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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EASTERN MOTORCYCLE PARTS Bearing - Red A-24650-87
EASTERN MOTORCYCLE PARTS
$45.95Precision-engineered bearings are critical to maintaining smooth, reliable operation in high-demand motorcycle applications. The EASTERN MOTORCYCLE PARTS A-24650-87 delivers OEM-equivalent...09240266- SKU:
- 09240266
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- PINION SHAFT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- STREET
- TYPE:
- ROLLER
- UNITS:
- EACH
$45.95 -
EASTERN MOTORCYCLE PARTS Rod Bearings - .0006" B-LATE-4-RS
EASTERN MOTORCYCLE PARTS
$18.95Precision rod bearings are the foundation of engine reliability—they directly impact oil film strength, bearing clearance, and overall crankshaft stability under load. The Eastern Motorcycle Parts...09240196- SKU:
- 09240196
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- APPLICATION:
- CONNECTING ROD
- PRODUCT NAME:
- BEARING
- OUTSIDE DIAMETER IMPERIAL:
- OVERSIZE (+0.0006')
- RIDING STYLE:
- STREET
- UNITS:
- SET
- TYPE:
- ROLLER
$18.95 -
EASTERN MOTORCYCLE PARTS Sprocket Shaft Spacer Softail A-24039-01A
EASTERN MOTORCYCLE PARTS
$45.95A worn or damaged sprocket shaft spacer compromises chain alignment and accelerates wear on your drivetrain components. This Eastern Motorcycle Parts spacer ensures precise spacing and concentricity,...09500229- SKU:
- 09500229
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- SHAFT SPACER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- SPROCKET
$45.95 -
Wiseco Piston Kit 1999-2006 Harley-Davidson Road King FLHR VT2721
WISECO
$659.95A worn or damaged top end can rob your Road King of performance and reliability. The Wiseco Piston Kit VT2721 gives you everything needed for a complete, quality rebuild—high-silicon forged pistons...09030793- SKU:
- 09030793
- Availability:
- Ships Same Business Day
- Weight:
- 4.01 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- BORE SIZE IMPERIAL:
- 3.875'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- DISPLACEMENT:
- 1554 CC
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,010'
- STROKE LENGTH IMPERIAL:
- 4'
$659.95Qty in Cart: 0Quantity:Price:$659.95Subtotal: -
Wiseco Piston Kit 114ci 2017-2021 Harley-Davidson K2785
WISECO
$576.95If you're pushing your M8 to its limits, stock pistons won't cut it. The Wiseco K2785 kit is engineered for sustained high-rpm performance and reliability when it matters most—delivering a 11:1...09031552- SKU:
- 09031552
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- BORE SIZE IMPERIAL:
- 4.080'
- PISTON HEAD SHAPE:
- DOMED
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.143'
- DISPLACEMENT:
- 1875 CC
- PISTON MATERIAL:
- ARMORX™
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- BORE - OVERSIZE:
- +0,143'
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
$576.95 -
Wiseco Piston Kit 117ci 11:1 Compression for Harley-Davidson FLHTKL 2017-2019 K2799
WISECO
$576.95If you're building or rebuilding an M8-powered Harley-Davidson, piston quality directly impacts throttle response, reliability, and longevity under load. The Wiseco K2799 delivers the compression...09031553- SKU:
- 09031553
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- BORE - OVERSIZE:
- +0,190'
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- ARMORX™
- UNITS:
- KIT
- PISTON HEAD SHAPE:
- FLAT TOP
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORFIT™
- BORE OVERSIZE - IMPERIAL:
- +0.190'
- BORE SIZE IMPERIAL:
- 4.125'
- DISPLACEMENT:
- 1918 CC
$576.95 -
REVOLUTION PERFORMANCE, LLC Piston Kit RP301-116W
REVOLUTION PERFORMANCE, LLC
$495.95A high-performance piston kit demands precision engineering and materials that can handle extreme combustion pressures without sacrificing reliability. The Revolution Performance RP301-116W delivers...09106372- SKU:
- 09106372
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 107'
- BORE SIZE IMPERIAL:
- 3.937'
- PISTON HEAD SHAPE:
- FLAT TOP
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- COMPRESSION RATIO IMPERIAL:
- 10.1:1
- UNITS:
- KIT
$495.95Qty in Cart: 0Quantity:Price:$495.95Subtotal: -
COMETIC Base Gasket - +4.125" - .010" C9935
COMETIC
$33.55A quality base gasket is critical to maintaining pressure integrity and preventing fuel leakage in your engine's fuel system. The COMETIC C9935 combines a stainless steel core with Viton rubber...09340035- SKU:
- 09340035
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.125'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
$33.55 -
COMETIC Trans Gasket Kit - M8 C10249
COMETIC
$130.15Transmission gasket failure can leave you stranded and cost thousands in rebuild expenses. The COMETIC Trans Gasket Kit M8 C10249 eliminates guesswork by providing factory-engineered sealing...09346334- SKU:
- 09346334
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$130.15Qty in Cart: 0Quantity:Price:$130.15Subtotal: -
COMETIC Cylinder Head Gasket C10167-036
COMETIC
$61.90A quality cylinder head gasket is non-negotiable for reliable combustion sealing and long-term engine integrity. This Cometic gasket handles extreme temperatures, aggressive boost pressures, and...09345925- SKU:
- 09345925
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE:
- 4,145'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.145'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- 2 PACK
$61.90 -
COMETIC Pushtube O-Ring - XL C9956
COMETIC
$50.70Pushrod sealing integrity is critical to engine performance and longevity—even microscopic leaks compromise compression and increase blowby. The COMETIC Pushtube O-Ring XL C9956 delivers the...09340741- SKU:
- 09340741
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- NITRILE RUBBER
- APPLICATION:
- PUSHROD TUBE
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
$50.70Qty in Cart: 0Quantity:Price:$50.70Subtotal: -
COMETIC Primary Gasket Kit C9887
COMETIC
$101.80A quality primary gasket kit is the foundation of a leak-free, reliable engine seal. Cometic's AFM gaskets are engineered for extreme temperatures and high-clamping loads, eliminating the guesswork...09340746- SKU:
- 09340746
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
$101.80 -
COMETIC Tappet Block Gasket - XL C9955
COMETIC
$13.95A failing tappet block gasket compromises oil sealing integrity and can lead to costly leaks that damage surrounding components. The COMETIC Tappet Block Gasket C9955 delivers reliable sealing...09340754- SKU:
- 09340754
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- TYPE:
- TAPPET BLOCK
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- PAIR
$13.95 -
COMETIC Shifter Shaft O-Ring C9252
COMETIC
$9.30A failing shifter shaft o-ring compromises your transmission's seal integrity, leading to fluid leaks and potential internal damage. The COMETIC C9252 delivers the reliability you need for consistent...09350278- SKU:
- 09350278
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- APPLICATION:
- STARTER SHAFT
- MATERIAL:
- BUNA
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$9.30Qty in Cart: 0Quantity:Price:$9.30Subtotal: -
COMETIC Inner Primary O-Ring C9536
COMETIC
$52.30The COMETIC Inner Primary O-Ring C9536 is a critical wear component that prevents fuel and oil seepage in high-performance engine assemblies. Using a premium, fuel-resistant elastomer formulation,...09350261- SKU:
- 09350261
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INNER PRIMARY
- MATERIAL:
- VITON
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- MOTOR
- PRODUCT NAME:
- O-RING
$52.30 -
COMETIC Clutch Cover O-Ring C9220
COMETIC
$28.20A leaking clutch cover gasket compromises engine sealing and invites contamination into critical drivetrain components. The COMETIC Clutch Cover O-Ring C9220 delivers reliable, long-lasting sealing...09350263- SKU:
- 09350263
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CLUTCH COVER
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
$28.20Qty in Cart: 0Quantity:Price:$28.20Subtotal: -
COMETIC Carb to Manifold Seal - 50MM C9227
COMETIC
$7.95A leaking carb-to-manifold seal doesn't just waste fuel—it creates vacuum leaks that compromise idle quality, drivability, and fuel economy. The COMETIC C9227 eliminates guesswork with a precision...09350267- SKU:
- 09350267
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE MANIFOLD TO CARBURETOR
- UNITS:
- EACH
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
$7.95Qty in Cart: 0Quantity:Price:$7.95Subtotal: -
COMETIC Main Drive Gear Seal C9258
COMETIC
$7.40A leaking main drive gear seal can compromise your entire drivetrain, allowing fluid loss that leads to inadequate lubrication and catastrophic gear failure. The COMETIC C9258 is a...09350198- SKU:
- 09350198
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 5 PACK
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$7.40Qty in Cart: 0Quantity:Price:$7.40Subtotal: -
COMETIC Starter Shaft Seal C9528
COMETIC
$8.40A leaking starter shaft seal can silently drain your engine's oil while compromising starter reliability—a critical failure point in high-performance builds. The COMETIC C9528 delivers OEM-quality...09350199- SKU:
- 09350199
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SEAL
- MATERIAL:
- DUAL LIP VITON
- RIDING STYLE:
- STREET
$8.40 -
COMETIC Main Drive Gear Seal C9527
COMETIC
$11.95A compromised main drive gear seal leads to fluid leakage, contamination, and accelerated wear on critical drivetrain components. The COMETIC C9527 is engineered to maintain a reliable, long-lasting...09350200- SKU:
- 09350200
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- MAIN DRIVE GEAR
- STYLE:
- DOUBLE LIP
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
$11.95
