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 010-826-12
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...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...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...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
$447.05Qty in Cart: 0Quantity:Price:$447.05Subtotal: -
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...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...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
$233.46Qty in Cart: 0Quantity:Price:$233.46Subtotal: -
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...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
$241.36Qty in Cart: 0Quantity:Price:$241.36Subtotal: -
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...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
$326.90Qty in Cart: 0Quantity:Price:$326.90Subtotal: -
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...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...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
$250.31Qty in Cart: 0Quantity:Price:$250.31Subtotal: -
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...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...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
$339.74Qty in Cart: 0Quantity:Price:$339.74Subtotal: -
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...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...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
$205.60Qty in Cart: 0Quantity:Price:$205.60Subtotal: -
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...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...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
$618.95Qty in Cart: 0Quantity:Price:$618.95Subtotal: -
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...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...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
$920.95Qty in Cart: 0Quantity:Price:$920.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for KTM 50 SX 2013-2016 WR101-159
WRENCH RABBIT
$718.15When 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...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
$718.15 -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-824-10P
WSM
$536.48A top-end rebuild is the foundation of reliable, high-output engine performance—and this kit delivers everything you need in one complete package. The WSM Platinum Series combines OEM-grade pistons...09030749- SKU:
- 09030749
- Availability:
- Ships Same Business Day
- Weight:
- 5.50 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM SERIES
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
$536.48Qty in Cart: 0Quantity:Price:$536.48Subtotal: -
On Sale
KIBBLEWHITE Piston Kit 30-33100
KIBBLEWHITE
MSRP: $660.02Now: $594.02Was: $660.02A complete top-end overhaul requires precision components engineered to work in harmony—this kit delivers exactly that. The KIBBLEWHITE 30-33100 pairs high-compression racing internals with premium...09031595- SKU:
- 09031595
- Availability:
- Ships Same Business Day
- Weight:
- 1.86 LBS
- PRODUCT NAME:
- SERVICE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 96.00 MM
MSRP: $660.02Now: $594.02Was: $660.02
