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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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WINDEROSA Complete Gasket Kit - Sea-Doo 611215
WINDEROSA
$217.95A complete gasket failure can sideline your Sea-Doo and turn a weekend on the water into a costly nightmare. The WINDEROSA Complete Gasket Kit eliminates guesswork by providing every seal and gasket...09342618- SKU:
- 09342618
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- COMPLETE
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
$217.95 -
WINDEROSA Standard Bore Gasket Kit 810276
WINDEROSA
$106.28When your engine's cylinder wear compromises compression and performance, a complete rebore kit saves you from costly machine work and extended downtime. The WINDEROSA Standard Bore Gasket Kit 810276...09341934- SKU:
- 09341934
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- STYLE:
- STANDARD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
$106.28 -
WINDEROSA Jet Pump Seal Kit 623117
WINDEROSA
$15.17Jet pump seal degradation is one of the most common causes of performance loss and cavitation in high-performance watercraft. The WINDEROSA Jet Pump Seal Kit 623117 provides OEM-quality replacement...09351123- SKU:
- 09351123
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
$15.17 -
WINDEROSA Jet Pump Seal Kit 623119
WINDEROSA
$62.17A worn jet pump seal kit is one of the fastest ways to lose performance and invite water into critical engine components. The WINDEROSA 623119 restores proper pump operation and sealing integrity,...09351124- SKU:
- 09351124
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
$62.17 -
WINDEROSA Drive Shaft Seal Kit 624113
WINDEROSA
$44.80Drive shaft seals are critical to preventing fluid leakage and protecting your drivetrain from contamination. The WINDEROSA 624113 kit provides OEM-quality replacement seals that restore proper...09351129- SKU:
- 09351129
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- DRIVE SHAFT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$44.80 -
WINDEROSA Drive Shaft Seal Kit 624112
WINDEROSA
$14.00Drive shaft seals are critical to preventing fluid leakage and protecting internal drivetrain components from contamination. A compromised seal can lead to rapid fluid loss, bearing damage, and...09351130- SKU:
- 09351130
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- DRIVE SHAFT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$14.00 -
WINDEROSA Jet Pump Seal Kit 623802
WINDEROSA
$11.25Jet pump seal degradation compromises water flow efficiency and allows internal leakage that reduces thrust output and increases fuel consumption. The WINDEROSA Jet Pump Seal Kit 623802 restores...09351131- SKU:
- 09351131
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- SEAL
$11.25 -
WINDEROSA Injector O-Ring Kit 625001
WINDEROSA
$21.12Fuel injector o-ring degradation is a common culprit behind fuel leaks, rough idle, and poor atomization—problems that compromise both performance and reliability. The WINDEROSA Injector O-Ring Kit...09351132- SKU:
- 09351132
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- FUEL INJECTOR
- PRODUCT NAME:
- O-RING
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$21.12 -
WINDEROSA Injector O-Ring Kit 625002
WINDEROSA
$16.38Fuel injector o-ring degradation is one of the most common causes of lean running conditions, fuel leaks, and rough idle—problems that compound quickly without attention. The WINDEROSA Injector...09351133- SKU:
- 09351133
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- FUEL INJECTOR
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$16.38 -
WINDEROSA Injector O-Ring Kit 625003
WINDEROSA
$15.47Fuel injector o-ring degradation is a common culprit behind lean conditions, hard starts, and fuel system leaks that compromise engine performance and reliability. The WINDEROSA Injector O-Ring Kit...09351134- SKU:
- 09351134
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- O-RING
- APPLICATION:
- FUEL INJECTOR
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$15.47 -
WINDEROSA Gasket - Complete - Ultra 310 611421
WINDEROSA
$410.75A complete gasket set is the foundation of engine reliability—worn or damaged gaskets lead to compression loss, oil leaks, and catastrophic failure. The WINDEROSA Gasket Complete set eliminates...09346565- SKU:
- 09346565
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$410.75 -
WINDEROSA Gasket - Complete - Polaris 611809
WINDEROSA
$74.25A complete gasket set is critical to maintaining a proper seal throughout your engine's combustion chambers and fluid passages. When gaskets deteriorate or fail, you risk oil leaks, coolant seepage,...09346567- SKU:
- 09346567
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- UNITS:
- KIT
$74.25 -
WINDEROSA Gasket - Complete - Virage 700 611813
WINDEROSA
$90.12A complete gasket set is essential for any engine rebuild or overhaul, ensuring proper sealing across all critical combustion chamber and fluid passages. The WINDEROSA Gasket - Complete for Virage...09346569- SKU:
- 09346569
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
$90.12 -
WINDEROSA Universal Gasket Sheet - 6 x 6 310101
WINDEROSA
$17.88A quality gasket sheet is non-negotiable for any serious engine builder or mechanic. WINDEROSA's universal gasket material gives you the flexibility to cut custom gaskets for virtually any...09346883- SKU:
- 09346883
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET MATERIAL
$17.88 -
WINDEROSA Universal Gasket - 8 x 8 310102
WINDEROSA
$31.29A quality gasket is foundational to reliable engine sealing—leaks compromise performance and invite catastrophic engine damage. WINDEROSA universal gaskets deliver consistent compression across...09346884- SKU:
- 09346884
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- GASKET MATERIAL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$31.29 -
WINDEROSA Universal Gasket Kit 310113
WINDEROSA
$32.34A blown gasket can sideline your engine faster than you'd expect, compromising compression and reliability when you need it most. The WINDEROSA Universal Gasket Kit 310113 delivers OEM-quality...09346885- SKU:
- 09346885
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$32.34 -
WINDEROSA Universal Gasket Kit - 12 x 18 310114
WINDEROSA
$33.68A reliable gasket kit is non-negotiable for any engine rebuild or top-end refresh. Engine sealing integrity directly impacts compression, prevents fluid leakage, and protects against...09346886- SKU:
- 09346886
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$33.68 -
WINDEROSA Universal Gasket - Exhaust 310115
WINDEROSA
$23.50A quality exhaust gasket is critical to maintaining a reliable seal between engine components and preventing exhaust leaks that compromise performance and increase emissions. The WINDEROSA Universal...09346887- SKU:
- 09346887
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- GASKET MATERIAL
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$23.50 -
WINDEROSA Gasket Kit - Standard Bore 810372
WINDEROSA
$83.58A complete gasket kit is fundamental to engine reliability—it seals critical junctions between engine components to prevent fluid leakage and maintain compression integrity. The WINDEROSA Gasket Kit...09346008- SKU:
- 09346008
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
$83.58 -
WINDEROSA Standard Bore Gasket Kit 810670
WINDEROSA
$35.95When your engine demands a fresh start, a worn cylinder is no place to compromise. The WINDEROSA Standard Bore Gasket Kit delivers a complete, ready-to-install solution that restores OEM performance...09344049- SKU:
- 09344049
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- STYLE:
- STANDARD
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$35.95
