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
-
On Sale
KIBBLEWHITE Piston System 30-32700
KIBBLEWHITE
MSRP: $706.21Now: $594.02Was: $706.21If 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...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
MSRP: $706.21Now: $594.02Was: $706.21 -
On Sale
KIBBLEWHITE Piston System 30-32900
KIBBLEWHITE
MSRP: $660.02Now: $594.02Was: $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...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
MSRP: $660.02Now: $594.02Was: $660.02 -
On Sale
KIBBLEWHITE Piston System 30-32600
KIBBLEWHITE
MSRP: $660.02Now: $594.02Was: $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...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
MSRP: $660.02Now: $594.02Was: $660.02 -
On Sale
KIBBLEWHITE Piston System 80-81900
KIBBLEWHITE
MSRP: $736.36Now: $662.72Was: $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...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
MSRP: $736.36Now: $662.72Was: $736.36 -
On Sale
KIBBLEWHITE Piston System 80-82000
KIBBLEWHITE
MSRP: $736.36Now: $662.72Was: $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...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
MSRP: $736.36Now: $662.72Was: $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...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
$499.95 -
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...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
$588.95 -
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...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
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
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...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
$721.95 -
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...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
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal: -
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...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...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...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,...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...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...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...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...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...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
$867.95Qty in Cart: 0Quantity:Price:$867.95Subtotal: -
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,...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
