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
-
WSM Ring Set 010-972-04
WSM
$44.03Proper ring sealing is non-negotiable for engine performance and longevity. The WSM Ring Set 010-972-04 delivers precise bore clearances and consistent compression across the entire power band,...09110015- SKU:
- 09110015
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
$44.03 -
WSM Crankshaft Assembly 010-1026WSM
WSM
$851.45A reliable crankshaft assembly is the foundation of engine durability and consistent performance—especially under high RPM and load conditions. The WSM Crankshaft Assembly 010-1026WSM delivers...09210231- SKU:
- 09210231
- Availability:
- Ships Same Business Day
- Weight:
- 31.16 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$851.45 -
WSM Piston Assembly - Kawasaki 12F - Standard 010-844K
WSM
$98.28A piston assembly is the heart of your engine's combustion cycle—when it wears, power fades and reliability suffers. The WSM Piston Assembly for Kawasaki 12F delivers OEM-equivalent quality with...09101978- SKU:
- 09101978
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 83.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$98.28 -
WSM Piston Assembly - Sea-Doo - Standard 010-860PK
WSM
$143.47A piston assembly is the engine's hardworking core—it compresses the fuel-air mixture, converts combustion into power, and dissipates extreme heat cycle after cycle. The WSM Piston Assembly for...09101270- SKU:
- 09101270
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE SIZE METRIC:
- 99.96 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PLATINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$143.47Qty in Cart: 0Quantity:Price:$143.47Subtotal: -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-860-05PK
WSM
$143.47A piston assembly is the heart of your engine's combustion cycle—and when it fails or wears, your entire powerplant suffers. The WSM Piston Assembly delivers OEM-equivalent quality with measurable...09101271- SKU:
- 09101271
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 99.96 MM
- MODEL:
- PLATINUM
$143.47Qty in Cart: 0Quantity:Price:$143.47Subtotal: -
WSM Piston Assembly - Sea-Doo - Standard 010-861PK
WSM
$133.96A piston assembly is the heart of your engine's power delivery—when it fails or wears, you lose compression, efficiency, and reliability. The WSM Piston Assembly for Sea-Doo meets or exceeds OEM...09101272- SKU:
- 09101272
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$133.96Qty in Cart: 0Quantity:Price:$133.96Subtotal: -
WSM Piston Assembly - Sea-Doo - Standard 010-862K
WSM
$242.28A piston assembly is critical to your engine's efficiency and reliability—it directly impacts compression, heat management, and power output. The WSM Piston Assembly for Sea-Doo delivers OEM-grade...09101274- SKU:
- 09101274
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 99.96 MM
- UNITS:
- KIT
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
$242.28 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-862-05K
WSM
$242.28A high-revving engine demands pistons engineered for sustained performance under extreme conditions. The WSM Piston Assembly delivers OEM-equivalent quality with advanced thermal management and...09101275- SKU:
- 09101275
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$242.28 -
WSM Piston Kit - Kawasaki - +1 mm 010-843-07K
WSM
$98.28Whether you're rebuilding a two-stroke engine or maximizing performance in a high-rpm application, piston quality directly impacts power delivery, reliability, and engine longevity. The WSM Piston...09100651- SKU:
- 09100651
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- MODEL:
- ORIGINAL
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
WSM Piston Kit - Polaris - Standard 010-835K
WSM
$89.33Stock pistons wear down under sustained high-RPM operation, leading to blow-by, compression loss, and reduced power output. The WSM Piston Kit delivers OEM-equivalent quality with engineering...09100655- SKU:
- 09100655
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$89.33 -
WSM Piston Kit - Polaris - +.5 mm 010-835-05K
WSM
$89.33When your engine is pushing hard, piston quality becomes non-negotiable. The WSM Piston Kit delivers OEM-equivalent construction with measurable performance gains through advanced materials and...09100656- SKU:
- 09100656
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$89.33Qty in Cart: 0Quantity:Price:$89.33Subtotal: -
WSM Piston Kit - Polaris - +1 mm 010-835-07K
WSM
$89.33When you're pushing your Polaris to the limit, stock pistons become your bottleneck—they're simply not engineered for sustained high-performance demands. The WSM Piston Kit delivers OEM-equivalent...09100657- SKU:
- 09100657
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- MODEL:
- ORIGINAL
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Yamaha - Standard 010-827K
WSM
$80.40A piston kit is only as good as its ability to withstand extreme combustion pressures while maintaining thermal efficiency—and the WSM Piston Kit delivers on both fronts. The MOS2 coating on the...09100659- SKU:
- 09100659
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$80.40 -
WSM Piston Kit - Yamaha - +.5 mm 010-827-05K
WSM
$80.40A worn or damaged piston directly limits your engine's ability to produce consistent power and can lead to catastrophic failure if left unchecked. The WSM Piston Kit delivers OEM-equivalent quality...09100660- SKU:
- 09100660
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$80.40 -
WSM Piston Kit - Yamaha - +1 mm 010-827-07K
WSM
$80.40If you're rebuilding a Yamaha engine or pushing higher compression ratios, piston quality directly impacts reliability, power output, and engine longevity. The WSM +1mm 010-827-07K kit delivers...09100661- SKU:
- 09100661
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
$80.40 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-819-14
WSM
$330.79A complete top-end rebuild demands precision components that won't compromise engine integrity or performance. The WSM Original Series kit delivers OEM-quality pistons, rings, and bearings in one...09030122- SKU:
- 09030122
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.91 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
$330.79 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-827-14
WSM
$241.36A top-end rebuild demands precision components that won't compromise your engine's reliability or performance. The WSM Original Series kit delivers OEM-quality pistons, rings, and bearings engineered...09030125- SKU:
- 09030125
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
$241.36Qty in Cart: 0Quantity:Price:$241.36Subtotal: -
WSM Oil Filter - Sea-Doo 2-Stroke 006-546
WSM
$8.60Proper oil filtration is critical for 2-stroke performance—contaminants in your oil system accelerate wear on rings, bearings, and piskets, cutting engine life short. The WSM Oil Filter 006-546 is...07120178- SKU:
- 07120178
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- COLOR/FINISH:
- WHITE
- PRODUCT NAME:
- OIL-INJECTION FILTER
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CARTRIDGE
- STYLE:
- 2-STROKE
- STYLE:
- SEA-DOO
- UNITS:
- EACH
- BASE COLOR:
- WHITE
- MATERIAL:
- PLASTIC
$8.60 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-861-05PK
WSM
$133.96OEM-quality pistons are the foundation of reliable engine performance, and this WSM assembly delivers durability without compromise. The advanced MOS2 coating reduces friction and heat while actively...09101273- SKU:
- 09101273
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$133.96 -
XCELDYNE Intake Valve XIVM13001
XCELDYNE
$198.35Stock intake valves limit your engine's breathing potential and cap horsepower gains from other modifications. The XCELDYNE Intake Valve XIVM13001 delivers measurable airflow improvements through...09260469- SKU:
- 09260469
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- OVERSIZE (+1.00 MM)
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$198.35
