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 Primary Gasket C10211
COMETIC
$33.55A primary gasket kit is the foundation of a reliable engine seal—critical for preventing oil leaks, maintaining proper combustion pressure, and avoiding costly internal damage. The Cometic C10211 uses advanced AFM material that withstands extreme heat...09345980- SKU:
- 09345980
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- EACH
$33.55 -
COMETIC Transmission Lid Gasket C10216
COMETIC
$8.95Transmission fluid leaks compromise both performance and engine longevity, and a worn gasket is often the culprit. The COMETIC C10216 transmission lid gasket eliminates seepage with a proven aluminum foamette construction that maintains integrity across...09345983- SKU:
- 09345983
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
$8.95 -
COMETIC Cylinder Head Gasket C10167-030
COMETIC
$61.90A cylinder head gasket failure can sideline your engine, but the COMETIC C10167-030 is engineered to handle extreme pressures, temperatures, and surface variations without compromise. Built with a stainless steel shim layer and dual Viton-coated outer...09345924- SKU:
- 09345924
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE:
- 4,145'
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.145'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Dip Stick O-Ring - Sportster C9961
COMETIC
$3.20Oil level monitoring depends on a reliable seal, and a degraded dip stick O-ring compromises both accuracy and engine cleanliness. COMETIC's fuel-resistant O-ring maintains its integrity under thermal cycling and chemical exposure, eliminating creep,...09340740- SKU:
- 09340740
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- DIPSTICK
- MATERIAL:
- BUNA
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
$3.20Qty in Cart: 0Quantity:Price:$3.20Subtotal: -
COMETIC Primary Gasket Kit C9886
COMETIC
$138.55A primary gasket failure can leave you stranded and cost thousands in engine damage. The COMETIC C9886 Primary Gasket Kit eliminates guesswork with precision-engineered AFM gaskets that handle extreme heat cycles while maintaining rock-solid torque...09340742- SKU:
- 09340742
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$138.55 -
COMETIC Primary Gasket Kit C9885
COMETIC
$138.55A primary gasket failure can sideline your build and cost you race time. The COMETIC C9885 Primary Gasket Kit eliminates guesswork with precision-engineered AFM gaskets that handle extreme heat cycles while maintaining consistent torque retention—no...09340743- SKU:
- 09340743
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- KIT
$138.55 -
COMETIC Rocker Gasket - .020" C9563
COMETIC
$20.10Rocker cover gaskets are critical sealing components that prevent oil weepage and contamination in your engine's valve train. A failed or deteriorating gasket compromises engine cleanliness and can lead to costly oil loss and potential bearing damage...09340748- SKU:
- 09340748
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
- THICKNESS:
- 0,51 MM (0,020')
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 5 PACK
$20.10 -
COMETIC Rocker Gasket - .020" C9561
COMETIC
$16.90Rocker cover gaskets are critical sealing components that prevent oil leakage at high RPM and under sustained boost pressure. A degraded or worn gasket compromises engine bay cleanliness and can lead to oil loss that affects engine performance and...09340749- SKU:
- 09340749
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
$16.90 -
COMETIC Rocker Gasket - Evo C9866
COMETIC
$61.30Rocker cover gaskets endure extreme temperature swings and constant pressure cycles—failure here means oil seepage, contamination, and potential engine damage. The COMETIC Rocker Gasket C9866 combines a stainless steel core with precision Viton sealing...09340751- SKU:
- 09340751
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- ROCKER COVER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
$61.30 -
COMETIC Rocker Gasket Kit - XL C9954
COMETIC
$65.05Rocker box gasket failure compromises engine sealing and invites oil leakage that can damage surrounding components. The COMETIC Rocker Gasket Kit C9954 delivers a complete sealing solution with premium materials engineered for reliability and longevity,...09340752- SKU:
- 09340752
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MODEL:
- EST
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05Qty in Cart: 0Quantity:Price:$65.05Subtotal: -
COMETIC Rocker Gasket - .020" C9986
COMETIC
$30.40Rocker cover gaskets endure extreme temperature cycling and constant pressure—a failure here means oil leaks, contamination, and potential engine damage. The COMETIC C9986 delivers reliable sealing with a proven Viton elastomer design, keeping your...09340753- SKU:
- 09340753
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- ROCKER COVER BASE
- UNITS:
- PAIR
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.51 MM
$30.40 -
COMETIC Lower Pushrod Tube Seal C9461
COMETIC
$7.40Pushrod tube seals are critical to preventing oil leakage and maintaining proper lubrication in high-performance engines—failure here can lead to catastrophic damage under racing conditions. The COMETIC C9461 Lower Pushrod Tube Seal delivers the...09350259- SKU:
- 09350259
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PUSHROD COVER
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- X-RING
- RIDING STYLE:
- STREET
- TYPE:
- QUAD SEAL
- UNITS:
- 10 PACK
$7.40 -
COMETIC Oil Pump Cover O-Ring C9684
COMETIC
$3.95Oil pump cover o-rings fail silently, leading to leaks that compromise lubrication and engine reliability. This COMETIC seal restores the critical barrier between your oil pump and engine block, preventing costly internal damage. Built with...09350260- SKU:
- 09350260
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
$3.95Qty in Cart: 0Quantity:Price:$3.95Subtotal: -
COMETIC Inner Primary Bearing Seal C9518
COMETIC
$11.60Bearing seal failure leads to oil leakage, contamination, and catastrophic internal engine damage—especially in high-rpm applications where pressure and heat push standard seals beyond their limits. The COMETIC C9518 Inner Primary Bearing Seal is...09350262- SKU:
- 09350262
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- INNER PRIMARY
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
$11.60Qty in Cart: 0Quantity:Price:$11.60Subtotal: -
COMETIC Outer Rocker O-Ring C9224
COMETIC
$32.10Proper rocker cover sealing is critical to maintaining engine integrity and preventing oil leakage that can compromise performance and create costly cleanup issues. The COMETIC Outer Rocker O-Ring C9224 delivers reliable, long-lasting sealing with...09350264- SKU:
- 09350264
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- LOWER ROCKER COVER
- PRODUCT NAME:
- SEAL
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
$32.10Qty in Cart: 0Quantity:Price:$32.10Subtotal: -
COMETIC Pushrod Tube O-Ring C9584
COMETIC
$8.95Pushrod tube O-rings are critical wear items that prevent oil leakage at the cylinder head—a common failure point in high-revving engines. Using OEM-equivalent Viton® seals ensures you're maintaining proper oil pressure and preventing costly engine...09350268- SKU:
- 09350268
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$8.95Qty in Cart: 0Quantity:Price:$8.95Subtotal: -
COMETIC Pushrod Tube Seal Set C9585
COMETIC
$8.95Pushrod tube seals are critical to maintaining oil pressure and preventing leakage in your engine's valvetrain. Over time, factory seals degrade and fail, resulting in oil weeping, reduced lubrication efficiency, and potential internal damage. The...09350269- SKU:
- 09350269
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- SET
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
$8.95 -
COMETIC Pushrod Tube O-Ring C9216
COMETIC
$8.95Pushrod tube O-ring seals are critical for maintaining a leak-free valve train and preventing oil seepage that compromises engine reliability. COMETIC's Viton® seals deliver superior chemical resistance and temperature stability, ensuring your engine...09350270- SKU:
- 09350270
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- SET
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
$8.95 -
COMETIC Main Drive Gear Metal Seal C9493
COMETIC
$8.90The COMETIC Main Drive Gear Metal Seal C9493 is engineered to eliminate leakage at the main drive gear, a critical pressure point in high-performance engines where seal failure can compromise oil pressure and overall reliability. This...09350194- SKU:
- 09350194
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
$8.90 -
COMETIC Main Drive Gear Seal Rubber C9372
COMETIC
$8.40The COMETIC Main Drive Gear Seal (C9372) is engineered to prevent oil seepage and contamination at the main drive gear—a critical junction prone to leakage under high load and sustained RPM. A failed seal compromises lubrication integrity, leading to...09350195- SKU:
- 09350195
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
$8.40
