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
-
JAMES GASKET Upper Pushrod O-Ring - Twin Cam 11293
JAMES GASKET
$8.60A failing upper pushrod O-ring compromises cylinder head sealing and can lead to oil leaks that degrade engine performance and reliability. This genuine JAMES GASKET replacement ensures a proper seal on your Twin Cam engine, preventing costly oil loss...DS173210- SKU:
- DS173210
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- OIL FILTER
- PRODUCT NAME:
- O-RING
- APPLICATION:
- UPPER PUSHROD
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- OIL PUMP
- UNITS:
- 10 PACK
$8.60 -
JAMES GASKET Air Cleaner Back Plate O-Ring - Twin Cam 11292
JAMES GASKET
$11.10A compromised air cleaner seal allows unfiltered air to bypass your intake system, degrading combustion efficiency and increasing engine wear. The JAMES GASKET Air Cleaner Back Plate O-Ring restores a proper seal on your Twin Cam, ensuring consistent air...DS173209- SKU:
- DS173209
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- BACK PLATE ASSEMBLY
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CYLINDER HEAD
$11.10 -
JAMES GASKET Manifold Sensor Seal - Twin Cam 11291
JAMES GASKET
$15.60A leaking manifold sensor seal compromises engine diagnostics and can trigger false fault codes that mask real issues. The JAMES GASKET Manifold Sensor Seal maintains a reliable seal between your intake manifold and oxygen sensor, ensuring accurate...DS173208- SKU:
- DS173208
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- MAP SENSOR
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- PRODUCT NAME:
- SEAL
$15.60 -
JAMES GASKET Neutral Sensor O-Ring - Twin Cam 11290
JAMES GASKET
$15.70A worn or deteriorated neutral sensor O-ring can cause erratic neutral position reading, leading to shifting issues and potential transmission problems. This OEM-quality replacement from JAMES GASKET ensures a proper seal at the neutral sensor, restoring...DS173207- SKU:
- DS173207
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$15.70 -
JAMES GASKET Crank Sensor O-Ring - Twin Cam 11289
JAMES GASKET
$3.90A failing crank sensor o-ring compromises engine timing accuracy and fuel delivery precision, leading to rough idle, poor fuel economy, and potential ignition misfires. The JAMES GASKET Crank Sensor O-Ring is engineered to maintain a perfect seal on your...DS173206- SKU:
- DS173206
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- CAM POSITION SENSOR
- UNITS:
- 10 PACK
$3.90 -
JAMES GASKET Cam Position Sensor O-Ring 11288
JAMES GASKET
$9.00A worn or degraded cam position sensor O-ring compromises engine timing accuracy and can trigger diagnostic trouble codes that affect performance and fuel economy. This genuine JAMES GASKET replacement ensures a reliable seal that maintains proper sensor...DS173205- SKU:
- DS173205
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CAM POSITION SENSOR
$9.00Qty in Cart: 0Quantity:Price:$9.00Subtotal: -
JAMES GASKET Case Dowel O-Ring - Twin Cam 11273
JAMES GASKET
$4.00A leaking gasket case dowel compromises engine sealing and invites oil seepage that degrades performance and reliability. The JAMES GASKET Case Dowel O-Ring provides a precision seal at the critical interface where your Twin Cam crankcase meets its...DS173203- SKU:
- DS173203
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- RUBBER
- TYPE:
- DOWEL
- PRODUCT NAME:
- O-RING
$4.00 -
JAMES GASKET Rocker Arm Support O-Ring - Twin Cam 11270
JAMES GASKET
$6.30Rocker arm sealing failures can lead to oil leaks, increased wear, and costly engine damage—especially in high-performance Twin Cam applications where precision matters. The JAMES GASKET Rocker Arm Support O-Ring is engineered to maintain a reliable seal...DS173202- SKU:
- DS173202
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CYLINDER HEAD
- APPLICATION:
- LOWER ROCKER COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- TYPE:
- SUPPORT
- UNITS:
- 10 PACK
$6.30 -
JAMES GASKET Cylinder Base O-Ring - Twin Cam 11256
JAMES GASKET
$20.10A leaking cylinder base gasket compromises engine seal integrity and can lead to oil seepage, reduced performance, and costly engine damage. The JAMES GASKET Cylinder Base O-Ring is engineered to maintain a reliable, leak-free seal on Twin Cam...DS173201- SKU:
- DS173201
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- APPLICATION:
- CYLINDER
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CRANKCASE
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 10 PACK
$20.10 -
COMETIC Rocker Gasket - EST - XL C9764
COMETIC
$65.05Rocker box gaskets experience constant thermal cycling and oil exposure, making them prone to failure and costly leaks if not properly sealed. The COMETIC Rocker Gasket EST XL C9764 delivers a complete, OEM-quality gasket kit engineered to eliminate...DS172076- SKU:
- DS172076
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- EST
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05 -
COMETIC Top End Gasket Kit - XL1200 - EST C9763
COMETIC
$142.75A top-end rebuild demands gaskets engineered to handle extreme combustion pressures and temperature cycling without compromise. The COMETIC EST C9763 kit eliminates the risk of catastrophic gasket failure by actively dissipating heat away from the...DS172075- SKU:
- DS172075
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE:
- 3,500'
- DISPLACEMENT:
- 1200 CC
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.500'
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$142.75 -
COMETIC Top End Gasket Kit - XL1100 - EST C9761
COMETIC
$142.75A top-end rebuild demands gasket integrity that won't compromise under sustained combustion pressures and thermal cycling. COMETIC's EST (Extreme Sealing Technology) kit eliminates hot spots and premature failure through engineered heat dissipation,...DS172073- SKU:
- DS172073
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- MATERIAL:
- STAINLESS STEEL
- THICKNESS METRIC:
- 0.51 MM
- BORE SIZE:
- 3,350'
- DISPLACEMENT:
- 1100 CC
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.350'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- THICKNESS IMPERIAL:
- 0,020'
$142.75Qty in Cart: 0Quantity:Price:$142.75Subtotal: -
COMETIC Top End Gasket Kit - XL883 - EST C9760
COMETIC
$142.75A top-end rebuild demands precision sealing to prevent combustion gas leakage and coolant loss—failures that compromise power delivery and engine longevity. COMETIC's EST gasket kit eliminates hot spots through advanced thermal management, ensuring even...DS172072- SKU:
- DS172072
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE IMPERIAL:
- 3.000'
- DISPLACEMENT:
- 883 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,000'
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$142.75 -
COMETIC Rocker Gasket - EST - Big Twin C9753
COMETIC
$65.05Rocker box gasket failures lead to oil leaks, engine contamination, and costly downtime—especially on high-mileage or frequently serviced Big Twin motors. The COMETIC Rocker Gasket EST (C9753) eliminates guesswork with a complete, US-manufactured gasket...DS172065- SKU:
- DS172065
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- EST
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05 -
COMETIC Rocker Box Gasket - XL C9066
COMETIC
$47.20Rocker box gaskets are critical sealing points in any engine—failure here means oil leakage, contamination, and potential engine damage. The COMETIC Rocker Box Gasket Kit (C9066) eliminates guesswork by bundling every seal, gasket, and O-ring you need to...DS172059- SKU:
- DS172059
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MODEL:
- EST
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- MATERIAL:
- PAPER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$47.20Qty in Cart: 0Quantity:Price:$47.20Subtotal: -
COMETIC Rocker Box Gasket C9078
COMETIC
$47.20Rocker box gasket failure compromises engine sealing and invites oil leakage that accelerates wear on critical valve train components. The COMETIC C9078 delivers OEM-grade sealing with premium materials engineered for extended service intervals,...DS172057- SKU:
- DS172057
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MODEL:
- EST
- TYPE:
- ROCKER BOX
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$47.20Qty in Cart: 0Quantity:Price:$47.20Subtotal: -
COMETIC Base Gasket 3-5/8" - EVO/XL C9555
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for reliable horsepower and engine longevity. The COMETIC C9555 delivers a precision gasket engineered to withstand the combustion pressures and thermal cycling that stock gaskets simply can't handle...DS172054- SKU:
- DS172054
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
$33.55 -
COMETIC Metal Base Gasket - EVO/XL C9553
COMETIC
$33.55A failed base gasket doesn't just leak—it compromises your engine's structural integrity and forces oil past critical sealing surfaces. The COMETIC Metal Base Gasket C9553 is engineered to handle the thermal cycling and vibration that standard gaskets...DS172053- SKU:
- DS172053
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- UNITS:
- PAIR
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
$33.55 -
COMETIC Base Gasket - 3-5/8" - EVO/Big Twin C9552
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for reliable engine performance and longevity. The COMETIC C9552 base gasket delivers OEM-quality sealing on your EVO or Big Twin, preventing coolant and oil leakage that can compromise engine integrity...DS172052- SKU:
- DS172052
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
$33.55 -
COMETIC Metal Base Gasket - Big Twin C9551
COMETIC
$33.55A quality base gasket is critical to maintaining cylinder seal integrity and preventing oil leakage that compromises performance and engine longevity. The COMETIC Metal Base Gasket C9551 delivers the durability and precision fit that Big Twin Sportster...DS172051- SKU:
- DS172051
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- RIDING STYLE:
- STREET
$33.55
