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, ensuring your engine performs at peak output without...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 peak power output—keeping your engine competitive...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 specifications without the cost of a full engine replacement...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 gasket materials and racing-spec needle...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 components in a complete package, eliminating the guesswork...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 valve geometry precisely, eliminating the guesswork and...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 meticulously inspected crankshaft and rod assembly with OEM-grade...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 PWR161A-100 kit eliminates the guesswork by bundling...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 reliability. The Wiseco Engine Rebuild Kit PWR164-101 gives you...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 PWR168-101 bundles all critical top and bottom-end components...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 top-and-bottom-end solution with OEM-equivalent quality, so you're...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
$588.95 -
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 Rebuild Kit delivers everything needed for a complete...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 delivers all critical internals in one shot—piston, crank,...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 delivers all the critical wear items—pistons,...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 you need in one package, eliminating guesswork and...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 guesswork of sourcing individual parts and ensuring...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 kit eliminates guesswork by bundling all critical...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 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:
