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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WSM Top-End Rebuild Kit - Original Series - Standard 010-820-10
WSM
$221.36A top-end rebuild is fundamental to restoring compression, sealing, and combustion efficiency in high-revving engines. This WSM kit delivers OEM-quality components engineered to tight tolerances,...01082010- SKU:
- 01082010
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 80.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
$221.36Qty in Cart: 0Quantity:Price:$221.36Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-825-12
WSM
$238.39When your top-end is worn, performance suffers and reliability becomes questionable. The WSM Top-End Rebuild Kit delivers OEM-quality components engineered to restore compression, seal integrity, and...01082512- SKU:
- 01082512
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 81.50 MM
- PISTON MATERIAL:
- ALUMINUM
$238.39Qty in Cart: 0Quantity:Price:$238.39Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-832-10
WSM
$229.87A worn top-end compromises horsepower, fuel efficiency, and engine reliability. The WSM Top-End Rebuild Kit gives you OEM-grade components engineered to restore or exceed original performance...01083210- SKU:
- 01083210
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 81.00 MM
$229.87Qty in Cart: 0Quantity:Price:$229.87Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-841-10P
WSM
$391.70A top-end rebuild demands precision components engineered to withstand extreme combustion pressures and sustained RPM loads. The WSM Platinum Series delivers OEM-quality pistons paired with premium...01084110P- SKU:
- 01084110P
- Availability:
- Ships Same Business Day
- Weight:
- 4.80 LBS
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 79.87 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$391.70Qty in Cart: 0Quantity:Price:$391.70Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-815-10
WSM
$178.77A top-end rebuild is essential for restoring compression, reducing blow-by, and reclaiming lost horsepower after high-mileage or hard racing use. The WSM Original Series kit delivers OEM-quality...01081510- SKU:
- 01081510
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 76.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$178.77Qty in Cart: 0Quantity:Price:$178.77Subtotal: -
KIBBLEWHITE Piston System 30-32500
KIBBLEWHITE
$660.02If you're chasing higher compression ratios without sacrificing reliability, the KIBBLEWHITE Piston System 30-32500 is engineered specifically for that purpose. The convex valve reliefs match your...09031586- SKU:
- 09031586
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- BORE SIZE METRIC:
- 94.00 MM
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- ATV
- UNITS:
- KIT
- TYPE:
- TOP END
$660.02Qty in Cart: 0Quantity:Price:$660.02Subtotal: -
Wiseco Engine Rebuild Kit for 1997-2001 Honda CR250R PWR101-101
WISECO
$710.95A complete engine rebuild demands precision components that restore your CR250 to factory performance specs—and the Wiseco PWR101-101 delivers exactly that. This comprehensive kit pairs a...09031491- SKU:
- 09031491
- Availability:
- Ships Same Business Day
- Weight:
- 13.80 LBS
- 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
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal: -
Wiseco Engine Rebuild Kit KTM 65 SX 2003-2008 PWR161A-100
WISECO
$479.95When your KTM 65 SX engine hits high hours or shows signs of wear, a complete rebuild with OEM-quality components is the most cost-effective path to restoring reliability and performance. The Wiseco...09031538- SKU:
- 09031538
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 65 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- OVERBORE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$479.95Qty in Cart: 0Quantity:Price:$479.95Subtotal: -
Wiseco Engine Rebuild Kit for Kawasaki KX85 2006-2013 PWR164-101
WISECO
$499.95When your KX85's engine is showing signs of wear—whether from competitive racing, hard trail riding, or simply accumulated hours—a full rebuild becomes essential to restore performance and...09031543- SKU:
- 09031543
- Availability:
- Ships Same Business Day
- Weight:
- 7.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 85 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
$499.95Qty in Cart: 0Quantity:Price:$499.95Subtotal: -
Wiseco Engine Rebuild Kit Honda CRF250R 2014-2015 PWR168-101
WISECO
$864.95When your CRF250R's engine reaches the end of its service life, a complete rebuild is the most cost-effective path to restoring full performance and reliability. The Wiseco Engine Rebuild Kit...09031547- SKU:
- 09031547
- Availability:
- Ships Same Business Day
- Weight:
- 11.75 LBS
$864.95Qty in Cart: 0Quantity:Price:$864.95Subtotal: -
Wiseco Engine Rebuild Kit Kawasaki KX85 2014-2020 48.5mm PWR173-101
WISECO
$588.95When your KX85 engine reaches the end of its service life, a quality rebuild kit is your path back to reliable performance on the track or trail. The Wiseco PWR173-101 delivers a complete...09031682- SKU:
- 09031682
- Availability:
- Ships Same Business Day
- Weight:
- 3.52 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for KTM 125 SX 2007-2015 WR101-216
WRENCH RABBIT
$1,013.95When your KTM 125 SX's engine reaches the end of its service life, a quality rebuild kit saves you time and ensures consistent performance across all critical components. The Wrench Rabbit Engine...09031102- SKU:
- 09031102
- Availability:
- Ships Same Business Day
- Weight:
- 11.55 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95Qty in Cart: 0Quantity:Price:$1,013.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ85 2002-2016 WR101-089
WRENCH RABBIT
$1,183.95When your Yamaha YZ85 two-stroke demands a full rebuild, settling for mismatched components invites premature wear and unpredictable performance. The Wrench Rabbit Complete Engine Rebuild Kit...09031116- SKU:
- 09031116
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$1,183.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2013 Suzuki RMZ450 WR101-149
WRENCH RABBIT
$1,156.95A complete engine rebuild kit removes the guesswork from top and bottom-end work on your 2013 Suzuki RMZ450. Rather than sourcing individual components from multiple suppliers, this Wrench Rabbit kit...09031118- SKU:
- 09031118
- Availability:
- Ships Same Business Day
- Weight:
- 15.00 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,156.95Qty in Cart: 0Quantity:Price:$1,156.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for 2013-2016 Honda CRF450R WR101-150
WRENCH RABBIT
$1,132.95When your Honda CRF450R engine hits its limits, a complete rebuild is the only way to restore full performance and reliability. The Wrench Rabbit Engine Rebuild Kit bundles every critical component...09031119- SKU:
- 09031119
- Availability:
- Ships Same Business Day
- Weight:
- 16.30 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,132.95 -
Wiseco Engine Rebuild Kit Suzuki RM250 2005-2010 PWR165B-100
WISECO
$664.95Your RM250's performance depends on a reliable bottom end. The Wiseco Engine Rebuild Kit PWR165B-100 delivers a complete top and bottom-end overhaul with factory-inspected components, eliminating the...09031545- SKU:
- 09031545
- Availability:
- Ships Same Business Day
- Weight:
- 13.95 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal: -
Wiseco Engine Rebuild Kit 2002-2006 KTM 125 SX PWR153-101
WISECO
$721.95When your KTM 125 SX's engine shows signs of wear, a complete rebuild using OEM-quality components is the most cost-effective path to restoring full performance and reliability. The Wiseco PWR153-101...09031616- SKU:
- 09031616
- Availability:
- Ships Same Business Day
- Weight:
- 10.55 LBS
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$721.95Qty in Cart: 0Quantity:Price:$721.95Subtotal: -
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...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
$543.95Qty in Cart: 0Quantity:Price:$543.95Subtotal: -
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...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...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:
