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 Trans Gasket - 4 Speed C9465
COMETIC
$67.15Transmission 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
$67.15 -
COMETIC One Piece Rocker Base - Evo C9865
COMETIC
$22.00A 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
$22.00 -
COMETIC Base Gasket - Evo - 1340 - .020" C9870
COMETIC
$33.55A 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'
$33.55 -
COMETIC Base Gasket - Evo - 4" - .020" C9872
COMETIC
$33.55A 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
$33.55 -
COMETIC Cylinder Head/Base Gasket Pair C10167-HB-030
COMETIC
$81.85A quality head gasket is non-negotiable for engine reliability and performance. The COMETIC C10167-HB-030 uses proven Multi-Layer Steel (MLS) construction to withstand combustion pressures, thermal cycling, and boost—whether you're running stock power or...09345927- SKU:
- 09345927
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.145'
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,145'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
$81.85Qty in Cart: 0Quantity:Price:$81.85Subtotal: -
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 Cam Cover Gasket 5 Pack C10173
COMETIC
$24.80Cam cover gaskets are a wear item that deteriorates with heat cycles and engine vibration—a failed gasket leads to oil seepage, reduced engine cleanliness, and potential damage to ignition components. The COMETIC Cam Cover Gasket 5 Pack gives you...09345934- SKU:
- 09345934
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CAM COVER
- UNITS:
- 5 PACK
$24.80 -
COMETIC Piston Jet Gasket Pair C10174
COMETIC
$5.95Piston jet gaskets are critical sealing components that prevent oil leakage in your engine's cooling gallery system. A compromised gasket leads to oil loss, potential engine overheating, and catastrophic failure under high-RPM conditions. The COMETIC...09345935- SKU:
- 09345935
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- PISTON JET COOLER
- UNITS:
- 2 PACK
- THICKNESS IMPERIAL:
- 0,032'
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
COMETIC Cylinder Base Gasket Pair C10177
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for reliable power and longevity in high-performance engines. The COMETIC C10177 delivers precision sealing with multi-layer construction designed to handle extreme pressures, temperature swings, and...09345937- SKU:
- 09345937
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.36 MM
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- TYPE:
- CYLINDER BASE
- UNITS:
- 2 PACK
$33.55Qty in Cart: 0Quantity:Price:$33.55Subtotal: -
COMETIC Cylinder Head Gasket C10192
COMETIC
$61.90A 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
$61.90 -
COMETIC Cylinder Head Gasket C10193
COMETIC
$61.90A 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
$61.90 -
COMETIC Cylinder Head/Base Gasket C10193-HB
COMETIC
$81.85A 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')
$81.85 -
COMETIC Cylinder Base Gasket Pair C10194
COMETIC
$33.55A 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
$33.55 -
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 -
COMETIC Speed Drive Gasket C9512F
COMETIC
$5.30Eliminate guesswork at the gasket line with the COMETIC Speed Drive Gasket C9512F—a purpose-built solution engineered to handle high-RPM demands without the headache of traditional sealer application. The aluminum foamette construction provides superior...09341388- SKU:
- 09341388
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- SPEEDOMETER DRIVE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
$5.30 -
COMETIC Neutral Switch O-Ring C9642
COMETIC
$9.50A reliable neutral switch o-ring is critical for maintaining proper electrical continuity and preventing fuel leaks in your transmission system. The COMETIC C9642 is engineered with premium fuel-resistant elastomers that withstand extreme temperatures...09341389- SKU:
- 09341389
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- NEUTRAL GEAR SWITCH
- UNITS:
- 10 PACK
- MATERIAL:
- NITRILE RUBBER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
$9.50Qty in Cart: 0Quantity:Price:$9.50Subtotal: -
COMETIC Trans Top Cover Gasket C9645F
COMETIC
$18.60A quality head gasket is the foundation of engine reliability—especially when you're pushing high horsepower and boost levels. The COMETIC C9645F combines multi-layered steel construction with advanced sealing technology to handle extreme cylinder...09341391- SKU:
- 09341391
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- TRANSMISSION TOP COVER
$18.60Qty in Cart: 0Quantity:Price:$18.60Subtotal: -
COMETIC Air Cleaner Gasket C9301
COMETIC
$13.30A worn or damaged air cleaner gasket compromises your engine's intake seal, allowing unfiltered air to bypass your filter element and introducing contaminants directly into the combustion chamber. The COMETIC C9301 restores that critical seal with...09341394- SKU:
- 09341394
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 20 PACK
- PRODUCT NAME:
- GASKET
- TYPE:
- AIR CLEANER
$13.30 -
COMETIC Outer Rocker Gasket C9196
COMETIC
$22.00Rocker cover gaskets endure constant thermal cycling and oil exposure—factory gaskets fail prematurely under sustained engine loads. The COMETIC C9196 delivers reliable sealing with a dual-layer Viton design that resists oil degradation and maintains...09341395- SKU:
- 09341395
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- MOUNTING POSITION:
- LOWER
- MOUNTING POSITION:
- OUTER
- TYPE:
- ROCKER COVER
$22.00 -
COMETIC Rocker Breather Seal C9198
COMETIC
$9.40Crankcase pressure management directly impacts engine reliability and longevity. The COMETIC Rocker Breather Seal C9198 prevents oil seepage and maintains proper ventilation in your rocker cover assembly, eliminating messy leaks that compromise engine...09341397- SKU:
- 09341397
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- ROCKER COVER
- MATERIAL:
- SILICONE
- UNITS:
- PAIR
$9.40
