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
-
K & N Oil Filter - Black - Buell KN-177
K & N
$17.99K&N delivers a premium oil filter which is built with a synthetic media specifically designed to withstand the high concentrates of synthetic racing oils, A large filter media provides high-flow rates and outstanding oil filtration to keep your motor...07120045- SKU:
- 07120045
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- BASE FINISH:
- COATED
- RIDING STYLE:
- STREET
- STYLE:
- PREMIUM
- COLOR/FINISH:
- BLACK
- FEATURES:
- INCLUDES NUT
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- LENGTH METRIC:
- 75 MM
- TYPE:
- SPIN-ON
$17.99 -
K & N Oil Filter - Black - Twin Cam KN-171B
K & N
$17.99K&N delivers a premium oil filter which is built with a synthetic media specifically designed to withstand the high concentrates of synthetic racing oils, A large filter media provides high-flow rates and outstanding oil filtration to keep your motor...KN171B- SKU:
- KN171B
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- FEATURES:
- INCLUDES NUT
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- RIDING STYLE:
- STREET
- BASE FINISH:
- COATED
- MODEL:
- WRENCH-OFF
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- PREMIUM
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 94 MM
$17.99 -
K & N Oil Filter - Chrome - Twin Cam KN-171C
K & N
$19.99K&N delivers a premium oil filter which is built with a synthetic media specifically designed to withstand the high concentrates of synthetic racing oils, A large filter media provides high-flow rates and outstanding oil filtration to keep your motor...KN171C- SKU:
- KN171C
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- TYPE:
- SPIN-ON
- BASE COLOR:
- SILVER
- LENGTH METRIC:
- 94 MM
- BASE FINISH:
- CHROME
- FEATURES:
- INCLUDES NUT
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
$19.99 -
ULTRACOOL Fairing Mount Oil Cooler Kit - Black SMT-4
ULTRACOOL
$549.99Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when oil reaches 210 degrees, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation, Sealed Waterproof IP68 Dual...07130225- SKU:
- 07130225
- Availability:
- Ships Same Business Day
- Weight:
- 5.26 LBS
- BASE COLOR:
- BLACK
- MOUNTING POSITION:
- LOWER FAIRING
- PRODUCT NAME:
- OIL COOLER
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
$549.99 -
ULTRACOOL Oil Cooler Kit - Black SMT8-3
ULTRACOOL
$549.99Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when oil reaches 210 degrees, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation, Sealed Waterproof IP68 Dual...07130226- SKU:
- 07130226
- Availability:
- Ships Same Business Day
- Weight:
- 4.51 LBS
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
- MOUNTING POSITION:
- LOWER FAIRING
- PRODUCT NAME:
- OIL COOLER
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
$549.99 -
ULTRACOOL Below Regulator Mount Oil Cooler- Gloss Black RF-2GSS
ULTRACOOL
$549.99Specifically designed for the T series S&S 111, 124 and 143 engines, Includes a special machined adapter to fit perfectly into the S&S cases, Will not fit with water cooled heads07130247- SKU:
- 07130247
- Availability:
- Ships Same Business Day
- Weight:
- 3.59 LBS
- BASE FINISH:
- GLOSS
- UNITS:
- KIT
- COLOR/FINISH:
- GLOSS BLACK
- PRODUCT NAME:
- OIL COOLER
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- MOUNTING POSITION:
- BELOW REGULATOR
$549.99 -
ULTRACOOL Below Regulator Mount Oil Cooler- Flat Black RF-2FSS
ULTRACOOL
$549.99Specifically designed for the T series S&S 111, 124 and 143 engines, Includes a special machined adapter to fit perfectly into the S&S cases, Will not fit with water cooled heads07130248- SKU:
- 07130248
- Availability:
- Ships Same Business Day
- Weight:
- 3.63 LBS
- BASE COLOR:
- BLACK
- BASE FINISH:
- FLAT
- COLOR/FINISH:
- FLAT BLACK
- MOUNTING POSITION:
- BELOW REGULATOR
- PRODUCT NAME:
- OIL COOLER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$549.99Qty in Cart: 0Quantity:Price:$549.99Subtotal: -
ULTRACOOL Side Mount Oil Cooler - Black SMT-2GSS
ULTRACOOL
$589.99Sealed waterproof IP68 fans produce 220 CFM of airflow, Oil adapter and thermal switch automatically turns on the dual fans when your oil reaches 210°F, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation,...07130250- SKU:
- 07130250
- Availability:
- Ships Same Business Day
- Weight:
- 7.81 LBS
- MOUNTING POSITION:
- SIDE MOUNT
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- UNITS:
- KIT
- BASE COLOR:
- BLACK
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- OIL COOLER
$589.99 -
ULTRACOOL Oil Cooler Kit - Chrome RF-1SS
ULTRACOOL
$549.99Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when oil reaches 210 degrees, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation, Sealed Waterproof IP68 Dual...07130146- SKU:
- 07130146
- Availability:
- Ships Same Business Day
- Weight:
- 7.31 LBS
- MOUNTING POSITION:
- CENTER MOUNT
- PRODUCT NAME:
- OIL COOLER
- UNITS:
- KIT
- COLOR/FINISH:
- CHROME
- MOUNTING POSITION:
- BELOW REGULATOR
- RIDING STYLE:
- STREET
- BASE FINISH:
- NATURAL
$549.99 -
ULTRACOOL Oil Cooler Kit - Black RF-1G
ULTRACOOL
$549.99Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when oil reaches 210 degrees, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation, Sealed Waterproof IP68 Dual...07130147- SKU:
- 07130147
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- BASE COLOR:
- BLACK
- MOUNTING POSITION:
- BELOW REGULATOR
- COLOR/FINISH:
- GLOSS BLACK
- PRODUCT NAME:
- OIL COOLER
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- CENTER MOUNT
- UNITS:
- KIT
$549.99 -
ULTRACOOL Oil Cooler Kit - Flat Black RF-1F
ULTRACOOL
$499.00Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when oil reaches 210 degrees, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation, Sealed Waterproof IP68 Dual...07130148- SKU:
- 07130148
- Availability:
- Ships Same Business Day
- Weight:
- 7.45 LBS
- MOUNTING POSITION:
- CENTER MOUNT
- PRODUCT NAME:
- OIL COOLER
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- FLAT BLACK
- MOUNTING POSITION:
- BELOW REGULATOR
- UNITS:
- KIT
- BASE FINISH:
- FLAT
- RIDING STYLE:
- STREET
$499.00Qty in Cart: 0Quantity:Price:$499.00Subtotal: -
ULTRACOOL Oil Cooler Kit - Chrome RF-2SS
ULTRACOOL
$549.99Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when oil reaches 210 degrees, Specially designed aluminum heat exchanger with turbulators for maximum heat dissipation, Sealed Waterproof IP68 Dual...07130149- SKU:
- 07130149
- Availability:
- Ships Same Business Day
- Weight:
- 7.50 LBS
- BASE FINISH:
- NATURAL
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- MOUNTING POSITION:
- BELOW REGULATOR
- UNITS:
- KIT
- MOUNTING POSITION:
- CENTER MOUNT
- PRODUCT NAME:
- OIL COOLER
$549.99 -
On Sale
Wiseco Piston Kit 1984-1998 Harley-Davidson FLHR Road King K1666
WISECO
MSRP: $447.95Now: $348.00Was: $447.95If you're rebuilding a Big Twin engine or planning an overbore, you need pistons engineered to handle sustained performance without compromising reliability. The Wiseco K1666 Kit delivers precision-forged components and complete gasket coverage,...K1666- SKU:
- K1666
- Availability:
- Ships Same Business Day
- Weight:
- 2.63 LBS
- DISPLACEMENT:
- 1345 CC
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +0,010'
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 3.508'
- UNITS:
- EACH
MSRP: $447.95Now: $348.00Was: $447.95 -
On Sale
Wiseco Piston Kit 1998 Harley-Davidson FLHRI Road King K1667
WISECO
MSRP: $447.95Now: $348.00Was: $447.95Whether you're planning a full top-end rebuild or pushing your Big Twin into overbore territory, the Wiseco K1667 Piston Kit delivers the precision engineering needed to sustain increased compression and power output. This complete solution eliminates...K1667- SKU:
- K1667
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +0,020'
- DISPLACEMENT:
- 1353 CC
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- BORE SIZE IMPERIAL:
- 3.518'
- TYPE:
- TOP END
- UNITS:
- EACH
MSRP: $447.95Now: $348.00Was: $447.95 -
On Sale
Wiseco 1988-2003 Harley-Davidson XLH1200 Sportster 1200 Piston Kit K1687
WISECO
MSRP: $409.95Now: $348.00Was: $409.95A worn or damaged piston compromises compression, power delivery, and engine longevity—making a quality rebuild kit essential for any serious Sportster owner. The Wiseco K1687 delivers OEM-equivalent performance with forged construction that handles...K1687- SKU:
- K1687
- Availability:
- Ships Same Business Day
- Weight:
- 2.38 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- DISPLACEMENT:
- 1200 CC
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,020'
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 3.498'
- UNITS:
- EACH
MSRP: $409.95Now: $348.00Was: $409.95Qty in Cart: 0Quantity:Price:MSRP: $409.95Now: $348.00Was: $409.95Subtotal: -
On Sale
COVINGTONS Points Cover - Chrome - M8 C1896-B
COVINGTONS
MSRP: $77.95Now: $50.00Was: $77.95A points cover isn't just cosmetic—it protects your ignition system from dirt, moisture, and debris while maintaining the clean aesthetic your engine deserves. This Covington cover delivers genuine billet construction with a mirror-polished chrome finish...09402002- SKU:
- 09402002
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- TYPE:
- POINTS
- PRODUCT NAME:
- COVER
- STYLE:
- RIPPER
- UNITS:
- EACH
MSRP: $77.95Now: $50.00Was: $77.95 -
COVINGTONS Rocker Box Cover - Chrome - Twin Cam C1283-C
COVINGTONS
$1,140.95Your Twin Cam engine deserves finishes that match its performance. COVINGTONS Rocker Box Covers deliver the polished aesthetics your build demands while protecting critical engine components from dust, debris, and the elements. CNC-machined from billet...09401055- SKU:
- 09401055
- Availability:
- Ships Same Business Day
- Weight:
- 11.85 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- STYLE:
- SMOOTH
- UNITS:
- PAIR
- MOUNTING POSITION:
- FRONT
- TYPE:
- ROCKER BOX
- MATERIAL:
- BILLET ALUMINUM
$1,140.95 -
COVINGTONS Rocker Box Cover - Chrome - Twin Cam C1282-C
COVINGTONS
$1,140.95A rocker box cover isn't just cosmetic—it protects your Twin Cam's internal components from debris and moisture while giving your engine bay a finished appearance that reflects your attention to detail. COVINGTONS delivers this protection without...09400748- SKU:
- 09400748
- Availability:
- Ships Same Business Day
- Weight:
- 8.84 LBS
- COLOR/FINISH:
- CHROME
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING POSITION:
- FRONT
- PRODUCT NAME:
- COVER
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- STYLE:
- FINNED
- TYPE:
- ROCKER BOX
$1,140.95 -
COVINGTONS Rocker Box Cover - Dimpled Black - Twin Cam C1292-B
COVINGTONS
$823.95The COVINGTONS Rocker Box Cover delivers a clean, finished look while protecting critical top-end components from contamination and debris. CNC-machined from billet aluminum, this cover meets OEM specifications without compromising durability or...09401356- SKU:
- 09401356
- Availability:
- Ships Same Business Day
- Weight:
- 5.85 LBS
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- MOUNTING POSITION:
- FRONT
- TYPE:
- ROCKER BOX
- COLOR/FINISH:
- BLACK
- STYLE:
- DIMPLED
- UNITS:
- PAIR
$823.95 -
On Sale
Belt Drives Ltd Cam Cover Conversion Kit for Harley-Davidson Twin Cam 1999-2006 BDL-CC-100
BELT DRIVES LTD.
MSRP: $950.95Now: $855.86Was: $950.95If you're running a Twin Cam engine in a custom build and want the simplicity and reliability of Evolution-style ignition electronics, this conversion kit eliminates the complexity of your current system while maintaining full compatibility with...09400863- SKU:
- 09400863
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- TYPE:
- CAM
- COLOR/FINISH:
- POLISHED
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
MSRP: $950.95Now: $855.86Was: $950.95
