09031666- SKU:
- 09031666
- Availability:
- Ships Same Business Day
- Weight:
- 14.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $967.55Now: $822.00Was: $967.55 -
On Sale
Wrench Rabbit Complete Engine Rebuild Kit for KTM 200 EXC 1998-1999 WR00032
WRENCH RABBIT
MSRP: $1,052.95Now: $674.00Was: $1,052.95When your KTM 200 EXC's engine shows signs of wear—whether it's loss of compression, bearing play, or cooling issues—a complete rebuild is the most cost-effective path to restoring full performance and reliability. The Wrench Rabbit WR00032 kit...09031639- SKU:
- 09031639
- Availability:
- Ships Same Business Day
- Weight:
- 11.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- UNITS:
- KIT
MSRP: $1,052.95Now: $674.00Was: $1,052.95Qty in Cart: 0Quantity:Price:MSRP: $1,052.95Now: $674.00Was: $1,052.95Subtotal: -
Vertex Complete Engine Rebuild Kit for Yamaha YZ250 2003-2025 WR101-082
WRENCH RABBIT
$867.95When your YZ250 two-stroke takes a beating on the track or trail, a complete engine rebuild demands precision components across every critical system. The Vertex Complete Engine Rebuild Kit eliminates the guesswork of sourcing individual parts by...09031017- SKU:
- 09031017
- Availability:
- Ships Same Business Day
- Weight:
- 13.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$867.95 -
Wrench Rabbit Yamaha YZ250F 2003-2004 Complete Engine Rebuild Kit WR101-083
WRENCH RABBIT
$1,157.95When your YZ250F's engine has logged serious hours, a complete rebuild is the only way to restore original performance and reliability. The Wrench Rabbit complete engine rebuild kit eliminates the guesswork of sourcing individual components—everything...09031018- SKU:
- 09031018
- Availability:
- Ships Same Business Day
- Weight:
- 13.05 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2005-2007 Yamaha YZ250F WR101-084
WRENCH RABBIT
$1,157.95When your Yamaha YZ250F's engine reaches the end of its service life, a complete rebuild restores it to factory specifications and performance reliability. The Wrench Rabbit WR101-084 kit consolidates every critical component you'll need—pistons,...09031019- SKU:
- 09031019
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ250F 2008-2013 WR101-085
WRENCH RABBIT
$1,157.95When your Yamaha YZ250F's engine reaches the end of its service life, a complete rebuild is the most cost-effective way to restore full performance and reliability. This Wrench Rabbit kit eliminates the guesswork by bundling OEM-equivalent components...09031020- SKU:
- 09031020
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit Yamaha YZ450F 2003-2005 WR101-086
WRENCH RABBIT
$1,183.95When your Yamaha YZ450F's engine shows signs of wear—whether from race-day abuse or high-mileage riding—a complete rebuild restores factory performance and reliability without the guesswork. The Wrench Rabbit kit consolidates every critical component you...09031021- SKU:
- 09031021
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,183.95 -
Wrench Rabbit Engine Kit Yamaha YZ125 1998-2000 WR101-093
WRENCH RABBIT
$1,211.95A seized or worn two-stroke engine doesn't just cost you track time—it threatens the reliability of your entire bike. The Wrench Rabbit Engine Kit gives you everything needed for a complete, professional-grade rebuild without the hassle of sourcing...09031022- SKU:
- 09031022
- Availability:
- Ships Same Business Day
- Weight:
- 15.75 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,211.95 -
Wrench Rabbit Engine Rebuild Kit for Yamaha YZ450F 2010-2013 WR101-088
WRENCH RABBIT
$1,249.95Whether you're recovering from a blown top-end or performing preventative maintenance, the Wrench Rabbit Engine Rebuild Kit gives you everything needed for a complete, professional-grade rebuild of your YZ450F. This kit eliminates the guesswork of...09031023- SKU:
- 09031023
- Availability:
- Ships Same Business Day
- Weight:
- 16.35 LBS
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,249.95 -
Wrench Rabbit Yamaha YZ85 2002-2016 Complete Engine Rebuild Kit WR101-089
WRENCH RABBIT
$564.95When a two-stroke engine reaches the end of its service life, a complete rebuild is your most cost-effective path back to peak performance. The Wrench Rabbit YZ85 kit consolidates everything you need—pistons, bearings, gaskets, and seals—into a single,...09031024- SKU:
- 09031024
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$564.95 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-817-12
WSM
$223.48A top-end rebuild demands precision components that can withstand extreme combustion pressures and maintain clearances across repeated heat cycles. The WSM Original Series kit eliminates guesswork by bundling all necessary internals—pistons, rings, pins,...09030035- SKU:
- 09030035
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 82.50 MM
- PISTON SIZE METRIC:
- +0.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-817-10
WSM
$223.48A top-end rebuild demands precision components that restore your engine's compression, ring seal, and combustion efficiency to factory specifications—or better. The WSM Original Series kit delivers OEM-quality pistons paired with premium gaskets and...09030034- SKU:
- 09030034
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48
