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 C10242
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09346319- SKU:
- 09346319
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Intake/Manifold Gasket - M8 C10247
COMETIC
MSRP: $41.95Now: $39.00Was: $41.95Gaskets and gasket sets used by professionals in high-performance machines and as OE replacements worldwide, Intake gasket kits are made using either a .020” thick aramid fiber material or an AFM material that is comprised of a compounded nitrile...09346317- SKU:
- 09346317
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
MSRP: $41.95Now: $39.00Was: $41.95 -
On Sale
COMETIC Lower Rocker Box Gaskets C10183
COMETIC
MSRP: $27.25Now: $26.00Was: $27.25Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.09345950- SKU:
- 09345950
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- UNITS:
- 2 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- MATERIAL:
- RUBBER
- MOUNTING POSITION:
- LOWER
MSRP: $27.25Now: $26.00Was: $27.25 -
On Sale
COMETIC Cylinder Head Gasket C10182
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345948- SKU:
- 09345948
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE SIZE:
- 4,320'
- BORE SIZE IMPERIAL:
- 4.320'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- LAYERED STEEL
- UNITS:
- 2 PACK
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- THICKNESS METRIC:
- 1.02 MM
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Cylinder Head/Base Gasket C10181HB030020
COMETIC
MSRP: $78.70Now: $74.00Was: $78.70Kits feature Multi-Layer Steel (MLS) gaskets; feature two outer Viton®-coated embossed spring steel layers with an inner steel layer to provide additional support, Made in the U.S.A.09345947- SKU:
- 09345947
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- THICKNESS:
- 0,76 MM (0,030')
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.51 MM
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
MSRP: $78.70Now: $74.00Was: $78.70 -
On Sale
COMETIC Cylinder Head/Base Gasket C10181HB030014
COMETIC
MSRP: $78.70Now: $74.00Was: $78.70Kits feature Multi-Layer Steel (MLS) gaskets; feature two outer Viton®-coated embossed spring steel layers with an inner steel layer to provide additional support, Made in the U.S.A.09345946- SKU:
- 09345946
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE SIZE:
- 4,250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,36 MM (0,014')
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
MSRP: $78.70Now: $74.00Was: $78.70 -
On Sale
COMETIC Cylinder Head Gasket C10181-030
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345944- SKU:
- 09345944
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- THICKNESS IMPERIAL:
- 0,030'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Cylinder Head Gasket C10181
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345943- SKU:
- 09345943
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 1.02 MM
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Cam Change Gasket Kit C10178
COMETIC
MSRP: $39.85Now: $37.00Was: $39.85Components made from premium materials for long life and correct fitment, Includes all necessary gaskets, seals, O-rings and cork washers to do a cam change, Made in the U.S.A.09345940- SKU:
- 09345940
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- FEATURES:
- WITHOUT ROCKER COVER
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $39.85Now: $37.00Was: $39.85 -
On Sale
COMETIC Cylinder Base Gasket Pair C10177-010
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345938- SKU:
- 09345938
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- UNITS:
- 2 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- CYLINDER BASE
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Cylinder Head/Base Gasket Pair C10166-HB-030
COMETIC
MSRP: $81.85Now: $77.00Was: $81.85Kits feature Multi-Layer Steel (MLS) gaskets; feature two outer Viton®-coated embossed spring steel layers with an inner steel layer to provide additional support, Made in the U.S.A.09345922- SKU:
- 09345922
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- MATERIAL:
- LAYERED STEEL
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,095'
- BORE SIZE IMPERIAL:
- 4.095'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
MSRP: $81.85Now: $77.00Was: $81.85Qty in Cart: 0Quantity:Price:MSRP: $81.85Now: $77.00Was: $81.85Subtotal: -
On Sale
COMETIC Cylinder Head Gasket C10166-030
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345921- SKU:
- 09345921
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,075'
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.075'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Cylinder Head Gasket C10166
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345920- SKU:
- 09345920
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,095'
- BORE SIZE IMPERIAL:
- 4.095'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
MSRP: $61.90Now: $58.00Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $58.00Was: $61.90Subtotal: -
On Sale
COMETIC Cylinder Head Gasket C10165-030
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345919- SKU:
- 09345919
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,000'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Cylinder Head Gasket C10164
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345915- SKU:
- 09345915
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- MATERIAL:
- VITON
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
MSRP: $61.90Now: $58.00Was: $61.90 -
JAMES GASKET Head Gasket - FL JGI-16770-66SXK
JAMES GASKET
$86.95Made in the U.S.A.09345877- SKU:
- 09345877
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- STYLE:
- STANDARD BORE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- MATERIAL:
- -
- THICKNESS IMPERIAL:
- 0,032'
- BORE SIZE IMPERIAL:
- -
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$86.95 -
JAMES GASKET Foamet‚® Head Gasket JGI-16770-66-SX
JAMES GASKET
$34.95JAMES GASKET Foamet® Head Gasket09345876- SKU:
- 09345876
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- MATERIAL:
- FOAMET
$34.95 -
CUSTOM DYNAMICS Squareback Taillight Gasket TLGASKET-5PK
CUSTOM DYNAMICS
$15.80Replaces the stock taillight gasket on all 1999-2020 Harley-Davidson® models equipped with a OEM Squareback Tail Light09345866- SKU:
- 09345866
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$15.80 -
On Sale
COMETIC Derby Gasket C10140F5
COMETIC
Now: $20.00Was: $21.30Derby cover gasket for Harley Davidson models09345060- SKU:
- 09345060
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
- UNITS:
- 5 PACK
Now: $20.00Was: $21.30 -
On Sale
COMETIC Complete Gasket Kit - Buell C10142
COMETIC
MSRP: $288.70Now: $271.00Was: $288.70Every gasket in these kits uses the best materials possible for its intended application, Multi-Layer Steel (MLS) head gaskets, Steel Viton®-coated base gaskets, Blue Viton valve stem seals, Aluminum Foam Material (AFM) race-style exhaust gaskets,...09345058- SKU:
- 09345058
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- BORE SIZE:
- STANDARD
- MATERIAL:
- FOAM
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $288.70Now: $271.00Was: $288.70Qty in Cart: 0Quantity:Price:MSRP: $288.70Now: $271.00Was: $288.70Subtotal:
