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 Short Shaft Pump - Sea-Doo 010-092
WSM
$43.31Replacement long shaft for WSM oil pumps09320079- SKU:
- 09320079
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL PUMP
$43.31 -
WSM Pump Rotor - 4-TEC - Sea-Doo 010-093
WSM
$27.54Replacement long shaft for WSM oil pumps09320080- SKU:
- 09320080
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- TYPE:
- OIL PUMP
- UNITS:
- EACH
- PRODUCT NAME:
- ROTOR
- RIDING STYLE:
- WATERCRAFT
$27.54 -
WSM Cylinder Kit - Yamaha 010-6029K
WSM
$729.92Exact OEM replica, Nikasil bore plating, High strength, heat-resistant alloy valve with safety link, Moly-coated piston kit with wrist pin clips, High-quality Japanese rings exceed OEM, Kit includes 1 cylinder, 1 piston kit and 1 power valve09310530- SKU:
- 09310530
- Availability:
- Ships Same Business Day
- Weight:
- 7.81 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NIKASIL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$729.92 -
WSM Power Valve with Safety Link 010-497-01
WSM
$108.42Fine tunes exhaust for peak performance09262253- SKU:
- 09262253
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- POWER VALVE
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$108.42 -
WSM Crankshaft Assembly 010-1028WSM
WSM
$865.62Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210483- SKU:
- 09210483
- Availability:
- Ships Same Business Day
- Weight:
- 28.95 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$865.62 -
WSM Crankshaft Assembly 010-1028-01WSM
WSM
$1,165.75Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210484- SKU:
- 09210484
- Availability:
- Ships Same Business Day
- Weight:
- 42.80 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$1,165.75 -
WSM Crankshaft Assembly 010-1060WSM
WSM
$764.06Complete crankshaft assembly with connecting rod, Will meet or exceed OEM performance, Trued to OEM specifications, Multi-cylinder applications include main bearings, Rebuildable, Ready for installation09210485- SKU:
- 09210485
- Availability:
- Ships Same Business Day
- Weight:
- 24.10 LBS
- PRODUCT NAME:
- CRANKSHAFT
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- UNITS:
- EACH
$764.06 -
WSM Ring Set 010-909
WSM
$41.33Order one per cylinder09120260- SKU:
- 09120260
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
$41.33 -
WSM Ring Set 010-909-07
WSM
$40.52Order one per cylinder09120262- SKU:
- 09120262
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BORE - OVERSIZE:
- +1,00 MM
- UNITS:
- SET
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
$40.52 -
WSM Ring Set 010-924
WSM
$33.53Order one per cylinder09120263- SKU:
- 09120263
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
$33.53 -
WSM Ring Set 010-960
WSM
$59.09Order one per cylinder09120266- SKU:
- 09120266
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
$59.09 -
WSM Ring Set 010-960-05
WSM
$59.10Order one per cylinder09120267- SKU:
- 09120267
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON RING
- BORE - OVERSIZE:
- +0,50 MM
- UNITS:
- SET
$59.10 -
WSM Ring Set 010-944
WSM
$39.36Order one per cylinder09110010- SKU:
- 09110010
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
$39.36 -
WSM Ring Set 010-970
WSM
$30.88Order one per cylinder09110012- SKU:
- 09110012
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
$30.88 -
WSM Ring Set 010-972
WSM
$44.91Order one per cylinder09110014- SKU:
- 09110014
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- SET
$44.91 -
WSM Ring Set 010-972-04
WSM
$44.03Order one per cylinder09110015- 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
$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 installation09210231- SKU:
- 09210231
- Availability:
- Ships Same Business Day
- Weight:
- 31.16 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$810.90 -
WSM Piston Assembly - Kawasaki 12F - Standard 010-844K
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...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
$93.60 -
WSM Piston Assembly - Sea-Doo - Standard 010-860PK
WSM
$136.64Quality 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...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
$136.64 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-860-05PK
WSM
$136.64Quality 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...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
$136.64
