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
JAMES GASKET Front Oil Pump O-Ring 10967
JAMES GASKET
Now: $4.00Was: $6.20A failing front oil pump O-ring doesn't just leak—it compromises your engine's lubrication system when you need it most. The JAMES GASKET Front Oil Pump O-Ring 10967 is engineered to seal tight under pressure, preventing oil loss that can lead to...09351086- SKU:
- 09351086
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- OIL PUMP CAP
Now: $4.00Was: $6.20 -
On Sale
JAMES GASKET Oil Pump Valve O-Ring 10971
JAMES GASKET
MSRP: $3.95Now: $3.00Was: $5.20A properly functioning oil pump valve is critical to maintaining consistent oil pressure and protecting your engine's internal components from starvation and wear. This JAMES GASKET O-ring replacement ensures a reliable seal in your oil pump valve...09351088- SKU:
- 09351088
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- OIL PUMP VALVE
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
MSRP: $3.95Now: $3.00Was: $5.20 -
JAMES GASKET Oil Line O-Ring - Softail 11326
JAMES GASKET
$8.40Oil line O-rings are critical wear items that prevent leaks at connection points and maintain system pressure integrity. A failed or degraded O-ring compromises oil delivery, increases contamination risk, and can lead to catastrophic engine damage. The...09350281- SKU:
- 09350281
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 10 PACK
- APPLICATION:
- MOTOR
- APPLICATION:
- OIL LINE
- PRODUCT NAME:
- O-RING
$8.40 -
JAMES GASKET Interconnect Oil Seal 45359-00
JAMES GASKET
$20.30Prevent costly oil leakage and internal contamination with the JAMES GASKET Interconnect Oil Seal 45359-00, engineered to maintain pressure integrity across critical engine passages. This OEM-grade seal is essential for preserving hydraulic separation...09350252- SKU:
- 09350252
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CHAIN GUIDE SUPPORT
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- APPLICATION:
- ENGINE BALANCER
- RIDING STYLE:
- STREET
$20.30 -
JAMES GASKET Oil Retain Gasket - XL 35169-52-F
JAMES GASKET
$7.80A compromised oil seal leads to messy leaks, lost lubrication, and potential engine damage—especially under the demanding conditions of track use or high-performance builds. The JAMES GASKET Oil Retain Gasket XL delivers a positive, long-lasting seal...09344643- SKU:
- 09344643
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- FOAMET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL SEAL RETAINER
$7.80 -
JAMES GASKET Oil Pump Gasket Kit HVHP
JAMES GASKET
$22.00A failing oil pump gasket compromises your engine's lubrication system, risking catastrophic bearing wear and complete engine failure. The JAMES GASKET Oil Pump Gasket Kit HVHP gives you everything needed to fully rebuild or rebush your oil pump,...09341552- SKU:
- 09341552
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- OIL PUMP
$22.00 -
COMETIC Top End Gasket - 3-13/16" C9969
COMETIC
$142.17A compromised top end gasket kit leaves your engine vulnerable to combustion leakage, coolant seepage, and catastrophic thermal failure—especially under sustained boost or high RPM loads. The COMETIC C9969 EST gasket set eliminates these risks by...09340820- SKU:
- 09340820
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE:
- 3,8125'
- MATERIAL:
- FOAM
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 3.8125'
- UNITS:
- KIT
$142.17 -
COMETIC Trans Gasket - Big Twin C9469
COMETIC
$85.94Transmission gasket failures lead to fluid leaks, loss of hydraulic pressure, and catastrophic drivetrain damage—especially in high-performance Big Twin applications where tolerances are unforgiving. The COMETIC Trans Gasket C9469 eliminates guesswork by...09340824- SKU:
- 09340824
- Availability:
- Ships Same Business Day
- Weight:
- 1.22 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$85.94 -
COMETIC Trans Gasket - Twin Cam C9639
COMETIC
$49.56Transmission gasket failures compromise seal integrity and lead to costly fluid leaks and internal damage. The COMETIC Trans Gasket C9639 delivers application-specific engineering with precision-fitted materials designed to maintain reliable sealing...09340826- SKU:
- 09340826
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$49.56 -
COMETIC Trans Gasket - Big Twin C9464F
COMETIC
$47.35Transmission gasket failure is one of the most common reasons for fluid leaks and costly rebuilds on Big Twin engines. The COMETIC Trans Gasket C9464F eliminates guesswork by providing a complete, application-specific seal kit engineered to withstand the...09340827- SKU:
- 09340827
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
$47.35 -
COMETIC Trans Gasket - 4 Speed C9465
COMETIC
$70.51Transmission gasket failures lead to fluid leaks, loss of pressure, and catastrophic drivetrain damage—exactly what you can't afford during competition or spirited driving. The COMETIC Trans Gasket C9465 eliminates guesswork with application-specific...09340828- SKU:
- 09340828
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- TYPE:
- TRANSMISSION
$70.51 -
COMETIC One Piece Rocker Base - Evo C9865
COMETIC
$23.10A failing rocker box gasket means oil seepage, contamination, and potential engine damage—exactly what you can't afford on track or in the shop. The COMETIC One Piece Rocker Base gasket eliminates the weak points of multi-piece designs with a...09340001- SKU:
- 09340001
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- ROCKER BOX
$23.10 -
COMETIC Base Gasket - Evo - 1340 - .020" C9870
COMETIC
$35.23A proper head gasket is non-negotiable for any Evo build seeking reliable power and consistent cylinder pressure. The COMETIC MLS design distributes clamping force evenly across the sealing surface, reducing bore distortion and maximizing ring...09340004- SKU:
- 09340004
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- THICKNESS METRIC:
- 0.51 MM
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
$35.23 -
COMETIC Base Gasket - Evo - 4" - .020" C9872
COMETIC
$35.23A compromised head gasket is a ticking time bomb for any serious Evo build—it'll cost you power, reliability, and credibility on the track. The COMETIC Base Gasket delivers the precision sealing and durability your engine demands, with MLS construction...09340006- SKU:
- 09340006
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- STYLE:
- STANDARD
$35.23 -
COMETIC Tappet Cover Gasket C10172
COMETIC
$23.30A failing tappet cover gasket compromises engine seal integrity and invites oil leakage that can damage surrounding components. The COMETIC Tappet Cover Gasket C10172 delivers reliable sealing performance with OEM-quality construction, ensuring your...09345933- SKU:
- 09345933
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- TAPPET COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
$23.30 -
COMETIC Cylinder Head Gasket C10192
COMETIC
$64.99A cylinder head gasket is your engine's first line of defense against combustion blow-by and coolant leakage—failure here means catastrophic engine damage. The COMETIC C10192 uses a multi-layer design with stainless steel construction and Viton sealing...09345953- SKU:
- 09345953
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 4,320'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.320'
- MATERIAL:
- LAYERED STEEL
$64.99 -
COMETIC Cylinder Head Gasket C10193
COMETIC
$64.99A cylinder head gasket is your engine's primary defense against combustion blow-by, coolant mixing, and oil seepage—failures that cascade into catastrophic engine damage. The COMETIC C10193 is engineered for demanding racing and high-boost applications...09345955- SKU:
- 09345955
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE IMPERIAL:
- 4.500'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,500'
- MATERIAL:
- LAYERED STEEL
$64.99 -
COMETIC Cylinder Head/Base Gasket C10193-HB
COMETIC
$85.94A compromised cylinder head or base gasket will cost you more in downtime and engine damage than the price of this kit. The COMETIC C10193-HB uses Multi-Layer Steel (MLS) construction to maintain a reliable seal under high combustion pressures and...09345956- SKU:
- 09345956
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE IMPERIAL:
- 4.500'
- THICKNESS IMPERIAL:
- 0,014'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- THICKNESS:
- 0,36 MM (0,014')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,500'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
$85.94 -
COMETIC Cylinder Base Gasket Pair C10194
COMETIC
$35.23A properly sealed cylinder base is non-negotiable for consistent power delivery and engine longevity. The COMETIC C10194 uses multi-layer steel construction with load control embossments to distribute clamping force evenly across the gasket surface,...09345957- SKU:
- 09345957
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- THICKNESS IMPERIAL:
- 0,014'
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.320'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
$35.23 -
COMETIC Oil Filler Gasket C9266F
COMETIC
$36.70Oil filler gaskets are a critical seal point in your engine's breathing system—a failure here means potential oil leakage, contamination, and loss of pressure integrity. The COMETIC C9266F eliminates guesswork with a proven Aluminum Foamette construction...09341387- SKU:
- 09341387
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- OIL FILLER
$36.70
