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 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...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...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...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...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...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...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...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...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...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...09031630- SKU:
- 09031630
- Availability:
- Ships Same Business Day
- Weight:
- 5.70 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95Qty in Cart: 0Quantity:Price:$592.95Subtotal: -
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...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
$1,013.95Qty in Cart: 0Quantity:Price:$1,013.95Subtotal: -
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...09031632- SKU:
- 09031632
- Availability:
- Ships Same Business Day
- Weight:
- 7.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$564.95Qty in Cart: 0Quantity:Price:$564.95Subtotal: -
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...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...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...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...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...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...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 -
Wrench Rabbit Engine Rebuild Kit for Suzuki RM125 2004-2007 WR101-187
WRENCH RABBIT
$1,013.95Two-stroke engines don't rebuild themselves—and using a piecemeal approach to sourcing gaskets, bearings, and pistons invites compatibility issues and wasted time. The Wrench Rabbit WR101-187...09031439- SKU:
- 09031439
- Availability:
- Ships Same Business Day
- Weight:
- 10.85 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$1,013.95Qty in Cart: 0Quantity:Price:$1,013.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 1995-1996 Honda CR250R WR101-013
WRENCH RABBIT
$828.95A two-stroke engine rebuild demands precision and quality components—this Wrench Rabbit kit delivers both with OEM-equivalent parts engineered specifically for 1995-1996 Honda CR250R motors. Rather...09030953- SKU:
- 09030953
- Availability:
- Ships Same Business Day
- Weight:
- 14.65 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$828.95
