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 Mainshaft Quad Seal C9361
COMETIC
Now: $10.00Was: $10.60Mainshaft seals are critical to preventing internal transmission fluid leakage and maintaining hydraulic pressure—especially under high-performance driving conditions where vibration and heat accelerate seal degradation. The COMETIC Mainshaft Quad Seal...09350189- SKU:
- 09350189
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- APPLICATION:
- TRANSMISSION
Now: $10.00Was: $10.60 -
On Sale
COMETIC Filler Plug O-Ring C9263
COMETIC
MSRP: $4.15Now: $4.00Was: $4.20A leaking filler plug can compromise your entire cooling system's integrity and lead to catastrophic engine damage. The COMETIC Filler Plug O-Ring C9263 delivers a reliable, OEM-quality seal that prevents coolant loss and maintains system pressure where...09350191- SKU:
- 09350191
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- FILLER PLUG
MSRP: $4.15Now: $4.00Was: $4.20 -
On Sale
COMETIC Clutch Cable O-Ring C9447
COMETIC
Now: $3.00Was: $3.20A worn or degraded clutch cable O-ring compromises shift precision and can lead to cable binding or premature failure—especially under sustained track conditions. The COMETIC C9447 replaces that critical seal with a precision-engineered O-ring...09350192- SKU:
- 09350192
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- APPLICATION:
- CLUTCH CABLE
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
Now: $3.00Was: $3.20 -
On Sale
COMETIC Head Gasket - .03" - Evo - 3.5" C9688
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A failed head gasket can mean catastrophic engine damage and costly downtime—especially on a high-compression Evo platform. The COMETIC C9688 uses multi-layer steel construction with load control embossments to distribute clamping force evenly across the...DS172086- SKU:
- DS172086
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,76 MM (0,030')
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .03"- Evo - 3.625" C9690
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket is your engine's critical seal—any compromise in material or design directly impacts compression, power output, and longevity. The COMETIC C9690 uses multi-layer steel construction with load control embossments to distribute clamping force...DS172088- SKU:
- DS172088
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- BORE SIZE IMPERIAL:
- 3.670'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- BORE SIZE:
- 3,670'
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .030" - 95" - Twin Cam C9721
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A properly sealed combustion chamber is non-negotiable for engine reliability and power output—especially in high-performance Twin Cam applications where heat cycling and boost pressure demand precision. The COMETIC C9721 head gasket uses multi-layer...DS172104- SKU:
- DS172104
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE:
- 3,875'
- PRODUCT NAME:
- GASKET
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE IMPERIAL:
- 3.875'
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .030" - 88" - Twin Cam C9790
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A quality head gasket is fundamental to engine reliability and performance—it's the barrier between combustion pressure and coolant passages, so compromise here means potential catastrophic failure. The COMETIC C9790 uses multi-layer steel construction...DS172106- SKU:
- DS172106
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,750'
- THICKNESS:
- 0,76 MM (0,030')
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Primary Gasket C9307F5
COMETIC
Now: $113.00Was: $120.50A primary gasket failure can compromise your entire engine seal system, leading to oil weeping, air leaks, and potential catastrophic damage during high-RPM operation. The COMETIC C9307F5 delivers the reliability and durability that professional racers...20111487- SKU:
- 20111487
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MOUNTING POSITION:
- OUTER
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
Now: $113.00Was: $120.50 -
On Sale
COMETIC Tappet Screw O-Ring C9448
COMETIC
MSRP: $4.15Now: $4.00Was: $4.20Valve cover gasket leaks are a common culprit behind oil seepage and engine bay mess. The COMETIC Tappet Screw O-Ring (C9448) provides a precision seal at the critical junction where fasteners pass through your gasket, eliminating the small leaks that...09350225- SKU:
- 09350225
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- TAPPET GUIDE
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
MSRP: $4.15Now: $4.00Was: $4.20Qty in Cart: 0Quantity:Price:MSRP: $4.15Now: $4.00Was: $4.20Subtotal: -
On Sale
COMETIC Upper Tappet Block O-Ring C9443
COMETIC
Now: $8.00Was: $8.40The upper tappet block o-ring is a critical seal in your engine's valve train system—when it fails, oil leakage and compromised cylinder head pressure follow immediately. Cometic's C9443 is engineered from premium fuel-resistant elastomers that maintain...09350226- SKU:
- 09350226
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- VITON
- APPLICATION:
- UPPER TAPPET BLOCK
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
Now: $8.00Was: $8.40 -
On Sale
COMETIC Lower Pushrod O-Ring C9295
COMETIC
Now: $13.00Was: $14.10Pushrod sealing integrity is critical to maintaining proper oil pressure and preventing catastrophic engine leakage. The COMETIC Lower Pushrod O-Ring C9295 delivers the precision engineering and material science your engine demands, whether you're...09350228- SKU:
- 09350228
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- NITRILE RUBBER
- UNITS:
- 10 PACK
- APPLICATION:
- PUSHROD COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
Now: $13.00Was: $14.10Qty in Cart: 0Quantity:Price:Now: $13.00Was: $14.10Subtotal: -
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 Point Cover Seal C9355
COMETIC
Now: $8.00Was: $8.20A failing point cover seal leads to oil leaks, contamination of ignition components, and potential engine damage—problems that compound quickly on the track or in the shop. The COMETIC C9355 eliminates these risks with a precision-engineered seal that...09350230- SKU:
- 09350230
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- APPLICATION:
- CAM COVER
- PRODUCT NAME:
- SEAL
Now: $8.00Was: $8.20Qty in Cart: 0Quantity:Price:Now: $8.00Was: $8.20Subtotal: -
On Sale
COMETIC Inspection Cover O-Ring C9439
COMETIC
Now: $6.00Was: $6.40Inspection cover o-rings are critical sealing components that prevent oil leakage and contamination in high-performance engines. The COMETIC C9439 is engineered with fuel-resistant materials that maintain their integrity under extreme temperatures and...09350232- SKU:
- 09350232
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CHAIN INSPECTION COVER
- UNITS:
- 10 PACK
- MATERIAL:
- NITRILE RUBBER
Now: $6.00Was: $6.40Qty in Cart: 0Quantity:Price:Now: $6.00Was: $6.40Subtotal: -
On Sale
COMETIC Motor Sprocket Seal C9353
COMETIC
Now: $16.00Was: $17.20A failing sprocket seal allows oil to migrate past your crankshaft, leading to contamination, reduced bearing protection, and potential catastrophic engine failure. The COMETIC Motor Sprocket Seal C9353 is a precision-engineered replacement that restores...09350234- SKU:
- 09350234
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- 5 PACK
Now: $16.00Was: $17.20Qty in Cart: 0Quantity:Price:Now: $16.00Was: $17.20Subtotal: -
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 Aluminum Inner Spacer Gasket C9199F5
COMETIC
Now: $100.00Was: $106.00A quality inner spacer gasket is critical to maintaining proper cylinder head sealing and preventing coolant or oil leakage in high-performance applications. The COMETIC Aluminum Inner Spacer Gasket C9199F5 delivers reliable, leak-free performance with...09350241- SKU:
- 09350241
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- PRIMARY SPACER
- MATERIAL:
- SILICONE
- MOUNTING POSITION:
- INNER
- UNITS:
- 5 PACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
Now: $100.00Was: $106.00 -
On Sale
COMETIC Cam Gasket Kit - M8 C10178-FP
COMETIC
MSRP: $60.85Now: $57.00Was: $60.85A cam change demands precision—using OEM-spec gaskets and seals ensures zero leakage and reliable valve timing. This complete kit eliminates the guesswork of sourcing individual components, saving you time on the bench and protecting your engine...09346316- SKU:
- 09346316
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- FEATURES:
- WITH ROCKER COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
MSRP: $60.85Now: $57.00Was: $60.85 -
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 Primary Seal Gasket Kit C10196
COMETIC
MSRP: $87.10Now: $82.00Was: $87.10Primary seal degradation is one of the fastest ways to lose oil containment and compromise engine reliability. The COMETIC C10196 Primary Seal Gasket Kit eliminates guesswork with a complete solution engineered for both stock and modified engines,...09345959- SKU:
- 09345959
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- TYPE:
- PRIMARY
- TYPE:
- STARTER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
MSRP: $87.10Now: $82.00Was: $87.10
