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
-
Wiseco Engine Rebuild Kit Yamaha YZ250 2001 PWR127-100
WISECO
$710.95When your YZ250's engine shows signs of wear—loss of compression, increased blow-by, or inconsistent power delivery—a complete rebuild restores the bike to factory performance standards. The Wiseco PWR127-100 kit eliminates the guesswork by bundling all...09031509- SKU:
- 09031509
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$710.95Qty in Cart: 0Quantity:Price:$710.95Subtotal: -
Wiseco Engine Rebuild Kit Honda CRF450R 2002-2006 PWR138-100
WISECO
$977.95When your CRF450R's engine shows signs of wear—whether from track abuse, high-mileage riding, or competitive use—a full rebuild is the most cost-effective path to restoring performance and reliability. The Wiseco Engine Rebuild Kit PWR138-100 delivers...09031524- SKU:
- 09031524
- Availability:
- Ships Same Business Day
- Weight:
- 15.40 LBS
$977.95 -
Wiseco Engine Rebuild Kit for 2007 Honda CRF450R PWR138-101
WISECO
$977.95When your CRF450R's engine reaches the end of its service life, a complete rebuild is your most cost-effective path back to reliable performance. The Wiseco Engine Rebuild Kit PWR138-101 eliminates the guesswork by bundling every critical top and...09031525- SKU:
- 09031525
- Availability:
- Ships Same Business Day
- Weight:
- 15.05 LBS
$977.95 -
Wiseco Engine Rebuild Kit Yamaha YZ450F 2003-2005 PWR139-100
WISECO
$969.95Your YZ450F's engine has finite service life—whether you've logged serious track hours or encountered catastrophic failure, a complete rebuild demands quality components engineered to exact OEM specifications. The Wiseco Engine Rebuild Kit delivers...09031526- SKU:
- 09031526
- Availability:
- Ships Same Business Day
- Weight:
- 13.80 LBS
$969.95Qty in Cart: 0Quantity:Price:$969.95Subtotal: -
Wiseco Engine Rebuild Kit for 2003-2004 Yamaha YZ250F PWR140-100
WISECO
$889.95A complete engine rebuild demands precision-engineered components that won't compromise your YZ250F's performance when it matters most. The Wiseco PWR140-100 kit delivers all the critical internal parts you need to restore your four-stroke to factory...09031527- SKU:
- 09031527
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$889.95Qty in Cart: 0Quantity:Price:$889.95Subtotal: -
Wiseco Engine Rebuild Kit for Yamaha YZ250F 2005-2007 PWR140-101
WISECO
$889.95Engine wear and fatigue are inevitable on the track and trail, but a complete rebuild doesn't have to mean sourcing parts from multiple suppliers. The Wiseco Engine Rebuild Kit for YZ250F delivers everything needed for a full top and bottom-end...09031528- SKU:
- 09031528
- Availability:
- Ships Same Business Day
- Weight:
- 11.35 LBS
$889.95Qty in Cart: 0Quantity:Price:$889.95Subtotal: -
Wiseco Engine Rebuild Kit Yamaha YZ250F 2008-2011 PWR140-102
WISECO
$988.95When your YZ250F's engine reaches the end of its service life, a quality rebuild kit is the difference between getting back on the track and dealing with catastrophic failure. The Wiseco Engine Rebuild Kit PWR140-102 provides everything needed for a...09031529- SKU:
- 09031529
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$988.95Qty in Cart: 0Quantity:Price:$988.95Subtotal: -
Wiseco Engine Rebuild Kit for 2006 Kawasaki KX250F PWR144-101
WISECO
$932.95A top-end and bottom-end rebuild kit gives you a complete, factory-engineered solution when your KX250F demands more than patchwork repairs. The Wiseco PWR144-101 delivers OEM-quality components—crankshaft, rod, bearings, and seals—all tuned for the...09031532- SKU:
- 09031532
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$932.95 -
Wiseco Engine Rebuild Kit for Kawasaki KX250F 2007-2008 PWR144-102
WISECO
$932.95When your KX250F's engine reaches the end of its service life, a complete rebuild restores it to factory specifications without the cost of replacement. The Wiseco PWR144-102 kit supplies all critical components—pistons, rings, bearings, seals, and...09031533- SKU:
- 09031533
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$932.95 -
Wiseco Engine Rebuild Kit Honda CRF250R 2008-2009 PWR159-100
WISECO
$888.95A complete engine rebuild requires precision components that can withstand the demands of competitive riding and trail use. This Wiseco kit delivers all the critical internal components you need in one package, eliminating the guesswork of sourcing...09031537- SKU:
- 09031537
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$888.95Qty in Cart: 0Quantity:Price:$888.95Subtotal: -
Wiseco Engine Rebuild Kit for KTM 125 SX 2016-2017 PWR213-100
WISECO
$884.95When your KTM 125 SX engine shows signs of wear—whether from track abuse or high-mileage riding—a complete rebuild with quality components is the only way to restore original performance and reliability. The Wiseco PWR213-100 kit eliminates guesswork by...09031672- SKU:
- 09031672
- Availability:
- Ships Same Business Day
- Weight:
- 8.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$884.95Qty in Cart: 0Quantity:Price:$884.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2006-2008 KTM 50 SX WR00003
WRENCH RABBIT
$592.95Engine wear is inevitable on a high-use pit bike like the 2006-2008 KTM 50 SX, but premature failure doesn't have to be. The Wrench Rabbit Complete Engine Rebuild Kit WR00003 supplies every critical component you need to restore your engine to like-new...09031630- SKU:
- 09031630
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95 -
WRENCH RABBIT Engine Kit - Kawasaki WR00004
WRENCH RABBIT
$1,013.95When your engine reaches the end of its service life, a complete rebuild kit eliminates the guesswork and ensures you're installing quality OEM-equivalent components throughout the entire engine. The WRENCH RABBIT Engine Kit delivers everything you need...09031631- SKU:
- 09031631
- Availability:
- Ships Same Business Day
- Weight:
- 15.65 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX60 1985-2003 WR00005
WRENCH RABBIT
$564.95A worn or damaged engine can rob your KX60 of reliability and performance—and a partial rebuild often leads to premature failure of related components. The Wrench Rabbit Complete Engine Rebuild Kit eliminates guesswork by pairing every critical internal...09031632- SKU:
- 09031632
- Availability:
- Ships Same Business Day
- Weight:
- 7.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$564.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Yamaha YZ250F 2016-2018 WR00008
WRENCH RABBIT
$1,132.95When your YZ250F's engine shows signs of wear—whether from high-mileage racing, a catastrophic failure, or routine maintenance—a complete rebuild is your path back to factory-spec reliability and performance. The Wrench Rabbit WR00008 kit eliminates the...09031634- SKU:
- 09031634
- Availability:
- Ships Same Business Day
- Weight:
- 12.30 LBS
- RIDING STYLE:
- UTV
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,132.95 -
Wrench Rabbit Engine Rebuild Kit for 2014-2015 KTM 250 SX-F WR101-161
WRENCH RABBIT
$1,315.95When your KTM 250 SX-F engine shows signs of wear—whether from hard racing, trail riding, or age—a complete rebuild restores it to like-new performance and reliability. The Wrench Rabbit WR101-161 kit eliminates the guesswork by bundling every critical...09031262- SKU:
- 09031262
- Availability:
- Ships Same Business Day
- Weight:
- 12.75 LBS
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,315.95 -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX100 2014-2016 WR101-163
WRENCH RABBIT
$711.95When your Kawasaki KX100 needs a full rebuild, settling for incomplete kits wastes time and invites reliability issues. The Wrench Rabbit Engine Rebuild Kit delivers everything you need to restore your engine to factory specifications in one...09031264- SKU:
- 09031264
- Availability:
- Ships Same Business Day
- Weight:
- 8.10 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$711.95Qty in Cart: 0Quantity:Price:$711.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for KTM 200 EXC 2000-2002 WR101-180
WRENCH RABBIT
$1,013.95When your KTM 200 EXC engine has reached the end of its service life, a complete rebuild is the most cost-effective way to restore full performance and reliability. The Wrench Rabbit WR101-180 delivers all the critical components you need in one...09031436- SKU:
- 09031436
- Availability:
- Ships Same Business Day
- Weight:
- 11.70 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,013.95 -
Wrench Rabbit Engine Rebuild Kit 2014-2016 Yamaha YZ450F WR101-181
WRENCH RABBIT
$1,249.95When your YZ450F needs more than a quick fix, a full engine rebuild restores it to factory specifications and renewed reliability. The Wrench Rabbit Engine Rebuild Kit WR101-181 consolidates every critical internal component into one complete package,...09031437- SKU:
- 09031437
- Availability:
- Ships Same Business Day
- Weight:
- 16.25 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,249.95 -
Wrench Rabbit Engine Rebuild Kit 2004-2007 Yamaha YFZ450 WR101-186
WRENCH RABBIT
$1,052.95When your YFZ450 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates the guesswork of sourcing individual components. The Wrench Rabbit WR101-186 bundles all the critical internals—pistons, cranks, bearings, and...09031438- SKU:
- 09031438
- Availability:
- Ships Same Business Day
- Weight:
- 10.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,052.95
