Harley Engine
Harley Bike Engine Parts at JJ Motorsports
Rebuild and boost your Harley's engine with premium parts from JJ Motorsports. Our inventory features complete gasket sets, piston kits, oil filters, pushrod tubes, and coolers designed for maximum strength, leak-free sealing, and high-performance in extreme conditions. Compatible with Big Twins, Softail, Touring, and more, these components support top-end overhauls, oil management, and durability for street rides or custom builds.
Shop trusted brands like Drag Specialties for magnetic filters and Wiseco for forged pistons. Explore related categories such as Harley air and fuel for carb tuning or Harley drivetrain for transmission upgrades.
Top Harley Engine Products
- DRAG SPECIALTIES Magnetic Ring Oil Filter - Chrome - 3-1/4" 140003HP-BX18 – Captures metal particles with pressure relief.
- WISECO Piston Kit .010 .883 XL K1656 – Forged aluminum with rings, pins, and circlips for rebuilds.
- DRAG SPECIALTIES Pushrod Tube Kit Big Twin 75711 – Includes tubes, clips, cups, and springs for complete engine.
- ULTRACOOL Below Regulator Mount Oil Cooler Stainless Steel RF-2CSS – Fits S&S 111/124/143 engines with machined adapter.
- PAUGHCO Ribbed Teardrop Air Cleaner 701-200 – Chrome-plated aluminum with mini filter.
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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COMETIC Tappet Pin Cover O-Ring C9296
COMETIC
$4.00A failing tappet pin cover O-ring will compromise your engine's seal integrity and lead to oil leakage that degrades performance and creates messy maintenance headaches. The COMETIC C9296 delivers the reliability you need with a precision-engineered seal...09350229- SKU:
- 09350229
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- TAPPET COVER
- MATERIAL:
- NITRILE
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
$4.00 -
On Sale
COMETIC Starter Gasket - AFM C9312F
COMETIC
Now: $6.00Was: $6.10A failing starter gasket compromises your engine's seal integrity and can lead to costly oil leaks and starter failure. The COMETIC C9312F is engineered to deliver a reliable, long-lasting seal that withstands repeated thermal cycles and engine vibration...09350238- SKU:
- 09350238
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- THICKNESS:
- 0,032'
- TYPE:
- MOTOR
- TYPE:
- STARTER
- THICKNESS IMPERIAL:
- 0.032'
- RIDING STYLE:
- STREET
Now: $6.00Was: $6.10 -
On Sale
COMETIC Cylinder Base Gasket Pair C10195
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55A quality cylinder base gasket is critical to maintaining reliable compression and preventing coolant leakage in high-stress engine environments. The COMETIC C10195 uses multi-layer steel construction with load-control embossments to distribute clamping...09345958- SKU:
- 09345958
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE IMPERIAL:
- 4.500'
- THICKNESS IMPERIAL:
- 0,014'
- UNITS:
- 2 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Top End Gasket Kit - Twin Cooled - .040" C10138
COMETIC
MSRP: $183.70Now: $173.00Was: $183.70A failed head gasket doesn't just sideline your engine—it compromises every system downstream. The COMETIC Top End Gasket Kit eliminates hot spots that cause premature failure by actively dissipating combustion heat across the entire gasket surface,...09344836- SKU:
- 09344836
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- VITON
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 4,000'
- DISPLACEMENT:
- 110'
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
MSRP: $183.70Now: $173.00Was: $183.70 -
On Sale
COMETIC Top End Gasket Kit - Twin Cam C9949
COMETIC
MSRP: $153.25Now: $144.00Was: $153.25A top-end rebuild demands precision gaskets that won't fail under sustained combustion heat and cylinder pressure. The COMETIC C9949 delivers that reliability with EST (Extreme Sealing Technology) gaskets engineered to eliminate hot spots and maintain...09344839- SKU:
- 09344839
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE:
- 4,000'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,010'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- DISPLACEMENT:
- 110'
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.25 MM
MSRP: $153.25Now: $144.00Was: $153.25 -
COMETIC Cam Cover Gasket C10146F1
COMETIC
$17.80A failing cam cover gasket leads to oil seepage, contaminated spark plug wells, and potential engine damage—problems that compound quickly if left unchecked. The COMETIC C10146F1 delivers a factory-grade seal with superior material composition and...09345062- SKU:
- 09345062
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- CAM COVER
- UNITS:
- EACH
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
$17.80 -
COMETIC Cam Cover Gasket C10146F5
COMETIC
$82.90A worn or compromised cam cover gasket is one of the quickest ways to develop oil seepage that compromises engine cleanliness and attracts dirt into your bay. COMETIC's C10146F5 cam cover gasket delivers OEM-level sealing performance with superior...09345063- SKU:
- 09345063
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- CAM COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- THICKNESS:
- 1,52 MM (0,060')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
$82.90 -
COMETIC Top End Gasket Kit - XL C9052
COMETIC
$75.55A leaking or failing top end gasket can sideline your engine and compromise combustion efficiency. The COMETIC C9052 addresses this with Extreme Sealing Technology (EST)—engineered to eliminate hot spots and distribute heat evenly across the gasket...09344656- SKU:
- 09344656
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- MODEL:
- EST
- THICKNESS IMPERIAL:
- 0,031'
- THICKNESS IMPERIAL:
- 0,032'
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- STYLE:
- HIGH COMPRESSION
- THICKNESS METRIC:
- 0.79 MM
$75.55 -
COMETIC Top End Gasket Kit - XL C9103
COMETIC
$75.55Gasket failure under high heat is one of the fastest ways to compromise engine integrity and sideline your build. The COMETIC Top End Gasket Kit C9103 uses Extreme Sealing Technology (EST) to eliminate hot spots and maintain a reliable seal across the...09344658- SKU:
- 09344658
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,031'
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 3.1875'
- UNITS:
- KIT
- MODEL:
- EST
- THICKNESS METRIC:
- 0.79 MM
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- THICKNESS IMPERIAL:
- 0,032'
$75.55 -
COMETIC Top End Gasket Kit - XL C9104
COMETIC
$75.55A failed head gasket doesn't just cost you race time—it costs you money and credibility. The COMETIC Top End Gasket Kit C9104 uses Extreme Sealing Technology (EST) to eliminate the hot spots and uneven heat distribution that cause premature gasket...09344659- SKU:
- 09344659
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MODEL:
- EST
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- STYLE:
- STANDARD
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TOP END
- THICKNESS IMPERIAL:
- 0,031'
$75.55 -
COMETIC Head Gasket C9137
COMETIC
$61.90A head gasket failure can compromise your engine's integrity and cost you valuable track time or rebuild expenses. The COMETIC C9137 is engineered with multi-layer steel construction and load-control embossments to maintain consistent sealing pressure...09344662- SKU:
- 09344662
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,045'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,14 MM (0,045')
- BORE SIZE:
- 3,750'
$61.90 -
COMETIC Engine Gasket Kit - Big Twin C9154
COMETIC
$246.70Engine gasket failure can compromise seal integrity and lead to costly leaks or catastrophic engine damage. The COMETIC C9154 Big Twin gasket kit delivers OEM-quality sealing with race-grade materials engineered to handle extreme combustion pressures and...09344663- SKU:
- 09344663
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,625'
- PRODUCT NAME:
- GASKET KIT
$246.70 -
COMETIC Cylinder Base Gasket C9206
COMETIC
$33.55A failing cylinder base gasket compromises combustion seal integrity, leading to oil weeping, pressure loss, and potential engine damage. The COMETIC C9206 delivers OEM-grade sealing reliability with premium materials engineered to handle Sportster...09344664- SKU:
- 09344664
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- MATERIAL:
- VITON
- TYPE:
- CYLINDER BASE
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
$33.55 -
COMETIC Cylinder Base Gasket C9207
COMETIC
$33.55A failed cylinder base gasket compromises compression, invites coolant and oil contamination, and can leave you stranded mid-season. The COMETIC C9207 is engineered to seal reliably under the extreme pressures and temperature cycling that Sportster...09344665- SKU:
- 09344665
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS IMPERIAL:
- 0,020'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS METRIC:
- 0.51 MM
$33.55 -
COMETIC Timing Cover Gasket C9306
COMETIC
$8.90A failing timing cover gasket compromises your engine's oil containment and invites contamination into critical engine components. The COMETIC C9306 is precision-engineered to seal reliably under high heat and pressure, protecting your investment and...09344666- SKU:
- 09344666
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- POINT COVER
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 0.79 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,79 MM (0,031')
- MATERIAL:
- FIBER
- TYPE:
- IGNITION COVER
$8.90 -
COMETIC Starter Motor Gasket C9312
COMETIC
$6.10A leaking starter motor gasket compromises engine sealing integrity and can lead to oil weepage that damages electrical components. The COMETIC C9312 delivers OEM-equivalent sealing performance with superior durability, ensuring your starter assembly...09344667- SKU:
- 09344667
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- MOTOR
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- TYPE:
- STATOR
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
$6.10 -
COMETIC Cam Gear Gasket - XL C9316F1
COMETIC
$18.85A failing cam gear gasket compromises oil sealing at one of the most critical junctures in your engine—leading to oil seepage, contamination, and potential bearing damage. The COMETIC Cam Gear Gasket XL C9316F1 delivers OEM-grade sealing with superior...09344668- SKU:
- 09344668
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CAM COVER
- UNITS:
- EACH
$18.85 -
COMETIC Circuit Breaker Gasket C9337
COMETIC
$4.20Gasket failure can sideline your engine faster than any other component—and racing demands zero tolerance for leaks. The COMETIC Circuit Breaker Gasket C9337 delivers a proven solution with its aluminum core construction and bonded nitrile rubber...09344685- SKU:
- 09344685
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CIRCUIT BREAKER COVER
$4.20 -
COMETIC Rocker Cover Gasket - Big Twin C9346
COMETIC
$17.90A leaking rocker cover gasket compromises engine sealing and invites oil contamination into your intake tract—exactly what your Big Twin doesn't need. The COMETIC C9346 delivers a precision seal using a stainless steel core with dual Viton rubber...09344687- SKU:
- 09344687
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- FELT
- THICKNESS:
- 3,20 MM (0,125')
- TYPE:
- ROCKER COVER
- THICKNESS METRIC:
- 3.20 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,125'
- UNITS:
- 10 PACK
$17.90 -
COMETIC Oil Pump Cover Gasket C9385
COMETIC
$9.50Oil leaks at the pump cover can compromise engine cleanliness and cost you reliability on the track or street. The COMETIC Oil Pump Cover Gasket C9385 delivers a precision seal using advanced elastomer materials designed to withstand sustained high-RPM...09344688- SKU:
- 09344688
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MOUNTING POSITION:
- OUTER
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
$9.50
