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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Wrench Rabbit Yamaha YZ85 2002-2016 Complete Engine Rebuild Kit WR101-089
WRENCH RABBIT
$564.95When a two-stroke engine reaches the end of its service life, a complete rebuild is your most cost-effective path back to peak performance. The Wrench Rabbit YZ85 kit consolidates everything you...09031024- SKU:
- 09031024
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$564.95 -
WSM Crankshaft Assembly 010-1017WSM
WSM
$744.35A crankshaft assembly is the backbone of your engine's power delivery—any imbalance or wear directly compromises efficiency, reliability, and performance. The WSM 010-1017WSM is...09210224- SKU:
- 09210224
- Availability:
- Ships Same Business Day
- Weight:
- 20.95 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$744.35 -
WSM Crankshaft Assembly 010-1018WSM
WSM
$851.45A reliable crankshaft is the foundation of any solid engine build—it directly impacts power delivery, longevity, and overall drivetrain stability. The WSM 010-1018WSM is engineered to meet or exceed...09210225- SKU:
- 09210225
- Availability:
- Ships Same Business Day
- Weight:
- 25.20 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$851.45 -
WSM Crankshaft Assembly 010-1019WSM
WSM
$851.45A crankshaft assembly is the heart of your engine's reliability and power delivery—any imbalance or wear translates directly to performance loss and catastrophic failure. The WSM 010-1019WSM is...09210227- SKU:
- 09210227
- Availability:
- Ships Same Business Day
- Weight:
- 27.56 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
$851.45 -
WSM Piston Assembly - Kawasaki 15F - Standard 010-845K
WSM
$98.28A piston assembly is one of the most critical components in your engine—it directly impacts power delivery, thermal management, and long-term reliability. The WSM 15F piston assembly combines...09101980- SKU:
- 09101980
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 83.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$98.28 -
WSM Piston Assembly - Yamaha - +.5 mm 010-870-05K
WSM
$111.77When you're pushing your engine to the limit, stock pistons become your weak point. WSM's +.5mm 010 piston assembly delivers OEM-equivalent quality with measurable improvements in heat management and...09101983- SKU:
- 09101983
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 73.90 MM
- BORE - OVERSIZE:
- +0,50 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON KIT
$111.77 -
WSM Piston Assembly - Yamaha - +.25 mm 010-871-04K
WSM
$108.22When you're pushing your engine to its limits, a stock piston assembly becomes your bottleneck. The WSM Piston Assembly delivers OEM-quality construction with thermal management features that reduce...09101985- SKU:
- 09101985
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- UNITS:
- KIT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 75.90 MM
- RIDING STYLE:
- WATERCRAFT
$108.22 -
WSM Piston Assembly - Yamaha - Standard 010-872K
WSM
$110.44A piston assembly is the heart of your engine's power delivery, and choosing the right one directly impacts performance, reliability, and longevity. The WSM Piston Assembly for Yamaha engines...09101986- SKU:
- 09101986
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- BORE SIZE METRIC:
- 75.90 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$110.44 -
WSM Piston Assembly - Yamaha - +.25 mm 010-872-04K
WSM
$141.11Piston durability and heat management directly impact engine longevity and power output, especially in high-stress racing applications. The WSM +.25mm piston assembly delivers OEM-quality...09101987- SKU:
- 09101987
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +0.25 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,25 MM
- BORE SIZE METRIC:
- 75.90 MM
- MODEL:
- ORIGINAL
$141.11 -
WSM Piston Assembly - Yamaha - +.5 mm 010-872-05K
WSM
$151.13Peak engine performance depends on pistons that can withstand extreme combustion pressures while minimizing friction and heat loss. The WSM +.5mm piston assembly delivers OEM-matching quality with...09101988- SKU:
- 09101988
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 75.90 MM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- ORIGINAL
$151.13 -
WSM Piston Assembly - Sea-Doo - Standard 010-818PK
WSM
$98.28A piston assembly is the heart of your Sea-Doo engine—responsible for converting combustion into horsepower and handling extreme thermal stress. This WSM assembly meets or exceeds OEM specifications...09101261- SKU:
- 09101261
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- MODEL:
- PLATINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 82.00 MM
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-818-05PK
WSM
$98.28A piston assembly is the heart of your engine's combustion cycle—it needs to withstand extreme temperatures and pressures while maintaining precision tolerances. The WSM Piston Assembly for Sea-Doo...09101262- SKU:
- 09101262
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PLATINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 82.00 MM
- UNITS:
- KIT
$98.28Qty in Cart: 0Quantity:Price:$98.28Subtotal: -
WSM Piston Assembly - Sea-Doo - Standard 010-809PK
WSM
$112.59A piston assembly is one of the highest-wear components in your Sea-Doo engine, directly affecting combustion efficiency, power output, and engine longevity. The WSM Standard 010-809PK is engineered...09101264- SKU:
- 09101264
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
- BORE SIZE METRIC:
- 87.91 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- MODEL:
- PLATINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
$112.59 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-809-05PK
WSM
$112.59A piston assembly is the core of your engine's combustion cycle—it's where power is generated and lost through heat and friction. The WSM +.5mm piston assembly for Sea-Doo jet skis delivers...09101265- SKU:
- 09101265
- Availability:
- Ships Same Business Day
- Weight:
- 1.49 LBS
- BORE SIZE METRIC:
- 87.91 MM
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- KIT
$112.59 -
WSM Piston Assembly - Sea-Doo - +1 mm 010-809-07PK
WSM
$112.59A piston assembly is the heart of your Sea-Doo's combustion chamber—and WSM's +1 mm 010-809-07PK is engineered to deliver measurable gains in power and durability without compromise. The MOS2-coated...09101266- SKU:
- 09101266
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 87.91 MM
- MODEL:
- PLATINUM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +1,00 MM
- UNITS:
- KIT
$112.59Qty in Cart: 0Quantity:Price:$112.59Subtotal: -
WSM Piston Assembly - Sea-Doo - Standard 010-824PK
WSM
$116.17A piston assembly is the foundation of reliable engine performance—it's where combustion power translates into usable horsepower. The WSM Piston Assembly for Sea-Doo engines delivers OEM-quality...09101267- SKU:
- 09101267
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
$116.17Qty in Cart: 0Quantity:Price:$116.17Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-817-12
WSM
$223.48A top-end rebuild demands precision components that can withstand extreme combustion pressures and maintain clearances across repeated heat cycles. The WSM Original Series kit eliminates guesswork by...09030035- SKU:
- 09030035
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 82.50 MM
- PISTON SIZE METRIC:
- +0.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-817-10
WSM
$223.48A top-end rebuild demands precision components that restore your engine's compression, ring seal, and combustion efficiency to factory specifications—or better. The WSM Original Series kit delivers...09030034- SKU:
- 09030034
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 82.00 MM
- PISTON SIZE METRIC:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-817-14
WSM
$223.48A top-end rebuild demands precision components that restore your engine to factory specifications or better. The WSM Original Series kit consolidates everything you need in one package—pistons,...09030036- SKU:
- 09030036
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 83.00 MM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$223.48Qty in Cart: 0Quantity:Price:$223.48Subtotal: -
WSM Top-End Rebuild Kit - Platinum Series - .50 mm 010-808-12P
WSM
$250.31A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained RPM loads. The WSM Platinum Series kit eliminates the guesswork by pairing OEM-quality...09030744- SKU:
- 09030744
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- PISTON SIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- PLATINUM SERIES
- BORE SIZE METRIC:
- 82.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$250.31
