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
-
On Sale
COMETIC Oil Pan Gasket Kit - M8 - FLHT C10197
COMETIC
MSRP: $102.85Now: $97.00Was: $102.85An oil pan gasket failure can turn a routine ride into a costly repair. The COMETIC Oil Pan Gasket Kit eliminates leaks at the source with precision-engineered sealing surfaces designed specifically for M8 Harley-Davidson engines. This is the gasket set...09345960- SKU:
- 09345960
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- OIL PAN
- UNITS:
- KIT
MSRP: $102.85Now: $97.00Was: $102.85Qty in Cart: 0Quantity:Price:MSRP: $102.85Now: $97.00Was: $102.85Subtotal: -
On Sale
COMETIC Primary Gasket C10198F1
COMETIC
MSRP: $45.10Now: $42.00Was: $45.10A properly sealed primary gasket is non-negotiable for reliable engine operation and consistent performance. Cometic's AFM gaskets deliver the durability and heat resistance required for high-output engines, eliminating leaks that compromise power and...09345961- SKU:
- 09345961
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- EACH
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY COVER
MSRP: $45.10Now: $42.00Was: $45.10 -
On Sale
COMETIC Primary Gasket C10198F5
COMETIC
Now: $113.00Was: $120.50Primary gasket failures can leave you stranded on the track or roadside—and cheap gaskets won't survive the heat cycles your engine generates. The COMETIC C10198F5 uses aerospace-grade AFM (Aluminum Foamette Material) construction to handle extreme...09345962- SKU:
- 09345962
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- UNITS:
- 5 PACK
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
Now: $113.00Was: $120.50 -
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 Coolant Tube O-Ring Set C10139
COMETIC
MSRP: $31.45Now: $30.00Was: $31.45Proper O-ring seals are critical to preventing coolant leaks and maintaining system integrity during cylinder head service. The COMETIC C10139 O-ring set eliminates guesswork by providing all necessary seals and washers in one package, ensuring a...09344838- SKU:
- 09344838
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- KIT
- APPLICATION:
- COOLANT TUBE
- RIDING STYLE:
- STREET
MSRP: $31.45Now: $30.00Was: $31.45Qty in Cart: 0Quantity:Price:MSRP: $31.45Now: $30.00Was: $31.45Subtotal: -
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 Rocker Box Gasket Kit C10150
COMETIC
$65.05Rocker box gasket failures compromise oil sealing and can lead to messy leaks and accelerated wear on critical valve train components. The COMETIC C10150 kit eliminates guesswork by bundling every gasket, seal, and O-ring needed for a complete,...09345068- SKU:
- 09345068
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MODEL:
- EST
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- STEEL
- TYPE:
- ROCKER BOX
$65.05Qty in Cart: 0Quantity:Price:$65.05Subtotal: -
COMETIC Head Gasket C10070
COMETIC
$61.90A head gasket failure can sideline your engine and drain your wallet—the COMETIC C10070 eliminates that risk with a multi-layer steel design engineered to handle extreme combustion pressures, temperature swings, and aggressive sealing demands. The Load...09344653- SKU:
- 09344653
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 3,625'
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Engine Gasket Kit - XL C9045F
COMETIC
$183.70A complete gasket kit is your foundation for a reliable, leak-free engine—especially critical if you're rebuilding or running high boost pressures. COMETIC's XL C9045F uses purpose-built materials for each application, eliminating the guesswork of...09344654- SKU:
- 09344654
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE SIZE IMPERIAL:
- 3.250'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,250'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$183.70 -
COMETIC Engine Gasket Kit - XL C9047F
COMETIC
$158.50Engine gasket failure compromises compression, invites oil leakage, and can force a complete rebuild. COMETIC's XL C9047F kit delivers comprehensive sealing with proven materials engineered for both street and race applications, eliminating the guesswork...09344655- SKU:
- 09344655
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE:
- 3,365'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- BORE SIZE IMPERIAL:
- 3.365'
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$158.50Qty in Cart: 0Quantity:Price:$158.50Subtotal: -
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 C9102
COMETIC
$75.55A top-end gasket failure can sideline your engine and derail race day—or worse, cost you thousands in head damage. The COMETIC C9102 kit eliminates guesswork with engineered sealing technology designed to handle extreme combustion pressures and...09344657- SKU:
- 09344657
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,031'
- THICKNESS METRIC:
- 0.81 MM
- BORE SIZE IMPERIAL:
- 3.000'
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- TOP END
- BORE SIZE:
- 3,000'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- MODEL:
- EST
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- THICKNESS IMPERIAL:
- 0,032'
$75.55Qty in Cart: 0Quantity:Price:$75.55Subtotal: -
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 Top End Gasket Kit - XL C9116
COMETIC
$75.55Gasket failure under high heat is one of the most common culprits behind engine rebuilds and costly downtime. The COMETIC Top End Gasket Kit eliminates hot spots that lead to premature failure by distributing combustion heat evenly across the gasket...09344660- SKU:
- 09344660
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- UNITS:
- KIT
- MODEL:
- EST
- THICKNESS IMPERIAL:
- 0.031'
- THICKNESS IMPERIAL:
- 0.063'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- STYLE:
- LOW COMPRESSION
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
$75.55Qty in Cart: 0Quantity:Price:$75.55Subtotal: -
COMETIC Engine Gasket Kit - XL C9117F
COMETIC
$164.80A complete gasket failure can sideline your engine and derail race season. The COMETIC Engine Gasket Kit C9117F eliminates guesswork by providing premium sealing solutions engineered for high-performance applications—every gasket selected for its...09344661- SKU:
- 09344661
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE SIZE IMPERIAL:
- 3.425'
- UNITS:
- KIT
- BORE SIZE:
- 3,425'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
$164.80Qty in Cart: 0Quantity:Price:$164.80Subtotal: -
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
