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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KIBBLEWHITE Valve Seat 10-HC518
KIBBLEWHITE
$14.47If you're running titanium valves in a high-performance engine, valve seat material directly impacts durability, thermal management, and overall reliability. The KIBBLEWHITE 10-HC518 is engineered to handle the extreme demands of racing applications,...09263362- SKU:
- 09263362
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 1.700'
- OUTSIDE DIAMETER IMPERIAL:
- 2.040'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
- RIDING STYLE:
- STREET
$14.47 -
KIBBLEWHITE Valve Seat 10-HC525
KIBBLEWHITE
$14.47If you're running titanium valves in a high-performance engine, your valve seats need to match that precision—and OEM seats simply won't cut it. KIBBLEWHITE's copper-based HC525 seats deliver the thermal management and wear resistance required for...09263363- SKU:
- 09263363
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 1.750'
- OUTSIDE DIAMETER IMPERIAL:
- 2.163'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
- RIDING STYLE:
- STREET
$14.47 -
KB PERFORMANCE Forged Piston Kit - Twin Cam KB660C.005
KB PERFORMANCE
$307.29If you're rebuilding a Twin Cam engine or pushing past stock performance limits, piston quality directly impacts reliability, longevity, and power output. KB Performance's forged 4032 aluminum pistons are engineered for the demands of high-rpm operation,...09103971- SKU:
- 09103971
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.875'
- BORE - OVERSIZE:
- +0,005'
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
$307.29Qty in Cart: 0Quantity:Price:$307.29Subtotal: -
KB PERFORMANCE Super-Duty Piston KB660LCA.STD
KB PERFORMANCE
$390.86Piston rock and ring flutter cost you horsepower and durability. The KB PERFORMANCE Super-Duty Piston KB660LCA.STD eliminates both through a proprietary skirt coating that self-hones to perfect cylinder clearance at startup, delivering zero piston slap...09105045- SKU:
- 09105045
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- UNITS:
- KIT
- BORE SIZE METRIC:
- 98.40 MM
- DISPLACEMENT:
- 103'
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH IMPERIAL:
- 4-3/8'
$390.86 -
KB PERFORMANCE Super-Duty Piston KB662LCA.010
KB PERFORMANCE
$390.86Piston rock and ring flutter are silent killers of engine efficiency and longevity. The KB PERFORMANCE Super-Duty Piston KB662LCA.010 eliminates both through an innovative skirt coating that self-hones to perfect clearance on startup, delivering optimal...09105050- SKU:
- 09105050
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE SIZE METRIC:
- 104.80 MM
- DISPLACEMENT:
- 117'
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
$390.86 -
JAMES GASKET Clutch Derby Cover Gasket 25416-14
JAMES GASKET
$49.40A quality clutch derby cover gasket is essential for preventing oil leaks and maintaining proper engine sealing on your motorcycle. The JAMES GASKET Clutch Derby Cover Gasket 25416-14 delivers reliable performance with precision engineering, ensuring a...09345379- SKU:
- 09345379
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
$49.40 -
JAMES GASKET Cylinder Head Gasket - M8 JGI-16500326
JAMES GASKET
$34.00A cylinder head gasket is the critical seal between your engine block and cylinder head—any compromise here means oil leaks, coolant seepage, and catastrophic compression loss. The JAMES GASKET M8 is engineered for Harley-Davidson M8 engines, delivering...09345963- SKU:
- 09345963
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- 5 PACK
$34.00 -
JAMES GASKET Cylinder Base Gasket - M8 JGI-16500332
JAMES GASKET
$35.95A failing cylinder base gasket compromises compression, invites oil seepage, and creates inconsistent combustion—all of which tank your engine's reliability and performance. The JAMES GASKET Cylinder Base Gasket for M8 applications delivers OEM-quality...09345964- SKU:
- 09345964
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
$35.95 -
JAMES GASKET Lifter Cover Gasket - M8 JGI-25700362
JAMES GASKET
$12.95A worn or failing lifter cover gasket compromises engine sealing, leading to oil leaks that accelerate wear on critical components and create unwanted mess in your engine bay. JAMES GASKET's M8 lifter cover gasket delivers OEM-equivalent sealing...09345965- SKU:
- 09345965
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- TAPPET BLOCK
- UNITS:
- PAIR
$12.95 -
JAMES GASKET Piston Squirter Gasket - M8 JGI-25700433
JAMES GASKET
$17.10Piston squirters are critical to engine longevity, delivering precisely controlled oil spray to the underside of pistons for superior cooling and reduced friction during high-RPM operation. A failing or worn gasket compromises this crucial lubrication...09345967- SKU:
- 09345967
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- 10 PACK
- TYPE:
- OIL JET ASSEMBLY
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$17.10 -
JAMES GASKET Cam Cover Gasket - M8 JGI-25700370
JAMES GASKET
$39.70A leaking cam cover gasket compromises engine sealing and invites oil contamination into your combustion chamber—a guaranteed path to performance loss and engine wear. The JAMES GASKET Cam Cover Gasket for M8 engines delivers OEM-grade sealing...09345968- SKU:
- 09345968
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- TYPE:
- CAM COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$39.70 -
JAMES GASKET Air Cleaner Gasket - M8 JGI-29000149
JAMES GASKET
$8.00A worn or damaged air cleaner gasket compromises your engine's intake seal, allowing unfiltered air to bypass your filtration system and potentially introducing contaminants into the combustion chamber. This JAMES GASKET replacement restores a proper...09345969- SKU:
- 09345969
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- AIR FILTER
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$8.00 -
Hastings HASTINGS Piston Rings - XL 7003
HASTINGS
$74.95Piston rings are critical to maintaining compression, controlling blow-by, and managing oil consumption—and worn or inferior rings will compromise engine performance and longevity across the board. The Hastings HASTINGS Piston Rings XL 7003 deliver the...DS750610- SKU:
- DS750610
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- STYLE:
- OEM REPLACEMENT
- BORE SIZE IMPERIAL:
- 3.1875'
- RING MATERIAL:
- MOLY COATED
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
$74.95 -
Hastings HASTINGS Piston Rings - XL 7003020
HASTINGS
$74.95Piston rings are critical to engine performance—they seal combustion pressure, regulate oil consumption, and directly impact horsepower and longevity. Hastings piston rings are engineered to tighter tolerances and use premium materials that resist...DS750612- SKU:
- DS750612
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- RING MATERIAL:
- MOLY COATED
- BORE - OVERSIZE:
- +0,020'
- PRODUCT NAME:
- PISTON RING
- STYLE:
- OEM REPLACEMENT
- BORE SIZE IMPERIAL:
- 3.207'
- RIDING STYLE:
- STREET
- UNITS:
- SET
$74.95Qty in Cart: 0Quantity:Price:$74.95Subtotal: -
Hastings HASTINGS Piston Rings - XL 7003030
HASTINGS
$74.95Piston rings are critical to engine sealing, compression, and oil control—and worn or substandard rings will tank your engine's performance and longevity. Hastings piston rings are engineered to exacting standards with proven materials and designs...DS750613- SKU:
- DS750613
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 3.217'
- RING MATERIAL:
- MOLY COATED
- BORE - OVERSIZE:
- +0,030'
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- STYLE:
- OEM REPLACEMENT
$74.95 -
Hastings HASTINGS Piston Rings - Shovelhead 6482
HASTINGS
$56.95Piston rings are critical wear items that directly impact engine compression, blow-by control, and oil consumption—especially in high-performance Shovelhead applications where reliability demands precision. The Hastings 6482 ring set combines proven ring...DS750620- SKU:
- DS750620
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 3.437'
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- STYLE:
- OEM REPLACEMENT
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
- RING MATERIAL:
- CAST
$56.95 -
Hastings HASTINGS Piston Rings - Shovelhead 6482010
HASTINGS
$56.95Piston rings are critical to engine longevity—they seal combustion pressure, regulate oil consumption, and maintain compression integrity. Hastings rings are engineered to exacting tolerances, delivering reliable performance and extended ring life in...DS750621- SKU:
- DS750621
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- SET
- BORE - OVERSIZE:
- +0,010'
- PRODUCT NAME:
- PISTON RING
- RING MATERIAL:
- CAST
- STYLE:
- OEM REPLACEMENT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- BORE SIZE IMPERIAL:
- 3.447'
- RIDING STYLE:
- STREET
$56.95 -
Hastings HASTINGS Piston Rings - Shovelhead 6482020
HASTINGS
$56.95Hastings piston rings are engineered to restore compression and oil control in your Shovelhead engine, directly impacting power delivery and longevity. A worn ring set compromises combustion efficiency and accelerates engine wear—replacing them with...DS750622- SKU:
- DS750622
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- BORE - OVERSIZE:
- +0,020'
- BORE SIZE IMPERIAL:
- 3.457'
- PRODUCT NAME:
- PISTON RING
- RING MATERIAL:
- CAST
- STYLE:
- OEM REPLACEMENT
- RIDING STYLE:
- STREET
- UNITS:
- SET
$56.95 -
Hastings HASTINGS Piston Rings - Shovelhead 6482030
HASTINGS
$56.95Worn or damaged piston rings kill engine efficiency and power output—this Hastings ring set restores proper compression and oil control for consistent Shovelhead performance. Whether you're rebuilding after high mileage or maintaining race reliability,...DS750623- SKU:
- DS750623
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 3.467'
- BORE - OVERSIZE:
- +0,030'
- PRODUCT NAME:
- PISTON RING
- RING MATERIAL:
- CAST
- STYLE:
- OEM REPLACEMENT
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- RIDING STYLE:
- STREET
- UNITS:
- SET
$56.95 -
Hastings HASTINGS Piston Rings - Shovelhead 6482040
HASTINGS
$56.95Worn or damaged piston rings compromise compression, increase blowby, and waste fuel—directly killing your engine's performance and reliability. The Hastings 6482040 ring set restores proper sealing and combustion efficiency in your Shovelhead,...DS750624- SKU:
- DS750624
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.040'
- BORE - OVERSIZE:
- +0,040'
- BORE SIZE IMPERIAL:
- 3.477'
- RIDING STYLE:
- STREET
- RING MATERIAL:
- CAST
- STYLE:
- OEM REPLACEMENT
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$56.95Qty in Cart: 0Quantity:Price:$56.95Subtotal:
