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 Trans Gasket - 5 Speed C9467
COMETIC
MSRP: $102.85Now: $92.57Was: $102.85Transmission gasket failure creates catastrophic fluid loss and drivetrain damage—often at the worst possible moment. The COMETIC Trans Gasket C9467 eliminates guesswork with application-specific...09340822- SKU:
- 09340822
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- STYLE:
- 5-SPEED
- UNITS:
- KIT
MSRP: $102.85Now: $92.57Was: $102.85 -
On Sale
COMETIC Trans Gasket - FXD C9468
COMETIC
MSRP: $56.65Now: $50.99Was: $56.65A transmission gasket kit is critical for maintaining pressure integrity and preventing costly fluid leaks that compromise performance and engine longevity. The COMETIC Trans Gasket C9468 delivers...09340823- SKU:
- 09340823
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- STYLE:
- 5-SPEED
MSRP: $56.65Now: $50.99Was: $56.65Qty in Cart: 0Quantity:Price:MSRP: $56.65Now: $50.99Was: $56.65Subtotal: -
On Sale
COMETIC Trans Gasket - FXD C9640
COMETIC
MSRP: $47.20Now: $42.48Was: $47.20Transmission gasket failure can compromise your entire drivetrain, leading to fluid leaks, contamination, and costly downtime. The COMETIC Trans Gasket C9640 is engineered with application-specific...09340825- SKU:
- 09340825
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $47.20Now: $42.48Was: $47.20 -
On Sale
COMETIC Base Gasket - Evo - 4" - .010" C9871
COMETIC
MSRP: $33.55Now: $30.20Was: $33.55A quality head gasket is the foundation of a reliable, high-power engine build. The COMETIC Base Gasket for Evo applications delivers consistent sealing across demanding boost levels and repeated...09340005- SKU:
- 09340005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- RUBBER
- TYPE:
- CYLINDER BASE
- BORE SIZE IMPERIAL:
- 4.000'
- STYLE:
- STANDARD
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
MSRP: $33.55Now: $30.20Was: $33.55 -
On Sale
COMETIC Head Gasket - 4"- .030" C9878
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket is your engine's critical seal—it prevents combustion pressure and coolant from leaking into the block while maintaining precise compression. The COMETIC C9878 MLS design distributes...09340008- SKU:
- 09340008
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- UNITS:
- PAIR
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Head Gasket - 4"- .036" C9879
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A quality head gasket is the foundation of reliable combustion sealing—without it, you're risking coolant leaks, oil contamination, and catastrophic engine failure. The COMETIC C9879 uses advanced...09340009- SKU:
- 09340009
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
- BORE SIZE:
- 4,000'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,91 MM (0,036')
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.000'
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Cylinder Head Gasket C10167-045
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A reliable cylinder head gasket is the foundation of a sealed, efficient combustion chamber—without it, you're looking at coolant leaks, oil weeping, and lost compression. The COMETIC C10167-045 uses...09345926- SKU:
- 09345926
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE:
- 4,145'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- BORE SIZE IMPERIAL:
- 4.145'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Cylinder Head Gasket C10168
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A compromised cylinder head gasket will kill performance and reliability faster than worn rings. The COMETIC C10168 delivers the sealing integrity your engine demands, whether you're running...09345928- SKU:
- 09345928
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.205'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,205'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Cylinder Head Gasket C10168-030
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A failed cylinder head gasket compromises compression, causes coolant leaks, and can result in catastrophic engine damage if left unchecked. The COMETIC C10168-030 delivers multi-layer construction...09345929- SKU:
- 09345929
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.205'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,205'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Cylinder Head Gasket C10169-030
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A proper cylinder head gasket is non-negotiable for maintaining compression, preventing coolant crossover, and protecting against oil leakage across multiple heat cycles. The COMETIC C10169-030...09345932- SKU:
- 09345932
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE IMPERIAL:
- 4.220'
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,220'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Airbox/Throttle Body Gasket C10176
COMETIC
MSRP: $5.95Now: $5.36Was: $5.95A reliable airbox-to-throttle body seal is critical to maintaining proper fuel mixture and preventing vacuum leaks that degrade performance and fuel economy. The COMETIC C10176 eliminates the...09345936- SKU:
- 09345936
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS:
- 0,79 MM (0,031')
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- THROTTLE BODY
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- AIRBOX
- UNITS:
- EACH
MSRP: $5.95Now: $5.36Was: $5.95 -
On Sale
COMETIC Cylinder Head Gasket/Base C10191-HB
COMETIC
MSRP: $81.85Now: $73.67Was: $81.85A compromised head gasket kills performance and reliability—and COMETIC's Multi-Layer Steel design ensures a leak-free seal that withstands high combustion pressures, boost cycles, and extended track...09345952- SKU:
- 09345952
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE:
- 4,250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,36 MM (0,014')
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
MSRP: $81.85Now: $73.67Was: $81.85Qty in Cart: 0Quantity:Price:MSRP: $81.85Now: $73.67Was: $81.85Subtotal: -
On Sale
COMETIC Cylinder Head/Base Gasket C10192-HB
COMETIC
MSRP: $81.85Now: $73.67Was: $81.85A reliable cylinder head gasket is fundamental to maintaining combustion chamber seal integrity and preventing coolant or oil seepage that compromises engine performance. The COMETIC C10192-HB...09345954- SKU:
- 09345954
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- BORE SIZE:
- 4,320'
- BORE SIZE IMPERIAL:
- 4.320'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,36 MM (0,014')
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
MSRP: $81.85Now: $73.67Was: $81.85Qty in Cart: 0Quantity:Price:MSRP: $81.85Now: $73.67Was: $81.85Subtotal: -
On Sale
COMETIC Trans End Gasket C9483F
COMETIC
Now: $17.91Was: $19.90A leaking transmission end gasket compromises both performance and reliability, leading to fluid loss and potential internal damage. The COMETIC Trans End Gasket C9483F delivers a superior seal...09341385- SKU:
- 09341385
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CLUTCH RELEASE
- TYPE:
- END COVER
Now: $17.91Was: $19.90Qty in Cart: 0Quantity:Price:Now: $17.91Was: $19.90Subtotal: -
On Sale
COMETIC Oil Gasket C9489F
COMETIC
Now: $8.55Was: $9.50Oil leaks compromise both engine performance and your shop floor—the COMETIC C9489F eliminates this problem with a robust aluminum-core gasket that won't degrade under sustained heat and pressure...09341386- SKU:
- 09341386
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- OIL FILLER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
Now: $8.55Was: $9.50 -
COMETIC Bearing Housing Gasket C9644F
COMETIC
$20.60Bearing housing gaskets are critical sealing components that prevent oil leakage and maintain pressure integrity in high-performance engines. The COMETIC C9644F uses Aluminum Foamette construction to...09341390- SKU:
- 09341390
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION
- TYPE:
- BEARING HOUSING
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
$20.60Qty in Cart: 0Quantity:Price:$20.60Subtotal: -
COMETIC Inner Rocker Gasket C9197
COMETIC
$5.20Inner rocker gaskets are critical sealing components that prevent oil leakage at the rocker cover interface—a common failure point in high-revving engines. The COMETIC C9197 combines a stainless...09341396- SKU:
- 09341396
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MOUNTING POSITION:
- INNER
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
$5.20Qty in Cart: 0Quantity:Price:$5.20Subtotal: -
COMETIC Lower Rocker Cover Rubber Gasket C9014
COMETIC
$26.90A quality rocker cover gasket is critical to preventing oil leaks that can compromise engine cleanliness and performance. The COMETIC C9014 combines proven Viton elastomer technology with a stainless...09341399- SKU:
- 09341399
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- LOWER
- MATERIAL:
- VITON
- TYPE:
- ROCKER COVER
$26.90Qty in Cart: 0Quantity:Price:$26.90Subtotal: -
COMETIC Upper Rocker Cover Rubber Gasket C9010
COMETIC
$26.90A leaking rocker cover gasket compromises engine sealing and invites oil contamination into your combustion chamber. The COMETIC Upper Rocker Cover Rubber Gasket C9010 delivers reliable, long-term...09341400- SKU:
- 09341400
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- MOUNTING POSITION:
- UPPER
- TYPE:
- ROCKER COVER
$26.90Qty in Cart: 0Quantity:Price:$26.90Subtotal: -
COMETIC Rocker Cover Rubber Gasket C9276
COMETIC
$20.10A quality rocker cover gasket is critical to preventing oil seepage that can compromise engine cleanliness and performance. The COMETIC C9276 combines a stainless steel core with a precision Viton...09341401- SKU:
- 09341401
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- VITON
- MOUNTING POSITION:
- UPPER
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
$20.10
