Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. 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 010-812-10
WSM
$205.60A top-end rebuild is essential when your engine shows signs of wear—loss of compression, increased blow-by, or declining power output. The WSM Top-End Rebuild Kit delivers OEM-quality components engineered to restore your engine to factory specifications...01081210- SKU:
- 01081210
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 75.00 MM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
$205.60 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-816-10
WSM
$223.48A top-end rebuild is essential when your engine shows signs of wear—loss of compression, increased blow-by, or declining power output. The WSM Top-End Rebuild Kit delivers OEM-quality components engineered to restore your engine to factory specifications...01081610- SKU:
- 01081610
- Availability:
- Ships Same Business Day
- Weight:
- 2.88 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 78.00 MM
$223.48 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-816-12
WSM
$223.48A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained high RPM operation. The WSM Original Series Kit delivers factory-quality pistons paired with complete gasket and bearing assemblies, eliminating...01081612- SKU:
- 01081612
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 78.50 MM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
$223.48 -
WSM Piston Kit - Sea-Doo 720 - Standard 010-817K
WSM
$89.33A quality piston kit is the foundation of reliable engine performance, and the WSM 010-817K delivers OEM-equivalent construction with engineered improvements for reduced heat and friction. The MOS2 coating on the skirts actively draws heat away from the...010817- SKU:
- 010817
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$89.33 -
WSM Piston Kit - Sea-Doo 720 - +.25 mm 010-817-04K
WSM
$89.33A piston kit failure can sideline your Sea-Doo 720 when you need it most. WSM's +.25 mm oversize pistons deliver OEM-equivalent quality with engineering upgrades specifically designed to reduce friction, lower operating temperatures, and extend engine...01081704- SKU:
- 01081704
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 82.00 MM
- MODEL:
- ORIGINAL
$89.33 -
WSM Piston Kit - Sea-Doo 720 - +.5 mm 010-817-05K
WSM
$89.33When you're running a Sea-Doo 720 at the limit, stock pistons become the weak link. The WSM Piston Kit delivers OEM-quality construction with measurable upgrades—specifically the MOS2 coating on the skirts that actively dissipates heat while reducing...01081705- SKU:
- 01081705
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 82.00 MM
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Sea-Doo 800 - Standard 010-818K
WSM
$89.33Sea-Doo 800 engines demand precision-engineered internals to handle sustained high-RPM performance, and OEM pistons often fall short in durability under aggressive use. The WSM Piston Kit delivers OEM-equivalent quality with meaningful...010818- SKU:
- 010818
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$89.33 -
WSM Piston Kit - Sea-Doo 800 - +.5 mm 010-818-05K
WSM
$89.33Stock pistons can't handle the demands of high-performance Sea-Doo 800 engines—especially when you're pushing for more power and reliability. The WSM Piston Kit delivers OEM-quality construction with critical performance upgrades, including a MOS2...01081805- SKU:
- 01081805
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- BORE SIZE METRIC:
- 82.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Sea-Doo 800 - +1 mm 010-818-07K
WSM
$89.33When you're pushing a Sea-Doo 800 to its limits, factory pistons become a liability. The WSM Piston Kit delivers OEM-quality construction with engineered improvements—notably the MOS2 coating that actively dissipates heat and reduces friction for...01081807- SKU:
- 01081807
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
$89.33 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-818-10
WSM
$223.48A complete top-end rebuild demands precision components that maintain tight tolerances under extreme combustion pressures. The WSM Top-End Rebuild Kit delivers OEM-quality pistons, rings, and bearings in one package, eliminating the guesswork of sourcing...01081810- SKU:
- 01081810
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
$223.48 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-818-12
WSM
$223.48A top-end rebuild is critical maintenance for high-performance engines, and this WSM kit delivers OEM-quality components in one complete package. Rather than sourcing pistons, rings, and gaskets separately, you get a proven combination engineered to work...01081812- SKU:
- 01081812
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 82.50 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$223.48 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-818-14
WSM
$223.48A top-end rebuild is non-negotiable when you're chasing peak performance and reliability. The WSM Original Series kit delivers OEM-quality pistons, rings, and bearings in one complete package, eliminating the guesswork of sourcing individual components...01081814- SKU:
- 01081814
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 83.00 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$223.48Qty in Cart: 0Quantity:Price:$223.48Subtotal: -
WSM Piston Kit - Sea-Doo 951 - Standard 010-819K
WSM
$98.28When your Sea-Doo 951 is pushing peak RPMs, stock pistons become a reliability liability. The WSM Piston Kit delivers OEM-or-better construction with advanced thermal management that reduces operating temperatures and friction, translating directly to...010819- SKU:
- 010819
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 87.91 MM
- PRODUCT NAME:
- PISTON KIT
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
WSM Piston Kit - Sea-Doo 951 - +.25 mm 010-819-04K
WSM
$98.28If you're pushing your Sea-Doo 951 to the limit, factory pistons won't cut it—they'll give up first. This WSM Piston Kit delivers OEM-quality construction with engineering upgrades that reduce heat and friction, giving you more power, better reliability,...01081904- SKU:
- 01081904
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 87.91 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PRODUCT NAME:
- PISTON KIT
$98.28 -
WSM Piston Kit - Sea-Doo 951 - +.5 mm 010-819-05K
WSM
$98.28If you're rebuilding a Sea-Doo 951 engine or pushing past factory limits, piston quality directly determines whether your engine lives or fails under load. The WSM Piston Kit delivers OEM-equivalent construction with performance-oriented...01081905- SKU:
- 01081905
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 87.91 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
$98.28 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-819-10
WSM
$330.79A top-end rebuild is the most direct path to restoring lost compression, sealing blow-by, and recovering horsepower in a worn engine. The WSM Original Series kit eliminates the guesswork by bundling every critical component you need—pistons, rings, and...01081910- SKU:
- 01081910
- Availability:
- Ships Same Business Day
- Weight:
- 4.05 LBS
- BORE - OVERSIZE:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 87.91 MM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
$330.79 -
WSM Top-End Rebuild Kit - Original Series - .25 mm 010-819-11
WSM
$330.79A top-end rebuild is essential when your piston rings lose compression or your engine shows signs of blow-by—and this WSM kit delivers everything needed in one complete package. Factory OEM quality components paired with racing-grade needle bearings...01081911- SKU:
- 01081911
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 88.16 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,25 MM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$330.79 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-819-12
WSM
$330.79A top-end rebuild demands precision components that restore your engine to OEM specifications or better. The WSM Original Series kit supplies race-grade pistons, rings, and bearings in one complete package, eliminating the guesswork of sourcing...01081912- SKU:
- 01081912
- Availability:
- Ships Same Business Day
- Weight:
- 4.20 LBS
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 88.41 MM
$330.79 -
WSM Piston Kit - Kawasaki - Standard 010-820K
WSM
$89.33If you're running a Kawasaki engine that demands reliability under sustained high RPM, a quality piston kit is non-negotiable—it's the foundation of durability when power levels climb. The WSM Piston Kit delivers OEM-matching construction with genuine...010820- SKU:
- 010820
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
$89.33 -
WSM Piston Kit - Kawasaki 750 - +.5 mm 010-820-05K
WSM
$89.33Piston wear is one of the fastest paths to catastrophic engine failure, especially in high-performance Kawasaki 750 applications where heat and friction compound stress on critical components. The WSM Piston Kit delivers OEM-equivalent quality with...01082005- SKU:
- 01082005
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$89.33
