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 Crankshaft Assembly 010-1019WSM
WSM
$810.90Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210227- SKU:
- 09210227
- Availability:
- Ships Same Business Day
- Weight:
- 27.55 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
$810.90 -
WSM Piston Assembly - Kawasaki 15F - Standard 010-845K
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Assembly - Yamaha - +.5 mm 010-870-05K
WSM
$106.45Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101983- SKU:
- 09101983
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 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
$106.45 -
WSM Piston Assembly - Yamaha - +.25 mm 010-871-04K
WSM
$110.38Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to 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
$110.38 -
WSM Piston Assembly - Yamaha - Standard 010-872K
WSM
$112.19Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101986- SKU:
- 09101986
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 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
$112.19 -
WSM Piston Assembly - Yamaha - +.25 mm 010-872-04K
WSM
$143.93Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$143.93 -
WSM Piston Assembly - Yamaha - +.5 mm 010-872-05K
WSM
$143.93Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...09101988- SKU:
- 09101988
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 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
$143.93 -
WSM Piston Assembly - Sea-Doo - Standard 010-818PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-818-05PK
WSM
$93.60Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$93.60 -
WSM Piston Assembly - Sea-Doo - Standard 010-809PK
WSM
$107.23Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$107.23 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-809-05PK
WSM
$107.23Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$107.23 -
WSM Piston Assembly - Sea-Doo - +1 mm 010-809-07PK
WSM
$107.23Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$107.23 -
WSM Piston Assembly - Sea-Doo - Standard 010-824PK
WSM
$110.64Quality and construction that meets or exceeds OEM, Feature improved E-clip design, Contain piston, rings, pin and clips, Additional rings available separately, Order one per cylinder, Skirts have a nonabrasive, expansion-retarding MOS2 coating to reduce...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
$110.64 -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-817-12
WSM
$212.84Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030035- 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
$212.84 -
WSM Top-End Rebuild Kit - Original Series - Standard 010-817-10
WSM
$212.84Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030034- 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
$212.84 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-817-14
WSM
$212.84Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030036- 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
$212.84 -
WSM Top-End Rebuild Kit - Platinum Series - .50 mm 010-808-12P
WSM
$238.39Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030744- 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
$238.39 -
WSM Top-End Rebuild Kit - Platinum Series - 1 mm 010-808-14P
WSM
$238.39Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030745- SKU:
- 09030745
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 83.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$238.39 -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-809-10P
WSM
$323.56Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030746- SKU:
- 09030746
- Availability:
- Ships Same Business Day
- Weight:
- 4.00 LBS
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 87.91 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$323.56 -
WSM Top-End Rebuild Kit - Platinum Series - .50 mm 010-809-12P
WSM
$323.56Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030747- SKU:
- 09030747
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- MODEL:
- PLATINUM SERIES
- TYPE:
- TOP END
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.41 MM
- PISTON SIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$323.56
