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 Primary Gasket C10198F1
COMETIC
MSRP: $45.10Now: $40.59Was: $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...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: $40.59Was: $45.10Qty in Cart: 0Quantity:Price:MSRP: $45.10Now: $40.59Was: $45.10Subtotal: -
On Sale
COMETIC Primary Gasket C10198F5
COMETIC
Now: $108.45Was: $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...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: $108.45Was: $120.50Qty in Cart: 0Quantity:Price:Now: $108.45Was: $120.50Subtotal: -
On Sale
COMETIC Top End Gasket Kit - Twin Cooled - .040" C10138
COMETIC
MSRP: $183.70Now: $165.33Was: $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...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: $165.33Was: $183.70Qty in Cart: 0Quantity:Price:MSRP: $183.70Now: $165.33Was: $183.70Subtotal: -
On Sale
COMETIC Coolant Tube O-Ring Set C10139
COMETIC
MSRP: $31.45Now: $28.31Was: $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...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: $28.31Was: $31.45Qty in Cart: 0Quantity:Price:MSRP: $31.45Now: $28.31Was: $31.45Subtotal: -
On Sale
COMETIC Top End Gasket Kit - Twin Cam C9949
COMETIC
MSRP: $153.25Now: $137.93Was: $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)...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: $137.93Was: $153.25 -
On Sale
COMETIC Cam Cover Gasket C10146F1
COMETIC
MSRP: $17.80Now: $16.02Was: $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...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'
MSRP: $17.80Now: $16.02Was: $17.80Qty in Cart: 0Quantity:Price:MSRP: $17.80Now: $16.02Was: $17.80Subtotal: -
On Sale
COMETIC Cam Cover Gasket C10146F5
COMETIC
MSRP: $82.90Now: $74.61Was: $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...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
MSRP: $82.90Now: $74.61Was: $82.90 -
On Sale
COMETIC Rocker Box Gasket Kit C10150
COMETIC
MSRP: $65.05Now: $58.55Was: $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...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
MSRP: $65.05Now: $58.55Was: $65.05 -
On Sale
COMETIC Head Gasket C10070
COMETIC
MSRP: $61.90Now: $55.71Was: $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,...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
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Engine Gasket Kit - XL C9045F
COMETIC
MSRP: $183.70Now: $165.33Was: $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...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
MSRP: $183.70Now: $165.33Was: $183.70 -
On Sale
COMETIC Engine Gasket Kit - XL C9047F
COMETIC
MSRP: $158.50Now: $142.65Was: $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...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
MSRP: $158.50Now: $142.65Was: $158.50Qty in Cart: 0Quantity:Price:MSRP: $158.50Now: $142.65Was: $158.50Subtotal: -
On Sale
COMETIC Top End Gasket Kit - XL C9052
COMETIC
MSRP: $75.55Now: $68.00Was: $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...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
MSRP: $75.55Now: $68.00Was: $75.55Qty in Cart: 0Quantity:Price:MSRP: $75.55Now: $68.00Was: $75.55Subtotal: -
On Sale
COMETIC Top End Gasket Kit - XL C9102
COMETIC
MSRP: $75.55Now: $68.00Was: $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...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'
MSRP: $75.55Now: $68.00Was: $75.55 -
On Sale
COMETIC Top End Gasket Kit - XL C9103
COMETIC
MSRP: $75.55Now: $68.00Was: $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...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'
MSRP: $75.55Now: $68.00Was: $75.55 -
On Sale
COMETIC Top End Gasket Kit - XL C9104
COMETIC
MSRP: $75.55Now: $68.00Was: $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...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'
MSRP: $75.55Now: $68.00Was: $75.55 -
On Sale
COMETIC Top End Gasket Kit - XL C9116
COMETIC
MSRP: $75.55Now: $68.00Was: $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...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
MSRP: $75.55Now: $68.00Was: $75.55Qty in Cart: 0Quantity:Price:MSRP: $75.55Now: $68.00Was: $75.55Subtotal: -
On Sale
COMETIC Engine Gasket Kit - XL C9117F
COMETIC
MSRP: $164.80Now: $148.32Was: $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...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
MSRP: $164.80Now: $148.32Was: $164.80Qty in Cart: 0Quantity:Price:MSRP: $164.80Now: $148.32Was: $164.80Subtotal: -
On Sale
COMETIC Head Gasket C9137
COMETIC
MSRP: $61.90Now: $55.71Was: $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...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'
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Engine Gasket Kit - Big Twin C9154
COMETIC
MSRP: $246.70Now: $222.03Was: $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...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
MSRP: $246.70Now: $222.03Was: $246.70 -
On Sale
COMETIC Cylinder Base Gasket C9206
COMETIC
MSRP: $33.55Now: $30.20Was: $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...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
MSRP: $33.55Now: $30.20Was: $33.55
