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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WINDEROSA Gasket - Complete - Ultra 150 611411
WINDEROSA
$185.08WINDEROSA Gasket - Complete - Ultra 15009346561- SKU:
- 09346561
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
- UNITS:
- KIT
$185.08 -
WINDEROSA Complete Gasket Kit - Sea-Doo 611210
WINDEROSA
$174.92Full engine gasket set includes bases, heads, intakes and crankshaft oil seals, Made in the U.S.A.09342184- SKU:
- 09342184
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- COMPLETE
$174.92 -
WINDEROSA Top End Gasket Kit - Sea-Doo 610210
WINDEROSA
$142.28A reliable top-end gasket kit is essential for maintaining proper compression and preventing coolant or oil seepage that can compromise engine performance and longevity. The WINDEROSA 610210 delivers OEM-quality gasket materials engineered to withstand...09342185- SKU:
- 09342185
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$142.28 -
WINDEROSA Carb Base Gasket - Keihin 38M 619127
WINDEROSA
$11.28A worn or deteriorated carb base gasket creates vacuum leaks that compromise fuel delivery, idle quality, and overall engine performance. This WINDEROSA gasket is engineered from compressed micropore material to deliver a reliable, long-lasting seal on...09342624- SKU:
- 09342624
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CARBURETOR INTAKE
- BORE SIZE:
- 38,00 MM
- BORE SIZE METRIC:
- 38.00 MM
- MATERIAL:
- MICROPORE COMPOUND
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- RIDING STYLE:
- WATERCRAFT
- STYLE:
- KEIHIN
$11.28Qty in Cart: 0Quantity:Price:$11.28Subtotal: -
WINDEROSA Carb Base Gasket - Keihin 40M 619128
WINDEROSA
$11.28A worn or degraded carb base gasket compromises fuel delivery precision and allows vacuum leaks that destabilize idle quality and throttle response. The WINDEROSA 619128 is engineered from compressed micropore material to deliver reliable, long-term...09342625- SKU:
- 09342625
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE:
- 40,00 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CARBURETOR INTAKE
- BORE SIZE METRIC:
- 40.00 MM
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- MICROPORE COMPOUND
- STYLE:
- KEIHIN
- UNITS:
- 10 PACK
$11.28 -
WINDEROSA Drive Shaft Seal Kit 624103
WINDEROSA
$21.97WINDEROSA Drive Shaft Seal Kit09351118- SKU:
- 09351118
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- DRIVE SHAFT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$21.97 -
WINDEROSA Injector O-Ring Kit 625009
WINDEROSA
$18.70WINDEROSA Injector O-Ring Kit09351139- SKU:
- 09351139
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- APPLICATION:
- FUEL INJECTOR
- UNITS:
- KIT
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- WATERCRAFT
$18.70 -
WINDEROSA Injector O-Ring Kit 625011
WINDEROSA
$24.95Fuel injector seals degrade over time, leading to leaks, poor atomization, and inconsistent fuel delivery that compromises engine performance and efficiency. The WINDEROSA Injector O-Ring Kit 625011 provides OEM-quality replacement seals to restore...09351141- SKU:
- 09351141
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- FUEL INJECTOR
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- O-RING
$24.95 -
WINDEROSA Injector O-Ring Kit 625015
WINDEROSA
$37.45Fuel injector o-ring degradation is a silent performance killer—dried, cracked, or worn seals cause fuel leakage, poor atomization, and rough idle that diagnostic tools often miss. The WINDEROSA Injector O-Ring Kit 625015 provides OEM-quality replacement...09351145- SKU:
- 09351145
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- O-RING
- APPLICATION:
- FUEL INJECTOR
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$37.45 -
WINDEROSA Injector O-Ring Kit 625016
WINDEROSA
$37.45WINDEROSA Injector O-Ring Kit09351146- SKU:
- 09351146
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- FUEL INJECTOR
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$37.45 -
WINDEROSA Injector O-Ring Kit 625017
WINDEROSA
$19.95WINDEROSA Injector O-Ring Kit09351147- SKU:
- 09351147
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- APPLICATION:
- FUEL INJECTOR
- PRODUCT NAME:
- O-RING
$19.95 -
WINDEROSA Gasket - Top End - JS440 610102
WINDEROSA
$47.70Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346544- SKU:
- 09346544
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$47.70 -
WINDEROSA Gasket - Top End - GP1300 610107
WINDEROSA
$235.47Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346545- SKU:
- 09346545
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$235.47 -
WINDEROSA Gasket - Top End 610110
WINDEROSA
$47.90A blown or deteriorated gasket seal compromises compression, causes coolant and oil leaks, and tanks engine efficiency—costing you performance and reliability on the track or in the garage. The WINDEROSA Gasket Top End 610110 delivers a complete,...09346546- SKU:
- 09346546
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$47.90 -
WINDEROSA Gasket - Top End - 500 Jammer 610114
WINDEROSA
$57.09Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346547- SKU:
- 09346547
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$57.09 -
WINDEROSA Gasket - Top End - Jet Boat 610214
WINDEROSA
$168.11A leaking top-end gasket set compromises sealing integrity and forces coolant and oil past critical junctures, leading to performance loss and potential engine damage. The WINDEROSA 610214 delivers comprehensive gasket coverage for your jet boat's top...09346548- SKU:
- 09346548
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$168.11 -
WINDEROSA Gasket - Top End - 900 Ace 610216
WINDEROSA
$168.11Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346549- SKU:
- 09346549
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$168.11Qty in Cart: 0Quantity:Price:$168.11Subtotal: -
WINDEROSA Gasket - Top End - JS800 610409
WINDEROSA
$104.45A top-end gasket set is essential maintenance for any JS800 engine—proper sealing prevents oil and coolant leaks while maintaining compression integrity across your cylinder head and intake/exhaust ports. WINDEROSA's U.S.-manufactured gasket set...09346551- SKU:
- 09346551
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$104.45 -
WINDEROSA Standard Bore Gasket Kit 810482
WINDEROSA
$90.92Ready-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...09344055- SKU:
- 09344055
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- STANDARD
$90.92Qty in Cart: 0Quantity:Price:$90.92Subtotal: -
WINDEROSA Top End Gasket Kit - Sea-Doo 610211
WINDEROSA
$127.08A reliable top-end gasket kit is essential for maintaining compression integrity and preventing coolant or oil seepage in high-performance engines. The WINDEROSA 610211 delivers OEM-quality sealing across critical contact points, ensuring your Sea-Doo...09342615- SKU:
- 09342615
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$127.08Qty in Cart: 0Quantity:Price:$127.08Subtotal:
