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
-
On Sale
WINDEROSA Complete Gasket Kit - Sea-Doo 611214
WINDEROSA
MSRP: $221.97Now: $142.00Was: $221.97Engine gasket failure leads to oil leaks, coolant seepage, and internal combustion loss—all of which compromise performance and can cause catastrophic engine damage if left unaddressed. The WINDEROSA Complete Gasket Kit delivers factory-specification...09342617- SKU:
- 09342617
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- COMPLETE
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
MSRP: $221.97Now: $142.00Was: $221.97 -
WINDEROSA Complete Gasket Kit - Sea-Doo 611215
WINDEROSA
$217.95Full engine gasket set includes bases, heads, intakes and crankshaft oil seals, Made in the U.S.A.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 810689
WINDEROSA
$73.37Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders, Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise, Nickel Silicon Carbide plated for...09342152- SKU:
- 09342152
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- STANDARD
$73.37 -
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 delivers a bolt-on cylinder solution with matched...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
$84.03Jet 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 seals engineered to restore original pump efficiency,...09351123- SKU:
- 09351123
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
$84.03 -
WINDEROSA Jet Pump Seal Kit 623119
WINDEROSA
$62.17WINDEROSA Jet Pump Seal Kit09351124- 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 Jet Pump Seal Kit 623121
WINDEROSA
$35.98Jet pump seal failure compromises cooling system integrity and leads to catastrophic engine damage—this kit delivers OEM-quality seals engineered to restore proper pump function and prevent costly coolant leaks. Whether you're rebuilding after wear or...09351126- SKU:
- 09351126
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- KIT
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- SEAL
$35.98 -
WINDEROSA Jet Pump Seal Kit 623123
WINDEROSA
$42.25Jet pump seals are critical wear items that degrade from constant exposure to saltwater, sand, and high-velocity water flow. A failing seal kit allows coolant bypass, loss of pressure, and potential engine damage—making replacement essential for reliable...09351128- SKU:
- 09351128
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$42.25 -
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 compression and eliminate seepage without requiring complete...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 catastrophic drivetrain failure. The WINDEROSA Drive Shaft...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
$12.98Jet 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 OEM-spec sealing integrity with factory-matched materials...09351131- SKU:
- 09351131
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- APPLICATION:
- JET PUMP
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- SEAL
$12.98 -
WINDEROSA Injector O-Ring Kit 625001
WINDEROSA
$24.95WINDEROSA Injector O-Ring Kit09351132- SKU:
- 09351132
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- FUEL INJECTOR
- PRODUCT NAME:
- O-RING
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$24.95 -
WINDEROSA Injector O-Ring Kit 625002
WINDEROSA
$62.45Fuel 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 O-Ring Kit 625002 provides OEM-equivalent replacement seals...09351133- SKU:
- 09351133
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- FUEL INJECTOR
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$62.45 -
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 625003 provides OEM-equivalent sealing surfaces to...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 - JT1500 611417
WINDEROSA
$373.45WINDEROSA Gasket - Complete - JT150009346562- SKU:
- 09346562
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
$373.45Qty in Cart: 0Quantity:Price:$373.45Subtotal: -
WINDEROSA Gasket - Complete - JT1500 Ultra 611419
WINDEROSA
$398.33WINDEROSA Gasket - Complete - JT1500 Ultra09346563- SKU:
- 09346563
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
$398.33 -
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 guesswork by providing OEM-equivalent sealing surfaces...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 - Yamaha 611605
WINDEROSA
$103.88A complete gasket set is the foundation of a reliable engine rebuild or top-end refresh. WINDEROSA gaskets are precision-engineered to OEM specifications, ensuring proper sealing across all critical engine surfaces and eliminating the risk of coolant...09346566- SKU:
- 09346566
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
$103.88Qty in Cart: 0Quantity:Price:$103.88Subtotal: -
WINDEROSA Gasket - Complete - Polaris 611809
WINDEROSA
$103.01A 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, and loss of compression—all of which compromise...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
$103.01 -
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 700 engines delivers OEM-equivalent sealing performance...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
