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 Clutch Hub Nut Seal C9494
COMETIC
$6.40A properly sealed clutch hub nut is critical to preventing fluid leakage and maintaining clutch system integrity under racing conditions. The COMETIC C9494 seals the interface where your clutch hub nut seats, eliminating the risk of gear oil weeping that...09350196- SKU:
- 09350196
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- STYLE:
- DUAL LIP
- APPLICATION:
- CLUTCH HUB
- PRODUCT NAME:
- SEAL
$6.40 -
COMETIC Main Drive Gear Seal C9506
COMETIC
$8.90A leaking main drive gear seal doesn't just waste oil—it risks catastrophic engine damage and costly downtime. The COMETIC C9506 delivers factory-grade sealing reliability without the factory wait times, engineered to handle the demands of high-revving...09350197- SKU:
- 09350197
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
$8.90 -
COMETIC Inspection Cover Gasket - FX C9331F5
COMETIC
$18.40A leaking inspection cover gasket compromises engine seal integrity and can lead to oil seepage that damages surrounding components. The COMETIC C9331F5 delivers a precision-engineered seal that prevents fluid loss while maintaining factory fitment...20111495- SKU:
- 20111495
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
- TYPE:
- INSPECTION COVER
- THICKNESS:
- 1,52 MM (0,060')
$18.40Qty in Cart: 0Quantity:Price:$18.40Subtotal: -
COMETIC O-Ring C10210
COMETIC
$6.80A quality o-ring is the backbone of any sealed system—without proper sealing, you're looking at leaks, contamination, and catastrophic failure. The Cometic O-Ring C10210 delivers the precision fit and material durability that professional racers and...09350999- SKU:
- 09350999
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- APPLICATION:
- OIL PUMP
- UNITS:
- 10 PACK
$6.80 -
COMETIC Top End Gasket - Big Bore - Big Twin - EST C9767
COMETIC
$176.35A top-end rebuild demands precision sealing—any gasket failure means catastrophic engine damage and costly downtime. The COMETIC EST C9767 eliminates hot spots that cause premature gasket failure by actively drawing heat away from the combustion ring and...DS172079- SKU:
- DS172079
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE IMPERIAL:
- 3.625'
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE:
- 3,625'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$176.35Qty in Cart: 0Quantity:Price:$176.35Subtotal: -
COMETIC Top End Gasket - Big Twin - EST C9635
COMETIC
$142.75A top-end rebuild demands gaskets engineered to survive extreme combustion temperatures and cylinder pressures—and Cometic's EST technology delivers exactly that. The embossed stainless steel construction with proprietary rubber facing eliminates hot...DS172080- SKU:
- DS172080
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$142.75 -
COMETIC Top End Gasket - Big Twin - EST C9747
COMETIC
$142.75Gasket failure compromises cylinder sealing and leads to combustion pressure loss, oil leakage, and costly downtime. COMETIC's EST gaskets eliminate hot spots through advanced heat dissipation, delivering reliable sealing across repeated heat cycles that...DS172081- SKU:
- DS172081
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
$142.75 -
COMETIC Top End Gasket Kit - Twin Cam 88 - EST C9779
COMETIC
$183.70A top-end gasket failure can sideline your Twin Cam 88 when you can least afford it. COMETIC's EST (Extreme Sealing Technology) kits eliminate the guesswork with precision-engineered gaskets designed to manage combustion heat and prevent hot spots that...DS172084- SKU:
- DS172084
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE IMPERIAL:
- 3.750'
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE:
- 3,750'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$183.70 -
COMETIC Engine Gasket Kit - 110" C10157
COMETIC
$287.65A complete gasket failure can sideline your engine and derail your season. The COMETIC C10157 110" gasket kit uses purpose-engineered materials for each sealing application, ensuring reliable compression and leak-free performance across the entire motor...09345074- SKU:
- 09345074
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$287.65 -
COMETIC Engine Gasket Kit - 110" C10157-030
COMETIC
$287.65A complete engine gasket failure can leave you stranded—or worse, damage an otherwise solid build. The COMETIC C10157-030 gasket kit eliminates guesswork by providing OEM-quality sealing across your entire engine, using purpose-engineered materials for...09345075- SKU:
- 09345075
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
$287.65Qty in Cart: 0Quantity:Price:$287.65Subtotal: -
COMETIC Top End Gasket Kit - 883 C9194
COMETIC
$229.90A failing top-end gasket can compromise combustion chamber integrity and lead to costly coolant leaks or compression loss. The COMETIC C9194 eliminates guesswork by supplying every gasket, seal, and O-ring needed for a complete top-end rebuild—engineered...09344805- SKU:
- 09344805
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE IMPERIAL:
- 3.000'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,000'
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- DISPLACEMENT:
- 883 CC
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
$229.90Qty in Cart: 0Quantity:Price:$229.90Subtotal: -
COMETIC Primary Gasket Kit C9210
COMETIC
$56.65A primary gasket kit is fundamental to any high-performance engine build—seal failure leads to oil weeping, contamination, and power loss. Cometic's AFM material delivers the reliability you need for both street and race applications, with superior...09344806- SKU:
- 09344806
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
$56.65 -
COMETIC Primary Gasket C9309F1
COMETIC
$45.10A properly sealed primary cover is critical to maintaining oil pressure, preventing leakage, and extending engine life—especially in high-performance applications where thermal cycling and vibration accelerate gasket failure. Cometic's AFM gaskets...09344808- SKU:
- 09344808
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- EACH
- THICKNESS IMPERIAL:
- 0.060'
$45.10 -
COMETIC Primary Gasket - Softail C9607F1
COMETIC
$45.10A properly sealed primary case is non-negotiable for reliable Softail performance—leaks compromise your engine's integrity and create maintenance headaches. The COMETIC Primary Gasket C9607F1 eliminates guesswork with precision-engineered gasket...09344809- SKU:
- 09344809
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- PRIMARY
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- EACH
$45.10Qty in Cart: 0Quantity:Price:$45.10Subtotal: -
COMETIC Engine Gasket Kit - EVO/XL C9755F
COMETIC
$257.20A quality gasket kit is the foundation of reliable engine sealing—leaks, compression loss, and coolant mixing can cascade into catastrophic engine failure. The COMETIC C9755F delivers multi-layer steel construction and Viton® sealing surfaces across all...09344812- SKU:
- 09344812
- Availability:
- Ships Same Business Day
- Weight:
- 1.81 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- BORE SIZE IMPERIAL:
- 3.000'
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,000'
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
$257.20 -
COMETIC Complete Gasket Kit - Big Twin C10112
COMETIC
$209.95A complete gasket failure can leave you stranded mid-season or cost you a race. COMETIC's Big Twin C10112 kit eliminates the guesswork by providing OEM-quality gaskets for every critical seal on your engine—head gaskets, base gaskets, valve stems, and...09344733- SKU:
- 09344733
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$209.95 -
COMETIC Complete Gasket Kit - Big Twin C10113
COMETIC
$209.95A complete gasket failure can cost you days in the shop and thousands in lost racing time. The COMETIC Complete Gasket Kit for Big Twin engines eliminates guesswork by pairing the right material to each sealing surface—Multi-Layer Steel for cylinder...09344734- SKU:
- 09344734
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE IMPERIAL:
- 4.060'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- KIT
- BORE SIZE:
- 4,060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
$209.95 -
COMETIC Primary Filler O-Ring C9446
COMETIC
$5.30A leaking primary cover gasket can compromise your engine's performance and longevity by allowing fuel and oil to escape where they shouldn't. The COMETIC Primary Filler O-Ring C9446 seals your primary cover with precision-engineered reliability, using...09344704- SKU:
- 09344704
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- FILLER
- MATERIAL:
- NITRILE RUBBER
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
$5.30Qty in Cart: 0Quantity:Price:$5.30Subtotal: -
COMETIC Head Gasket C9564-2
COMETIC
$23.05A head gasket failure can compromise your engine's integrity and cost you significant downtime and money. The COMETIC C9564-2 delivers reliable sealing across demanding racing and high-performance applications by distributing load evenly and minimizing...09344708- SKU:
- 09344708
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- PAIR
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- CYLINDER HEAD
$23.05 -
COMETIC Head Gasket C9565-2
COMETIC
$23.05A head gasket is your engine's first line of defense against combustion pressure, coolant leaks, and oil bypass—and it demands precision engineering to perform under extreme conditions. The COMETIC C9565-2 uses multi-layer steel construction with...09344709- SKU:
- 09344709
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- PAIR
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CYLINDER HEAD
$23.05
