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
-
COMETIC Cylinder Head/Base Gasket C10181HB030014
COMETIC
$78.70A quality cylinder head gasket is non-negotiable for maintaining compression, preventing coolant leaks, and preserving engine integrity under high boost or sustained RPM. COMETIC's MLS design delivers the reliability you need, whether you're running...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
$78.70 -
COMETIC Cylinder Head Gasket C10181-030
COMETIC
$61.90A reliable cylinder head gasket is the foundation of any high-performance engine build—it's what stands between optimal compression and catastrophic failure. The COMETIC C10181-030 delivers multi-layer construction designed to handle extreme pressures,...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
$61.90 -
COMETIC Cylinder Head Gasket C10181
COMETIC
$61.90A cylinder head gasket failure can sideline your engine and drain your wallet fast. The COMETIC C10181 is engineered to seal under extreme pressures, temperature swings, and harsh combustion environments without compromising reliability. Built with a...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
$61.90 -
COMETIC Cam Change Gasket Kit C10178
COMETIC
$39.85A cam change requires precision gaskets and seals that can handle thermal cycling and maintain proper compression—using a mismatched or worn kit risks oil leaks and compromised engine integrity. The COMETIC C10178 provides a complete, OEM-quality gasket...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
$39.85 -
COMETIC Cylinder Base Gasket Pair C10177-010
COMETIC
$33.55A quality cylinder base gasket is non-negotiable if you're serious about maintaining cylinder pressure and preventing coolant leaks in high-performance applications. The COMETIC C10177-010 uses multi-layer steel construction with load control embossments...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
$33.55 -
COMETIC Cylinder Head/Base Gasket Pair C10166-HB-030
COMETIC
$81.85A quality cylinder head gasket is non-negotiable if you're serious about engine reliability and performance consistency. The COMETIC C10166-HB-030 uses proven Multi-Layer Steel (MLS) construction to maintain a proper seal under extreme combustion...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
$81.85 -
COMETIC Cylinder Head Gasket C10166-030
COMETIC
$61.90A cylinder head gasket is your engine's primary defense against combustion leakage, coolant seepage, and oil bypass—and when it fails, you're looking at lost compression, overheating, and catastrophic engine damage. The COMETIC C10166-030 is engineered...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
$61.90 -
COMETIC Cylinder Head Gasket C10166
COMETIC
$61.90A cylinder head gasket is your engine's primary defense against combustion leakage, coolant mixing, and catastrophic failure. The COMETIC C10166 delivers reliable sealing across demanding racing conditions and high-heat environments, engineered with...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
$61.90 -
COMETIC Cylinder Head Gasket C10165-030
COMETIC
$61.90A cylinder head gasket is your engine's primary seal against combustion pressure, coolant leakage, and oil migration. The COMETIC C10165-030 uses a three-layer design with stainless steel construction and Viton coating to handle extreme temperatures,...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
$61.90 -
COMETIC Cylinder Head Gasket C10164
COMETIC
$61.90A cylinder head gasket failure can cost you a race or strand you on the side of the road. The COMETIC C10164 delivers reliable sealing across a wide range of engine configurations and operating conditions, thanks to its multi-layer construction and...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
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
JAMES GASKET Head Gasket - FL JGI-16770-66SXK
JAMES GASKET
$86.95A quality head gasket is mission-critical—it's the seal that prevents combustion blow-by and coolant leaks that can compromise engine integrity and performance. The JAMES GASKET FL series delivers OEM-grade sealing reliability with superior material...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
$34.95A reliable head gasket is the foundation of engine integrity—without it, you're risking catastrophic coolant and oil leakage that can destroy an engine in minutes. JAMES GASKET's Foamet® technology delivers superior sealing performance across extreme...09345876- 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
$15.80A deteriorating taillight gasket compromises the weatherproofing of your electrical system, inviting moisture, corrosion, and potential electrical failures at the worst times. This CUSTOM DYNAMICS gasket pack delivers OEM-quality sealing with the added...09345866- SKU:
- 09345866
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$15.80 -
COMETIC Derby Gasket C10140F5
COMETIC
$21.30A worn or damaged derby cover gasket compromises the seal on your Harley's primary cover, leading to oil seepage, contamination, and potential internal damage. The COMETIC Derby Gasket C10140F5 delivers a reliable, OEM-quality seal using premium...09345060- SKU:
- 09345060
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
- UNITS:
- 5 PACK
$21.30Qty in Cart: 0Quantity:Price:$21.30Subtotal: -
COMETIC Complete Gasket Kit - Buell C10142
COMETIC
$288.70A complete gasket kit is your insurance policy against oil seepage, coolant leaks, and combustion blowby that compromise engine reliability and performance. Cometic's C10142 kit eliminates the guesswork of sourcing individual gaskets by bundling every...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
$288.70 -
COMETIC Push Rod Gasket Kit - XL C10133
COMETIC
$19.90Push rod seals are critical to maintaining oil pressure and preventing leakage in high-stress engine environments. The COMETIC C10133 kit delivers reliable sealing with Viton® O-rings engineered to withstand extreme temperatures and demanding race...09345052- SKU:
- 09345052
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- PUSHROD
- UNITS:
- KIT
- MATERIAL:
- VITON
$19.90Qty in Cart: 0Quantity:Price:$19.90Subtotal: -
COMETIC Complete Gasket Kit - 110" C10128-040
COMETIC
$169.00A complete gasket kit eliminates the guesswork when rebuilding or refreshing your 110" engine—you get every seal and gasket engineered for your application in one package, reducing installation time and the risk of mismatched components causing leaks...09345051- SKU:
- 09345051
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- MOTOR
- UNITS:
- KIT
- MATERIAL:
- STEEL
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$169.00 -
COMETIC Complete Gasket Kit - 110" C10128
COMETIC
$169.00A complete gasket kit is the foundation of any reliable engine build—one failed gasket can compromise your entire engine's integrity and sideline your project. The COMETIC C10128 eliminates guesswork by pairing application-specific materials in a single,...09345050- SKU:
- 09345050
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- STEEL
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- MOTOR
- UNITS:
- KIT
- BORE SIZE:
- 4,000'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 4.000'
$169.00 -
COMETIC Base Seal Gasket C10127
COMETIC
$10.95A failing base seal gasket compromises your Sportster's combustion integrity and invites oil seepage that can damage your engine block and transmission housing. The COMETIC Base Seal Gasket C10127 is engineered to maintain a perfect seal under extreme...09345049- SKU:
- 09345049
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
$10.95 -
COMETIC Primary Gasket Kit C9125
COMETIC
$43.00A primary gasket kit is only as reliable as its ability to seal under extreme heat and pressure—and factory gaskets often fail prematurely, leading to oil leaks and loss of performance. Cometic's C9125 Primary Gasket Kit uses proprietary AFM (Aluminum...09344801- SKU:
- 09344801
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- PRIMARY
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
$43.00
