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
-
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-821-22
WSM
$357.62A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained high RPMs—this kit delivers exactly that. The WSM Original Series combines OEM-quality pistons with premium supporting hardware, eliminating the...01082122- SKU:
- 01082122
- Availability:
- Ships Same Business Day
- Weight:
- 4.85 LBS
- BORE SIZE METRIC:
- 80.50 MM
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- ORIGINAL SERIES
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$357.62 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-825-10
WSM
$250.31A top-end rebuild demands precision components that restore your engine to factory specifications—or exceed them. The WSM Top-End Rebuild Kit delivers OEM-quality pistons, rings, and gaskets in one complete package, eliminating the guesswork and multiple...01082510- SKU:
- 01082510
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 81.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
$250.31 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-826-12
WSM
$250.31A top-end rebuild demands precision components that restore your engine to factory specifications—or beyond. The WSM Original Series kit eliminates the guesswork by bundling every critical component you need for a complete piston and gasket overhaul in...01082612- SKU:
- 01082612
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- BORE SIZE METRIC:
- 84.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- TYPE:
- TOP END
- UNITS:
- EACH
$250.31 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-826-22
WSM
$393.39A top-end rebuild is essential maintenance for any high-performance engine—whether you're preparing for race season or restoring peak power after extended use. The WSM Original Series kit delivers OEM-quality components engineered to tight tolerances,...01082622- SKU:
- 01082622
- Availability:
- Ships Same Business Day
- Weight:
- 5.20 LBS
- BORE SIZE METRIC:
- 84.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$393.39 -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-829-10P
WSM
$447.05A top-end rebuild demands precision components that can handle sustained high-RPM loads without compromise. The WSM Platinum Series kit delivers OEM-quality pistons, rings, and bearings in a complete package, eliminating the guesswork of sourcing...01082910BP- SKU:
- 01082910BP
- Availability:
- Ships Same Business Day
- Weight:
- 5.55 LBS
- PISTON MATERIAL:
- ALUMINUM
- TYPE:
- TOP END
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 79.90 MM
- MODEL:
- PLATINUM SERIES
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$447.05 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-831-10
WSM
$352.08A complete top-end rebuild requires precision-matched components that work in harmony—mismatched or worn parts will compromise ring seal, increase blowby, and tank your power output. The WSM Top-End Rebuild Kit delivers OEM-quality pistons paired with...01083110- SKU:
- 01083110
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 65.00 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
$352.08 -
WSM Top-End Rebuild Kit - Original Series - .25 mm 010-832-11
WSM
$233.46A top-end rebuild demands precision components that withstand extreme combustion pressures and sustained RPM loads. The WSM Original Series kit delivers OEM-equivalent quality with race-proven materials, eliminating guesswork during your engine refresh...01083211- SKU:
- 01083211
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 81.25 MM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +0.25 MM
$233.46 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-832-12
WSM
$241.36A top-end rebuild demands precision components that restore your engine to factory specifications—or better. The WSM Original Series Kit delivers OEM-quality pistons, rings, and bearings in one complete package, eliminating the guesswork of sourcing...01083212- SKU:
- 01083212
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- BORE SIZE METRIC:
- 81.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PISTON SIZE METRIC:
- +0.50 MM
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$241.36 -
WSM Top-End Rebuild Kit - Original Series - .25 mm 010-832-21
WSM
$326.90A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained RPM loads. The WSM Original Series kit eliminates guesswork by bundling OEM-quality pistons, rings, and bearings into one complete solution,...01083221- SKU:
- 01083221
- Availability:
- Ships Same Business Day
- Weight:
- 4.30 LBS
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +0.25 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 81.25 MM
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$326.90 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-832-22
WSM
$326.90A complete top-end rebuild demands precision components that restore your engine to factory specifications or beyond. The WSM Original Series kit delivers OEM-quality pistons, rings, and gaskets in one package, eliminating the need to source individual...01083222- SKU:
- 01083222
- Availability:
- Ships Same Business Day
- Weight:
- 4.13 LBS
- PRODUCT NAME:
- REBUILD KIT
- 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
$326.90 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-825-14
WSM
$250.31A top-end rebuild is critical maintenance for high-performance engines operating at sustained RPMs and boost levels—this kit delivers OEM-quality components engineered to restore compression, reduce blow-by, and extend engine life. The WSM Original...01082514- SKU:
- 01082514
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
$250.31 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-826-10
WSM
$250.31A top-end rebuild demands precision components that restore your engine to factory specifications—or beyond. The WSM Top-End Rebuild Kit supplies everything needed for a complete piston and gasket renewal, eliminating the guesswork and sourcing multiple...01082610- SKU:
- 01082610
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 84.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$250.31Qty in Cart: 0Quantity:Price:$250.31Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-840-12
WSM
$339.74A complete top-end rebuild demands precision components that restore your engine to factory specifications or better. This WSM Original Series kit eliminates the guesswork by bundling every critical component needed for a professional-grade piston...01084012- SKU:
- 01084012
- Availability:
- Ships Same Business Day
- Weight:
- 4.05 LBS
- RIDING STYLE:
- WATERCRAFT
- PISTON SIZE METRIC:
- +0.50 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 73.50 MM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$339.74 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-840-14
WSM
$339.74A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained RPM cycles. The WSM Original Series kit delivers OEM-quality pistons paired with premium racing bearings and complete gasket sets, eliminating...01084014- SKU:
- 01084014
- Availability:
- Ships Same Business Day
- Weight:
- 4.40 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 74.00 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$339.74 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-812-14
WSM
$205.60A top-end rebuild is essential when your engine shows signs of wear—loss of compression, increased blowby, or diminished throttle response. The WSM Original Series Top-End Rebuild Kit delivers OEM-quality components that restore your engine to factory...01081214- SKU:
- 01081214
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 76.00 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
$205.60 -
Wrench Rabbit Engine Rebuild Kit Suzuki RM85 2002-2004 WR101-068
WRENCH RABBIT
$618.95When a two-stroke engine reaches the end of its service life, a quality rebuild kit is the most cost-effective way to restore full performance and reliability. The Wrench Rabbit Engine Rebuild Kit for Suzuki RM85 (2002-2004) gives you OEM-grade...09031004- SKU:
- 09031004
- Availability:
- Ships Same Business Day
- Weight:
- 8.75 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$618.95 -
Wrench Rabbit Suzuki RM85 2005-2020 Engine Rebuild Kit WR101-069
WRENCH RABBIT
$618.95Two-stroke engines demand precision rebuilds to maintain peak performance and reliability. The Wrench Rabbit Suzuki RM85 Engine Rebuild Kit delivers all the critical components you need in one complete package, eliminating guesswork and compatibility...09031005- SKU:
- 09031005
- Availability:
- Ships Same Business Day
- Weight:
- 8.70 LBS
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$618.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2005 Suzuki RM250 WR101-064
WRENCH RABBIT
$920.95A two-stroke rebuild demands precision—worn pistons, bearings, and seals compromise power delivery and engine longevity. The Wrench Rabbit Complete Engine Rebuild Kit for your 2005 Suzuki RM250 consolidates virtually every internal component you'll need...09031002- SKU:
- 09031002
- Availability:
- Ships Same Business Day
- Weight:
- 14.40 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$920.95 -
Wrench Rabbit Engine Rebuild Kit for Suzuki RM250 2006-2008 WR101-065
WRENCH RABBIT
$920.95A complete engine rebuild requires precision-engineered components working in harmony—and sourcing them individually wastes time and introduces compatibility risks. The Wrench Rabbit Engine Rebuild Kit for your RM250 consolidates everything into one...09031003- SKU:
- 09031003
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$920.95 -
Wrench Rabbit Complete Engine Rebuild Kit for KTM 50 SX 2013-2016 WR101-159
WRENCH RABBIT
$683.95When your KTM 50 SX's engine shows signs of wear—loss of compression, bearing play, or just plain tired performance—a complete rebuild is the most cost-effective path back to reliability. The Wrench Rabbit WR101-159 kit eliminates the guesswork by...09031260- SKU:
- 09031260
- Availability:
- Ships Same Business Day
- Weight:
- 5.80 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$683.95
