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 Base Gasket - 3-5/8" C9989
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55A failing head gasket compromises combustion sealing, kills power output, and invites coolant leaks that can wreck your engine. The COMETIC Base Gasket C9989 uses multi-layer steel construction with load-control embossments to distribute clamping force...09340784- SKU:
- 09340784
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- RUBBER
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- MATERIAL:
- STEEL
- STYLE:
- STANDARD
- THICKNESS:
- STOCK
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Cam Cover Gasket - XL C9944F5
COMETIC
Now: $24.00Was: $25.60A failing cam cover gasket is one of the most common sources of oil seepage in high-performance engines, robbing you of reliability and creating messy engine bays. The COMETIC Cam Cover Gasket XL C9944F5 delivers OEM-equivalent sealing with superior...09340785- SKU:
- 09340785
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CAM COVER
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
Now: $24.00Was: $25.60 -
On Sale
COMETIC Cam Gasket Kit C9664
COMETIC
MSRP: $73.45Now: $69.00Was: $73.45A cam change demands precision—and a single missed gasket or seal can compromise your engine's integrity and cost you race time or track days. The COMETIC Cam Gasket Kit C9664 bundles every gasket, seal, O-ring, and cork washer you need in one purchase,...09340786- SKU:
- 09340786
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $73.45Now: $69.00Was: $73.45 -
On Sale
COMETIC Head Gasket - 4.125 - .040" C9743
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A quality head gasket is critical to maintaining proper combustion chamber sealing under extreme pressure and temperature—failure here cascades into lost compression, coolant leaks, and catastrophic engine damage. The COMETIC C9743 uses multi-layer steel...09340790- SKU:
- 09340790
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Primary Gasket C9607F5
COMETIC
Now: $113.00Was: $120.50A primary gasket is a critical sealing component in your engine's transmission or primary drive system—failure here means oil leaks, contamination, and potential drivetrain damage. The COMETIC C9607F5 is engineered to provide reliable, long-lasting...20111489- SKU:
- 20111489
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
Now: $113.00Was: $120.50 -
On Sale
COMETIC Primary Gasket C9308F5
COMETIC
Now: $113.00Was: $120.50A primary gasket is critical to maintaining a sealed, leak-free crankcase—essential for preserving oil pressure and preventing contamination that can compromise engine reliability. The COMETIC Primary Gasket C9308F5 delivers OEM-level sealing performance...20111490- SKU:
- 20111490
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
Now: $113.00Was: $120.50 -
On Sale
COMETIC Primary Gasket C9310F5
COMETIC
Now: $78.00Was: $83.50A primary gasket failure can compromise your entire engine's sealing integrity, leading to oil leaks, contamination, and potential catastrophic damage. The COMETIC C9310F5 Primary Gasket delivers reliable, long-lasting sealing for demanding racing and...20111491- SKU:
- 20111491
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
Now: $78.00Was: $83.50 -
On Sale
COMETIC Primary Gasket C9314F5
COMETIC
Now: $78.00Was: $83.50A primary gasket failure can leave you stranded and cost you race time—or worse, damage your engine. The COMETIC C9314F5 uses proprietary AFM (Aluminum Foamette Material) construction to deliver exceptional sealing integrity on machined surfaces without...20111492- SKU:
- 20111492
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
Now: $78.00Was: $83.50 -
On Sale
COMETIC Inspection Cover Gasket - FL C9303F5
COMETIC
Now: $24.00Was: $25.60A quality inspection cover gasket is critical for maintaining proper engine sealing and preventing oil seepage around your inspection cover. COMETIC's FL C9303F5 delivers reliable, long-lasting performance with precision engineering and American...20111493- SKU:
- 20111493
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
Now: $24.00Was: $25.60 -
On Sale
COMETIC Derby Gasket - AFM C9338F5
COMETIC
Now: $28.00Was: $30.20A leaking derby cover gasket compromises engine sealing and invites contamination into your top-end components. The COMETIC C9338F5 delivers reliable, leak-free performance with precision engineering that meets OEM standards for fitment and durability...20111496- SKU:
- 20111496
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
Now: $28.00Was: $30.20 -
On Sale
COMETIC Injector O-Ring C10205
COMETIC
Now: $8.00Was: $9.00Fuel injector o-rings are critical sealing components that prevent leaks at injector bungs, which can compromise fuel pressure, cause rough idle, and lead to costly engine damage. A degraded or worn o-ring will allow fuel to escape into the intake...09350994- SKU:
- 09350994
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- APPLICATION:
- FUEL INJECTOR
- UNITS:
- 10 PACK
Now: $8.00Was: $9.00 -
On Sale
COMETIC Injector O-Ring C10206
COMETIC
Now: $8.00Was: $9.00Injector o-rings are critical sealing components that prevent fuel and coolant leaks at the injector body interface. A compromised o-ring can lead to fuel seepage, rough idle, and potential engine damage. The COMETIC Injector O-Ring C10206 delivers...09350995- SKU:
- 09350995
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- APPLICATION:
- FUEL INJECTOR
Now: $8.00Was: $9.00 -
On Sale
COMETIC Air Cleaner Seal C10207
COMETIC
Now: $16.00Was: $17.10A properly sealed air cleaner isn't just about filtration—it's about preventing unmetered air from bypassing your filter and contaminating your fuel mixture with abrasive particles. The COMETIC Air Cleaner Seal C10207 delivers the precision fit and...09350996- SKU:
- 09350996
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- AIR CLEANER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
Now: $16.00Was: $17.10 -
On Sale
COMETIC Seal C10209
COMETIC
Now: $15.00Was: $15.80Seal failures compromise engine integrity and can lead to costly leaks and performance degradation. The COMETIC Seal C10209 eliminates that risk with fuel-resistant construction designed to maintain a perfect seal under extreme operating conditions...09350998- SKU:
- 09350998
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- APPLICATION:
- CRANKCASE
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- PRODUCT NAME:
- SEAL
Now: $15.00Was: $15.80 -
On Sale
COMETIC O-Ring C10212
COMETIC
Now: $6.00Was: $6.80Proper sealing is non-negotiable in high-performance applications where pressure spikes and thermal cycling demand absolute reliability. The Cometic O-Ring C10212 delivers consistent, leak-free sealing across critical engine and drivetrain components...09351000- SKU:
- 09351000
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- O-RING
- APPLICATION:
- OIL LINE
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
Now: $6.00Was: $6.80 -
On Sale
COMETIC Head Gasket - .045" C9985-045
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket is your engine's critical seal—it's the barrier between combustion pressure and coolant passages. If it fails, you're looking at catastrophic damage. The COMETIC C9985-045 uses proven MLS (Multi-Layer Steel) construction with Load Control...09350398- SKU:
- 09350398
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- BORE SIZE:
- 3,625'
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- STEEL
- THICKNESS:
- 0,045'
- THICKNESS IMPERIAL:
- 0.045'
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $58.00Was: $61.90 -
COMETIC Clutch Release Gear Seal C9364-1
COMETIC
$4.00The clutch release seal is a critical barrier against fluid contamination and leakage in your clutch hydraulic system. A worn or deteriorating seal compromises pressure consistency and can lead to engagement issues, slipping, and costly internal damage...09350827- SKU:
- 09350827
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- APPLICATION:
- RELEASE ROD
- MATERIAL:
- VITON
$4.00Qty in Cart: 0Quantity:Price:$4.00Subtotal: -
COMETIC Sprocket Shaft Seal C9366-1
COMETIC
$6.00Sprocket shaft seals are critical to preventing fluid leakage and contamination in high-performance engines where precision and reliability are non-negotiable. The COMETIC C9366-1 delivers the durability required for sustained racing applications without...09350829- SKU:
- 09350829
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- SPROCKET SHAFT
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$6.00 -
On Sale
COMETIC Pushrod Cover Seals C9369
COMETIC
Now: $11.00Was: $11.60Pushrod cover leaks are a common source of oil seepage that compounds over time, potentially contaminating spark plug wells and compromising ignition reliability. The COMETIC C9369 Pushrod Cover Seals are precision-engineered replacements that restore a...09350832- SKU:
- 09350832
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PUSHROD COVER
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
Now: $11.00Was: $11.60Qty in Cart: 0Quantity:Price:Now: $11.00Was: $11.60Subtotal: -
COMETIC Shifter Lever Shaft Seal C9370-1
COMETIC
$5.00Shifter lever shaft seals endure extreme heat cycles and fluid exposure in high-performance transmissions—component failure here means slippage, leakage, and potential drivetrain damage. The COMETIC C9370-1 is engineered with fuel-resistant elastomer...09350833- SKU:
- 09350833
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- MATERIAL:
- VITON
- APPLICATION:
- SHIFTER SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$5.00
