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 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...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...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...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
$21.97Drive shaft seals are critical to preventing fluid loss and contamination in your drivetrain—neglecting them leads to costly damage and performance degradation. The WINDEROSA 624103 kit provides...09351118- 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
$18.70Fuel injector leaks compromise engine performance and waste fuel—often causing rough idling, poor cold starts, and increased emissions. The WINDEROSA Injector O-Ring Kit 625009 provides OEM-quality...09351139- 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...09351141- SKU:
- 09351141
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- APPLICATION:
- FUEL INJECTOR
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- O-RING
$24.95Qty in Cart: 0Quantity:Price:$24.95Subtotal: -
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...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
$37.45Fuel injector leaks compromise both performance and reliability, often going undetected until they cause misfires or rough idle conditions. The WINDEROSA Injector O-Ring Kit 625016 provides...09351146- 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
$19.95Fuel injector o-ring degradation is one of the most common causes of fuel system leaks and performance loss in high-revving engines. The WINDEROSA Injector O-Ring Kit 625017 provides OEM-quality...09351147- 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
$47.70A properly sealed top end is non-negotiable for reliable engine performance and longevity. This WINDEROSA gasket set eliminates the guesswork by providing OEM-quality sealing surfaces across all...09346544- SKU:
- 09346544
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$47.70Qty in Cart: 0Quantity:Price:$47.70Subtotal: -
WINDEROSA Gasket - Top End - GP1300 610107
WINDEROSA
$235.47A leaking or compromised top-end gasket set will rob your GP1300 of power, reliability, and resale value. This WINDEROSA gasket set includes everything you need for a complete top-end rebuild—bases,...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...09346546- SKU:
- 09346546
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$47.90Qty in Cart: 0Quantity:Price:$47.90Subtotal: -
WINDEROSA Gasket - Top End - 500 Jammer 610114
WINDEROSA
$57.09A properly sealed top end is non-negotiable for engine reliability and peak performance. The WINDEROSA Gasket Set for the 500 Jammer eliminates common leak points and maintains compression integrity...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...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
$168.11A quality top-end gasket set is essential for maintaining compression integrity and preventing coolant or oil seepage in your 900 Ace engine. The WINDEROSA 610216 delivers OEM-grade sealing with 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...09346551- SKU:
- 09346551
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$104.45Qty in Cart: 0Quantity:Price:$104.45Subtotal: -
WINDEROSA Standard Bore Gasket Kit 810482
WINDEROSA
$90.92When your engine takes a beating on the track or trail, worn cylinders compromise compression, power delivery, and reliability. The WINDEROSA Standard Bore Gasket Kit 810482 gives you a complete,...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
$90.92 -
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...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: -
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...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
$217.95A 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
