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
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COMETIC Rear Tapped Gasket - Big Twin C9297F
COMETIC
$5.30A properly sealed engine is the foundation of reliable performance, and Cometic's rear tapped gasket eliminates the weak point where your Big Twin crankcase meets the transmission. This precision-engineered gasket prevents oil weeping and maintains...09341351- SKU:
- 09341351
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- TYPE:
- TAPPET GUIDE
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
$5.30 -
COMETIC Front Tappet Gasket - Big Twin C9298F
COMETIC
$6.40The COMETIC Front Tappet Gasket is engineered to eliminate oil seepage at the tappet cover, a common failure point on Big Twin engines. A compromised gasket leads to messy leaks, potential oil starvation, and costly engine damage—this OEM-quality...09341352- SKU:
- 09341352
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- TYPE:
- TAPPET GUIDE
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 0.81 MM
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- FRONT
- THICKNESS IMPERIAL:
- 0,032'
$6.40 -
COMETIC Head Gasket - .04" - 3 13/16" C9693
COMETIC
$61.90A head gasket failure will cost you far more in downtime and engine damage than the price of a quality replacement. The Cometic C9693 uses multi-layer steel construction with load control embossments to maintain consistent clamping force across the...09341356- SKU:
- 09341356
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 3,8125'
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- UNITS:
- PAIR
- THICKNESS METRIC:
- 1.02 MM
$61.90 -
COMETIC Shift Sleeve O-Ring C9484
COMETIC
$9.50Shift sleeve o-rings endure extreme heat, pressure, and fuel exposure during performance driving—and failure means transmission fluid leakage, loss of shift precision, and costly downtime. The COMETIC C9484 is engineered with fuel-resistant elastomer...09341372- SKU:
- 09341372
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- SHIFTER LEVER
$9.50 -
COMETIC Primary Gasket C9943F5
COMETIC
$83.50A primary gasket is critical to maintaining a sealed, leak-free engine case—especially under high RPM and boost conditions where pressure spikes demand absolute reliability. COMETIC's C9943F5 delivers the durability and precision fit that professional...09340747- SKU:
- 09340747
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
$83.50 -
COMETIC Double Lip Seal C9350
COMETIC
$14.80A quality crankshaft seal is the difference between a clean engine bay and catastrophic oil leakage under sustained load. The COMETIC Double Lip Seal C9350 delivers the reliability you need for high-performance applications, engineered with premium...09350171- SKU:
- 09350171
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- CAM COVER
- PRODUCT NAME:
- SEAL
$14.80 -
COMETIC O-Ring C10201
COMETIC
$11.90Proper sealing is non-negotiable in high-performance engine builds, and a compromised O-ring can lead to costly leaks and catastrophic failures. The COMETIC C10201 delivers reliable, precision sealing for critical engine applications where margin for...09350990- SKU:
- 09350990
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CYLINDER
- RIDING STYLE:
- ATV
- UNITS:
- 10 PACK
$11.90 -
COMETIC Primary Seal Kit C10248
COMETIC
$86.05A primary seal kit is the foundation of a leak-free, reliable engine—and Cometic's AFM gasket material sets the standard for high-performance applications. Whether you're running a street engine or a race-prepped mill, this kit delivers the durability...09351031- SKU:
- 09351031
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
- TYPE:
- PRIMARY
$86.05 -
COMETIC Top End Gasket Twin Cam - EST C9976-030
COMETIC
$150.10A failed top-end gasket can sideline your engine and drain your wallet. The COMETIC EST C9976-030 eliminates guesswork by delivering a complete, purpose-built gasket kit engineered to handle sustained combustion pressures and thermal cycling without...09341663- SKU:
- 09341663
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- TOP END
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- THICKNESS METRIC:
- 0.76 MM
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- RUBBER
- UNITS:
- KIT
$150.10 -
COMETIC Head Gasket - 4.000" x .030" C10084-030
COMETIC
$59.80A properly sealed combustion chamber is non-negotiable for consistent power delivery and engine longevity. COMETIC's MLS head gasket design minimizes bore distortion through load-control embossments, ensuring reliable sealing across demanding boost...09343147- SKU:
- 09343147
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- TYPE:
- CYLINDER HEAD
$59.80 -
COMETIC Head Gasket - 4.060" x .030" C10085-030
COMETIC
$59.80A head gasket failure can cost you thousands in engine damage and lost track time. COMETIC's MLS design distributes clamping force evenly across the sealing surface, reducing bore distortion and maximizing ring seal for consistent power delivery. Built...09343149- SKU:
- 09343149
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,060'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.060'
- THICKNESS IMPERIAL:
- 0,030'
$59.80 -
COMETIC Head Gasket - 4.125" x .040" C10086-040
COMETIC
$59.80A quality head gasket is the foundation of reliable cylinder sealing and consistent compression. The COMETIC C10086-040 delivers precision engineering with its multi-layer steel construction, designed to maintain a tight seal across demanding racing and...09343152- SKU:
- 09343152
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.125'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- UNITS:
- PAIR
$59.80 -
COMETIC Primary Gasket C9309F5
COMETIC
$120.50A primary gasket is critical to maintaining a sealed, leak-free crankcase in high-performance engines where internal pressures and temperature fluctuations demand absolute reliability. The COMETIC C9309F5 is engineered to withstand sustained RPM and...20111488- SKU:
- 20111488
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,52 MM (0,060')
- MOUNTING POSITION:
- OUTER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
$120.50 -
COMETIC Primary Gasket Kit C9889
COMETIC
$101.80A primary gasket kit failure means oil leaks, performance loss, and costly downtime. The COMETIC C9889 eliminates these risks with AFM gaskets engineered for extreme heat and pressure, delivering reliable sealing that holds torque cycle after cycle...09340744- SKU:
- 09340744
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
$101.80 -
FEULING OIL PUMP CORP. Chain Drive Cams - 525 Series - Twin Cam 1006
FEULING OIL PUMP CORP.
$399.95If you're running a stock or modified Twin Cam engine and want measurable gains in low-end torque and throttle response without a complete valve train overhaul, the Feuling 525 Series Chain Drive Cams deliver immediate, usable power where it matters most...09250427- SKU:
- 09250427
- Availability:
- Ships Same Business Day
- Weight:
- 3.28 LBS
- APPLICATION:
- INTAKE
- EXHAUST CLOSE IMPERIAL:
- 5°
- GRIND:
- 525 SERIES
- INTAKE DURATION IMPERIAL:
- 226°
- APPLICATION:
- EXHAUST
- EXHAUST OPEN IMPERIAL:
- 51°
- INTAKE OPEN IMPERIAL:
- 4°
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- CHAIN
- EXHAUST LIFT IMPERIAL:
- 0.535'
- INTAKE CLOSE IMPERIAL:
- 42°
- INTAKE LIFT IMPERIAL:
- 0.525'
- MODEL:
- REAPER
- UNITS:
- PAIR
- EXHAUST DURATION IMPERIAL:
- 236°
- RIDING STYLE:
- STREET
$399.95 -
FEULING OIL PUMP CORP. Conversion Cams - 525 Series - Twin Cam 1016
FEULING OIL PUMP CORP.
$409.95If you're running a stock or mildly modified Twin Cam and want to unlock real-world power gains without a complete top-end overhaul, the Feuling 525 Series cams deliver where it counts. You'll feel the difference immediately—sharper throttle response,...09250606- SKU:
- 09250606
- Availability:
- Ships Same Business Day
- Weight:
- 3.10 LBS
- APPLICATION:
- EXHAUST
- EXHAUST LIFT IMPERIAL:
- 0.535'
- EXHAUST OPEN IMPERIAL:
- 51°
- INTAKE CLOSE IMPERIAL:
- 42°
- MODEL:
- REAPER
- APPLICATION:
- INTAKE
- EXHAUST CLOSE IMPERIAL:
- 5°
- EXHAUST DURATION IMPERIAL:
- 236°
- INTAKE DURATION IMPERIAL:
- 226°
- RIDING STYLE:
- STREET
- TYPE:
- CHAIN CONVERSION
- GRIND:
- 525 SERIES
- INTAKE LIFT IMPERIAL:
- 0.525'
- INTAKE OPEN IMPERIAL:
- 4°
- PRODUCT NAME:
- CAMSHAFT
- UNITS:
- PAIR
$409.95 -
FEULING OIL PUMP CORP. Gear Drive Cams - 525 Series 1004
FEULING OIL PUMP CORP.
$399.95If you're running a stock or mildly modified big-twin engine, you're leaving power on the table without optimized cam timing. The Feuling Oil Pump Corp. 525 Series Gear Drive Cam transforms your engine's low and mid-range performance, delivering the...09250425- SKU:
- 09250425
- Availability:
- Ships Same Business Day
- Weight:
- 2.86 LBS
- APPLICATION:
- EXHAUST
- EXHAUST LIFT IMPERIAL:
- 0.535'
- GRIND:
- 525 SERIES
- APPLICATION:
- INTAKE
- EXHAUST CLOSE IMPERIAL:
- 5°
- EXHAUST OPEN IMPERIAL:
- 51°
- INTAKE DURATION IMPERIAL:
- 226°
- TYPE:
- GEAR
- INTAKE CLOSE IMPERIAL:
- 42°
- MODEL:
- REAPER
- EXHAUST DURATION IMPERIAL:
- 236°
- INTAKE LIFT IMPERIAL:
- 0.525'
- INTAKE OPEN IMPERIAL:
- 4°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
$399.95 -
FEULING OIL PUMP CORP. Chain Drive Cams - 525 Series 1001
FEULING OIL PUMP CORP.
$399.95If you're running a stock or mildly modified big-twin and want noticeable gains in low-end torque and throttle response without a complete valve train overhaul, the Feuling 525 Series delivers exactly that. This bolt-in camshaft expands your usable power...09250513- SKU:
- 09250513
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- APPLICATION:
- EXHAUST
- EXHAUST LIFT IMPERIAL:
- 0.535'
- GRIND:
- 525 SERIES
- INTAKE DURATION IMPERIAL:
- 226°
- INTAKE CLOSE IMPERIAL:
- 42°
- INTAKE LIFT IMPERIAL:
- 0.525'
- MODEL:
- REAPER
- APPLICATION:
- INTAKE
- EXHAUST CLOSE IMPERIAL:
- 5°
- EXHAUST OPEN IMPERIAL:
- 51°
- TYPE:
- CHAIN
- EXHAUST DURATION IMPERIAL:
- 236°
- INTAKE OPEN IMPERIAL:
- 4°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
$399.95 -
EASTERN MOTORCYCLE PARTS Pushrod - Right End A-37089-84
EASTERN MOTORCYCLE PARTS
$24.95A properly functioning pushrod is critical to maintaining valve train precision and engine reliability. The EASTERN MOTORCYCLE PARTS Pushrod (Right End A-37089-84) ensures consistent valve actuation and eliminates the performance loss that comes with...DS192522- SKU:
- DS192522
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DIAMETER IMPERIAL:
- 2.625'
- PRODUCT NAME:
- PUSHROD END
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- RIGHT
- TYPE:
- CLUTCH
$24.95 -
EASTERN MOTORCYCLE PARTS Cam Bushing A-25581-70
EASTERN MOTORCYCLE PARTS
$37.95A worn or damaged cam bushing compromises valve timing precision and can lead to excessive wear on your camshaft and cylinder head. This OEM-spec Eastern Motorcycle Parts bushing restores proper fit and clearance, ensuring reliable valve actuation and...DS194198- SKU:
- DS194198
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- BUSHING
- TYPE:
- SUPPORT PLATE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$37.95
