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
-
KIBBLEWHITE Piston System 30-32700
KIBBLEWHITE
$660.02If you're serious about maximizing compression without sacrificing reliability, the KIBBLEWHITE Piston System 30-32700 is engineered to deliver. The convex valve reliefs are precisely matched to valve geometry, eliminating dangerous piston-to-valve...09031584- SKU:
- 09031584
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32900
KIBBLEWHITE
$660.02If you're serious about maximizing compression without sacrificing reliability, the KIBBLEWHITE Piston System 30-32900 is the engineered solution purpose-built for high-performance applications. The convex valve reliefs are precision-matched to your...09031585- SKU:
- 09031585
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 30-32600
KIBBLEWHITE
$660.02If you're chasing maximum compression without sacrificing reliability, the KIBBLEWHITE Piston System 30-32600 is engineered to deliver. The convex valve reliefs are precisely matched to Black Diamond™ stainless steel valves, eliminating the guesswork of...09031587- SKU:
- 09031587
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
$660.02 -
KIBBLEWHITE Piston System 80-81900
KIBBLEWHITE
$736.36Maximizing compression on a high-performance engine demands precision engineering—not guesswork. The KIBBLEWHITE Piston System 80-81900 is purpose-built to safely unlock compression gains through purposely convex valve reliefs that match your valve...09031588- SKU:
- 09031588
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 95.00 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$736.36 -
KIBBLEWHITE Piston System 80-82000
KIBBLEWHITE
$736.36If you're serious about maximizing compression without sacrificing reliability, the KIBBLEWHITE Piston System 80-82000 is the only engineered solution that gets it right. The convex valve reliefs are geometrically matched to your valve dishes,...09031589- SKU:
- 09031589
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 95.00 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$736.36 -
Wiseco Engine Rebuild Kit 2002-2023 Suzuki RM85 PWR166-100
WISECO
$499.95When your Suzuki RM85's engine reaches the end of its service life, a quality rebuild kit isn't optional—it's the foundation of reliable performance. The Wiseco PWR166-100 delivers OEM-equivalent components and premium upgrades in one complete package,...09031618- SKU:
- 09031618
- Availability:
- Ships Same Business Day
- Weight:
- 8.20 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$499.95Qty in Cart: 0Quantity:Price:$499.95Subtotal: -
Wiseco Engine Rebuild Kit 52.00mm Bore for 2006-2011 KTM 105 SX PWR176-100
WISECO
$588.95When your KTM 105 SX's engine shows signs of wear, a complete rebuild using OEM-quality components is the only way to restore full performance and reliability. The Wiseco PWR176-100 kit delivers all the precision-engineered parts you need—piston,...09031622- SKU:
- 09031622
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR125R 2005-2007 54mm Bore PWR177-100
WISECO
$588.95When your Honda CR125R 2005-2007 shows signs of wear—loss of compression, decreased power delivery, or visible piston scoring—a complete engine rebuild is the most cost-effective path to restoring full performance. The Wiseco PWR177-100 kit delivers...09031623- SKU:
- 09031623
- Availability:
- Ships Same Business Day
- Weight:
- 9.95 LBS
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$588.95 -
Wiseco Engine Rebuild Kit for 2013-2017 KTM 85 SX 17/14 PWR178-100
WISECO
$721.95When your KTM 85 SX's engine shows signs of wear—loss of compression, increased blow-by, or declining throttle response—a quality rebuild kit is the most cost-effective path to restoring OEM performance and reliability. The Wiseco PWR178-100 delivers all...09031624- SKU:
- 09031624
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$721.95Qty in Cart: 0Quantity:Price:$721.95Subtotal: -
Wiseco Engine Rebuild Kit for Honda CR250R 2002-2004 PWR132-100
WISECO
$710.95A two-stroke engine rebuild is a critical maintenance milestone that directly impacts power delivery, reliability, and race-day performance. The Wiseco PWR132-100 kit eliminates the guesswork by providing OEM-spec components engineered to tight...09031517- SKU:
- 09031517
- Availability:
- Ships Same Business Day
- Weight:
- 12.85 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
$710.95 -
Wiseco Engine Rebuild Kit for Yamaha YZ125 2005-2020 PWR163-100
WISECO
$588.95A complete engine rebuild kit eliminates the guesswork of sourcing individual components—you get everything needed for a full top and bottom-end overhaul in one package. Whether you're restoring a worn-out motor or preparing for the season ahead,...09031541- SKU:
- 09031541
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Engine Kit Kawasaki KX100 2006 PWR164-100
WISECO
$555.95A top and bottom-end rebuild is the most cost-effective way to restore your KX100 to factory performance specifications. The Wiseco Engine Kit eliminates the guesswork of sourcing individual components by bundling everything you need for a complete...09031542- SKU:
- 09031542
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 52.50 MM
- DISPLACEMENT:
- 100 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$555.95 -
Wiseco Engine Rebuild Kit for 2010-2013 Honda CRF250R PWR168-100
WISECO
$877.95When your CRF250's engine reaches the end of its service life, a complete rebuild restores original performance and reliability without the cost of a full replacement. The Wiseco Engine Rebuild Kit supplies every critical component needed for a thorough...09031546- SKU:
- 09031546
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$877.95 -
Wiseco Engine Rebuild Kit for 2005-2007 Honda CR250R PWR172-100
WISECO
$721.95A worn or damaged engine demands a complete rebuild, not a patch job. The Wiseco Engine Rebuild Kit for 2005-2007 Honda CRF250R delivers every critical component you need in one package—crankshaft, rod assembly, bearings, seals, and gaskets—all...09031548- SKU:
- 09031548
- Availability:
- Ships Same Business Day
- Weight:
- 13.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- GP SERIES PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$721.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 50 SX 2009-2012 WR101-158
WRENCH RABBIT
$683.95A two-stroke engine rebuild demands precision components that won't compromise performance or reliability. The Wrench Rabbit Engine Rebuild Kit for KTM 50 SX delivers everything you need in one package—eliminating guesswork and ensuring your engine runs...09031259- SKU:
- 09031259
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$683.95 -
Wrench Rabbit Engine Kit Suzuki RMZ250 2004 WR101-070
WRENCH RABBIT
$1,092.95When your Suzuki RMZ250 two-stroke engine shows wear, a complete rebuild with OEM-quality components is the most reliable path to restoring peak performance. The Wrench Rabbit Engine Kit delivers every critical component you need in one package,...09031006- SKU:
- 09031006
- Availability:
- Ships Same Business Day
- Weight:
- 12.15 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,092.95 -
Wrench Rabbit Engine Kit Suzuki RM-Z250 2007-2009 WR101-073
WRENCH RABBIT
$1,211.95A complete engine rebuild requires precision components and quality materials—this kit eliminates guesswork by bundling everything you need in one package. Whether you're refreshing a tired RM-Z250 or building a reliable platform for consistent track...09031008- SKU:
- 09031008
- Availability:
- Ships Same Business Day
- Weight:
- 13.50 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$1,211.95Qty in Cart: 0Quantity:Price:$1,211.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Suzuki RMZ250 2010-2012 WR101-074
WRENCH RABBIT
$1,211.95When your Suzuki RMZ250 shows signs of wear—loss of compression, increased blow-by, or sluggish throttle response—a complete engine rebuild is your path back to reliable performance. This Wrench Rabbit kit eliminates the guesswork by bundling every...09031009- SKU:
- 09031009
- Availability:
- Ships Same Business Day
- Weight:
- 12.45 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,211.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 1994-1996 Kawasaki KX250 WR101-117
WRENCH RABBIT
$867.95A complete engine rebuild demands precision components and a single, reliable source—this kit eliminates guesswork by bundling everything you need to restore your KX250 to factory specifications. Whether you're addressing worn pistons, damaged bearings,...09031091- SKU:
- 09031091
- Availability:
- Ships Same Business Day
- Weight:
- 14.25 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$867.95 -
Wrench Rabbit Engine Rebuild Kit KTM 144 SX 2007-2008 WR101-119
WRENCH RABBIT
$985.95Two-stroke engines demand precision when rebuilding—subpar components lead to premature failure and lost track time. The Wrench Rabbit Engine Rebuild Kit delivers everything you need in one package, eliminating guesswork and sourcing multiple suppliers...09031093- SKU:
- 09031093
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$985.95
