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
COMETIC Motor Gasket Kit - 4" C9940
COMETIC
MSRP: $356.95Now: $321.26Was: $356.95A complete gasket failure can cost you a race and thousands in engine damage. The COMETIC Motor Gasket Kit C9940 delivers the reliability you need with premium materials engineered for sustained...09340810- SKU:
- 09340810
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- TYPE:
- MOTOR
- UNITS:
- KIT
- BORE SIZE:
- 4,000'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
MSRP: $356.95Now: $321.26Was: $356.95Qty in Cart: 0Quantity:Price:MSRP: $356.95Now: $321.26Was: $356.95Subtotal: -
On Sale
COMETIC Trans Mainshaft Seal - 5 Pack C9356
COMETIC
Now: $7.38Was: $8.20Transmission fluid leaks are costly problems that compromise performance and reliability. The COMETIC Trans Mainshaft Seal C9356 replaces worn OEM seals with precision-engineered components that...09341404- SKU:
- 09341404
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- APPLICATION:
- TRANSMISSION
- UNITS:
- 5 PACK
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
Now: $7.38Was: $8.20Qty in Cart: 0Quantity:Price:Now: $7.38Was: $8.20Subtotal: -
On Sale
COMETIC Primary Spacer Gasket C9942F5
COMETIC
Now: $7.02Was: $7.80Proper primary spacing is critical for Twin Cam engine reliability and shift quality. The COMETIC Primary Spacer Gasket C9942F5 maintains precise clearances between primary components, preventing...09341405- SKU:
- 09341405
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS:
- 1,52 MM (0,060')
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WASHER
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY SPACER
- UNITS:
- 5 PACK
Now: $7.02Was: $7.80 -
On Sale
COMETIC Cam Cover Gasket - Big Twin C9328F5
COMETIC
Now: $23.94Was: $26.60A failing cam cover gasket compromises engine sealing and creates oil leaks that compromise both performance and engine longevity. The COMETIC C9328F5 is engineered specifically for Big Twin...20111498- SKU:
- 20111498
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- CAM COVER
Now: $23.94Was: $26.60 -
On Sale
COMETIC Top End Gasket Kit - Buell C10115
COMETIC
MSRP: $142.75Now: $128.48Was: $142.75A failed top-end gasket can sideline your engine and compromise reliability when you can't afford downtime. The COMETIC C10115 kit eliminates weak points in your seal integrity with Extreme Sealing...09344736- SKU:
- 09344736
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE:
- 3,57'
- BORE SIZE IMPERIAL:
- 3.57'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
MSRP: $142.75Now: $128.48Was: $142.75Qty in Cart: 0Quantity:Price:MSRP: $142.75Now: $128.48Was: $142.75Subtotal: -
On Sale
COMETIC Complete Gasket Kit - Big Twin C10119
COMETIC
MSRP: $159.55Now: $143.60Was: $159.55A complete gasket failure can sideline your Big Twin engine at the worst possible moment—whether you're on the track or the street. The COMETIC C10119 kit eliminates guesswork by providing every...09344738- SKU:
- 09344738
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- BORE SIZE:
- 3,8125'
- TYPE:
- MOTOR
- UNITS:
- KIT
MSRP: $159.55Now: $143.60Was: $159.55Qty in Cart: 0Quantity:Price:MSRP: $159.55Now: $143.60Was: $159.55Subtotal: -
On Sale
COMETIC Rocker Cover Gaskets - .043" C10008
COMETIC
MSRP: $30.40Now: $27.36Was: $30.40Rocker cover gaskets are a critical seal in your engine's valve train—any deterioration leads to oil seepage, contamination of spark plugs, and potential performance loss. COMETIC's .043" gaskets use...09344646- SKU:
- 09344646
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS METRIC:
- 1.09 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,09 MM (0,043')
- UNITS:
- PAIR
- MATERIAL:
- GALVANIZED STEEL
- THICKNESS IMPERIAL:
- 0,043'
- TYPE:
- ROCKER COVER
MSRP: $30.40Now: $27.36Was: $30.40 -
On Sale
COMETIC Rocker Cover Gasket - Big Twin C10008-10
COMETIC
Now: $75.69Was: $84.10A leaking rocker cover gasket doesn't just waste oil—it compromises engine cleanliness and can lead to costly damage if ignored. The COMETIC Rocker Cover Gasket delivers a reliable seal that outlasts...09344647- SKU:
- 09344647
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- THICKNESS IMPERIAL:
- 0,043'
- UNITS:
- 10 PACK
- MATERIAL:
- GALVANIZED STEEL
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,09 MM (0,043')
- TYPE:
- ROCKER COVER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.09 MM
Now: $75.69Was: $84.10 -
On Sale
COMETIC Primary Gasket C9145F5
COMETIC
Now: $108.45Was: $120.50A primary gasket is critical to maintaining a sealed, leak-free engine assembly—especially in high-performance applications where internal pressures exceed stock tolerances. COMETIC's C9145F5...09341341- SKU:
- 09341341
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- THICKNESS:
- 1,52 MM (0,060')
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY
- UNITS:
- 5 PACK
Now: $108.45Was: $120.50 -
On Sale
COMETIC Chain Cover Gasket - XL C9957
COMETIC
Now: $16.56Was: $18.40A properly sealed chain cover is critical to preventing oil seepage and maintaining engine cleanliness in high-performance applications. The COMETIC C9957 Chain Cover Gasket uses Aluminum Foamette...09340787- SKU:
- 09340787
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
Now: $16.56Was: $18.40 -
On Sale
COMETIC Top End Gasket - Standard - .030" C9850
COMETIC
MSRP: $142.75Now: $128.48Was: $142.75A quality top-end gasket kit is non-negotiable for reliable engine performance, and the COMETIC C9850 delivers the sealing integrity your rebuild demands. The EST (Extreme Sealing Technology) design...09340819- SKU:
- 09340819
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
MSRP: $142.75Now: $128.48Was: $142.75 -
COMP CAMS Mega 8 Cam - M8 307-104-9
COMP CAMS
$425.95If you're running a Harley-Davidson M8 and want to unlock serious performance gains without sacrificing reliability, the COMP Cams Mega 8 is the upgrade you've been looking for. These billet steel...09251223- SKU:
- 09251223
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- EXHAUST CLOSE IMPERIAL:
- 12°
- EXHAUST LIFT AT TDC IMPERIAL:
- 0.139'
- TYPE:
- BOLT-IN
- UNITS:
- EACH
- EXHAUST OPEN IMPERIAL:
- 61°
- PRODUCT NAME:
- CAM
- EXHAUST DURATION IMPERIAL:
- 252°
- EXHAUST LIFT IMPERIAL:
- 0.472'
- INTAKE DURATION IMPERIAL:
- 246°
- INTAKE CLOSE IMPERIAL:
- 49°
- INTAKE LIFT AT TDC IMPERIAL:
- 0.163'
- INTAKE LIFT IMPERIAL:
- 0.472'
- INTAKE OPEN IMPERIAL:
- 18°
- MODEL:
- 246A
- RIDING STYLE:
- STREET
$425.95Qty in Cart: 0Quantity:Price:$425.95Subtotal: -
COMP CAMS Mega 8 Cam - M8 307-500-9
COMP CAMS
$417.95If you're looking to unlock your M8's potential, the COMP Cams Mega 8 is engineered to deliver the torque and horsepower your riding style demands—whether that's stable cruising on long tours or peak...09251224- SKU:
- 09251224
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- EXHAUST CLOSE IMPERIAL:
- 14°
- EXHAUST DURATION IMPERIAL:
- 250°
- EXHAUST OPEN IMPERIAL:
- 56°
- INTAKE CLOSE IMPERIAL:
- 42°
- PRODUCT NAME:
- CAM
- UNITS:
- EACH
- INTAKE DURATION IMPERIAL:
- 240°
- INTAKE LIFT AT TDC IMPERIAL:
- 0.172'
- INTAKE OPEN IMPERIAL:
- 18°
- RIDING STYLE:
- STREET
- EXHAUST LIFT AT TDC IMPERIAL:
- 0.145'
- INTAKE LIFT IMPERIAL:
- 0.522'
- TYPE:
- HIGH-LIFT
- EXHAUST LIFT IMPERIAL:
- 0.485'
- MODEL:
- 240C
$417.95Qty in Cart: 0Quantity:Price:$417.95Subtotal: -
COMP CAMS Chain Drive Cam Set TC-3104
COMP CAMS
$370.95The COMP Cams Chain Drive Cam Set TC-3104 delivers the performance gains you're after without sacrificing engine longevity—a rare combination in high-output cam profiles. Its Endurance Ramp lobe...09251092- SKU:
- 09251092
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- EXHAUST CLOSE IMPERIAL:
- 17°
- EXHAUST LIFT IMPERIAL:
- 0.590'
- EXHAUST OPEN IMPERIAL:
- 61°
- INTAKE DURATION IMPERIAL:
- 250°
- INTAKE OPEN IMPERIAL:
- 20°
- TYPE:
- CHAIN
- INTAKE CLOSE IMPERIAL:
- 50°
- UNITS:
- PAIR
- PRODUCT NAME:
- CAM KIT
- RIDING STYLE:
- STREET
- EXHAUST DURATION IMPERIAL:
- 258°
- INTAKE LIFT IMPERIAL:
- 0.590'
$370.95Qty in Cart: 0Quantity:Price:$370.95Subtotal: -
On Sale
EASTERN MOTORCYCLE PARTS Crankcase Roller Bearings A-9265-12
EASTERN MOTORCYCLE PARTS
MSRP: $14.95Now: $13.60Was: $14.95Crankcase roller bearings are critical to maintaining precise crankshaft alignment and minimizing rotational friction in your engine. A worn or damaged bearing directly impacts power delivery,...09500331- SKU:
- 09500331
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- SIZE:
- OVERSIZE (+0,0008')
- SIZE IMPERIAL:
- OVERSIZE (+0.0008')
- RIDING STYLE:
- STREET
- TYPE:
- ROLLER
- UNITS:
- 12 PACK
- PRODUCT NAME:
- BEARING
MSRP: $14.95Now: $13.60Was: $14.95 -
On Sale
EASTERN MOTORCYCLE PARTS Right Case Bushing A-24599-40
EASTERN MOTORCYCLE PARTS
MSRP: $124.95Now: $113.70Was: $124.95A worn or damaged case bushing compromises your motorcycle's structural integrity and can lead to misalignment issues that affect engine performance and longevity. This OEM-specification Eastern...09500335- SKU:
- 09500335
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- SIZE:
- STANDARD
- MOUNTING POSITION:
- RIGHT
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
MSRP: $124.95Now: $113.70Was: $124.95 -
On Sale
EASTERN MOTORCYCLE PARTS Right Bearing Washer A-24692-58
EASTERN MOTORCYCLE PARTS
Now: $12.19Was: $13.40Bearing washers are critical wear components that maintain proper axle endplay and protect bearing races from lateral forces. This OEM-spec washer ensures your motorcycle's wheel bearings seat...09500363- SKU:
- 09500363
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- MOUNTING POSITION:
- RIGHT
- TYPE:
- CRANKCASE BEARING
- UNITS:
- 5 PACK
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
Now: $12.19Was: $13.40 -
On Sale
Jims Oil Pump Idler Gear for 1984-1998 Harley-Davidson Big Twin 26317-68A
JIMS
MSRP: $58.95Now: $53.06Was: $58.95Your Big Twin's oil system is only as reliable as its weakest component—and the stock idler gear is often the first to wear. The JIMS Oil Pump Idler Gear replaces that worn or failing component with...DS197040- SKU:
- DS197040
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GEAR
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- IDLER
- TYPE:
- OIL PUMP
MSRP: $58.95Now: $53.06Was: $58.95Qty in Cart: 0Quantity:Price:MSRP: $58.95Now: $53.06Was: $58.95Subtotal: -
On Sale
Jims Cam Cover Bushing for Harley-Davidson Big Twin 1936-1969 25581-36
JIMS
MSRP: $36.90Now: $33.21Was: $36.90The cam cover bushing is a critical wear point in vintage Big Twin engines—factory originals wear out, causing excessive play and oil seepage that compounds into bigger problems. This JIMS bushing...DS197068- SKU:
- DS197068
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- DIAMETER IMPERIAL:
- 1.0035'
- TYPE:
- CAM COVER
- UNITS:
- EACH
- MATERIAL:
- BRONZE
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
MSRP: $36.90Now: $33.21Was: $36.90 -
On Sale
Jims Cam Cover Bushing for Harley-Davidson Big Twin 1970-1999 25581-70
JIMS
MSRP: $39.35Now: $35.42Was: $39.35Cam cover bushings wear down from constant cycling, leading to oil leaks and potential engine damage. This JIMS bronze bushing restores a precision fit to your Big Twin's cam cover, eliminating play...DS197069- SKU:
- DS197069
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- BRONZE
- PRODUCT NAME:
- BUSHING
- SIZE IMPERIAL:
- 1.2015'
- TYPE:
- CAM COVER
- UNITS:
- EACH
MSRP: $39.35Now: $35.42Was: $39.35
