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 Spring Kit - Twin Cam/XL 20-20364
KIBBLEWHITE
$142.97If you're pushing your Twin Cam or XL engine toward maximum valve lift, cam timing precision becomes non-negotiable—and inferior springs will cost you performance and reliability. The KIBBLEWHITE Spring Kit delivers the consistent, predictable valve...09260184- SKU:
- 09260184
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- SPRING LIFT IMPERIAL:
- 0.600'
- TYPE:
- VALVE
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- COLLAR MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- SPRING LIFT:
- 0,600'
- SPRING OPEN PRESSURE:
- 347 LB
- SPRING SEAT PRESSURE:
- 150 LB
$142.97 -
KIBBLEWHITE Intake Valve - Twin Cam 20-20322
KIBBLEWHITE
$37.55Twin-cam engines demand intake valves engineered to withstand extreme combustion pressures while maintaining precise clearances—this Kibblewhite valve delivers both through a nitrided stainless-steel construction that outperforms standard hard-chrome...09260193- SKU:
- 09260193
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2754'
- UNITS:
- EACH
- HEAD DIAMETER IMPERIAL:
- 1.805'
- LENGTH IMPERIAL:
- 4.420'
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- STREET
- TULIP ANGLE:
- 1,7' R
- TULIP ANGLE IMPERIAL:
- 1.7° R
$37.55 -
KIBBLEWHITE Intake Valve - Twin Cam 20-20323R
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, throttle response, and engine longevity. The KIBBLEWHITE 20-20323R delivers precision-engineered reliability through a nitrided, stellite-tipped construction that outperforms conventional...09260194- SKU:
- 09260194
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2754'
- UNITS:
- EACH
- HEAD DIAMETER IMPERIAL:
- 1.900'
- LENGTH IMPERIAL:
- 4.420'
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- STREET
- TULIP ANGLE:
- 28°
$37.55 -
KIBBLEWHITE Exhaust Valve - Twin Cam 20-20325
KIBBLEWHITE
$37.55Exhaust valves endure extreme thermal and mechanical stress—inferior materials fail under sustained high RPM operation, causing compression loss and increased wear. The KIBBLEWHITE 20-20325 combines stainless-steel construction with a stellite tip and...09260195- SKU:
- 09260195
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- LENGTH IMPERIAL:
- 4.520'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.2754'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER IMPERIAL:
- 1.575'
- MODEL:
- BLACK DIAMOND™
- RIDING STYLE:
- STREET
- TULIP ANGLE:
- 22°
$37.55 -
KIBBLEWHITE Exhaust Valve - Twin Cam 20-20326R
KIBBLEWHITE
$37.55Exhaust valves are mission-critical components that directly impact cylinder sealing, heat rejection, and overall engine longevity. The KIBBLEWHITE 20-20326R delivers superior wear resistance and reduced friction through a proprietary nitriding process,...09260196- SKU:
- 09260196
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- STREET
- TULIP ANGLE:
- 34°
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- HEAD DIAMETER IMPERIAL:
- 1.630'
- LENGTH IMPERIAL:
- 4.520'
- STEM DIAMETER IMPERIAL:
- 0.2754'
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Valve Seat 10-HC440
KIBBLEWHITE
$14.47If you're running titanium valves in a high-performance engine, your valve seats need to keep up—and that's exactly what KIBBLEWHITE's copper-based design delivers. These seats excel at heat dissipation and wear resistance, proven through years of R&D...09263355- SKU:
- 09263355
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- INSIDE DIAMETER METRIC:
- 35.81 MM
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 1.732'
- PRODUCT NAME:
- VALVE SEAT
- RIDING STYLE:
- STREET
$14.47 -
KIBBLEWHITE Valve Seat 10-HC447
KIBBLEWHITE
$14.47If you're running titanium valves in a high-performance engine, valve seat material directly impacts durability, thermal management, and longevity under extreme conditions. KIBBLEWHITE's copper-based seats were engineered over two years specifically for...09263358- SKU:
- 09263358
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- OUTSIDE DIAMETER IMPERIAL:
- 1.757'
- RIDING STYLE:
- STREET
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER METRIC:
- 35.81 MM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
$14.47 -
KIBBLEWHITE Valve Seat 10-HC478
KIBBLEWHITE
$14.47If you're running titanium valves in a high-performance engine, you need a seat that can handle the thermal stress and maintain precise sealing over thousands of heat cycles. KIBBLEWHITE's copper-based valve seats were engineered specifically for this...09263359- SKU:
- 09263359
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- INSIDE DIAMETER METRIC:
- 38.61 MM
- OUTSIDE DIAMETER IMPERIAL:
- 1.882'
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
- APPLICATION:
- EXHAUST
$14.47 -
KIBBLEWHITE Valve Seat 10-HC493
KIBBLEWHITE
$14.47If you're running titanium valves in a high-performance engine, valve seat material directly impacts thermal stability, longevity, and reliability under extreme conditions. KIBBLEWHITE's copper-based seats are engineered specifically for titanium valve...09263360- SKU:
- 09263360
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER IMPERIAL:
- 1.944'
- PRODUCT NAME:
- VALVE SEAT
- INSIDE DIAMETER METRIC:
- 40.01 MM
$14.47 -
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
$322.95If 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
$322.95Qty in Cart: 0Quantity:Price:$322.95Subtotal: -
KB PERFORMANCE Super-Duty Piston KB660LCA.STD
KB PERFORMANCE
$410.95Piston 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'
$410.95Qty in Cart: 0Quantity:Price:$410.95Subtotal: -
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
