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
-
KB PERFORMANCE Piston - Evolution KB920C.010
KB PERFORMANCE
$299.95A piston's job is simple: survive extreme combustion pressures while maintaining precision fit and minimal friction. The KB PERFORMANCE Evolution KB920C.010 delivers this through forged 4032 aluminum...09105056- SKU:
- 09105056
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- COMPRESSION RATIO IMPERIAL:
- 9.5:1
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,010'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.498'
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$299.95 -
KB PERFORMANCE Piston - Evolution KB921C.005
KB PERFORMANCE
$299.95KB Performance's Evolution KB921C.005 pistons deliver the reliability and precision required for sustained high-RPM operation. Built from 4032 aluminum alloy and featuring an offset pin design, these...09105058- SKU:
- 09105058
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- BORE - OVERSIZE:
- +0,005'
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- BORE SIZE IMPERIAL:
- 3.498'
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- STREET
$299.95 -
KB PERFORMANCE Forged Piston Kit - Twin Cam KB660C.STD
KB PERFORMANCE
$322.95If you're running a twin-cam engine at the limit, stock pistons won't cut it. The KB PERFORMANCE Forged Piston Kit delivers the durability and precision you need for serious boost, high RPM, and...09103970- SKU:
- 09103970
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.875'
- RIDING STYLE:
- STREET
$322.95 -
KB PERFORMANCE Forged Piston Kit - Twin Cam KB662C.STD
KB PERFORMANCE
$322.95When your engine demands precision and reliability at high RPM, factory pistons simply won't cut it. The KB PERFORMANCE Forged Piston Kit delivers the strength and consistency you need for...09103976- SKU:
- 09103976
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 4.125'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$322.95 -
JAMES GASKET Starter Shaft Seal - Big Twin 12053-A
JAMES GASKET
$28.00A leaking starter shaft seal doesn't just waste oil—it compromises engine reliability and can lead to costly damage if left unchecked. The JAMES GASKET Starter Shaft Seal is engineered to provide a...DS194089- SKU:
- DS194089
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- STARTER SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$28.00 -
JAMES GASKET Countershaft Nut with Seal - Big Twin 35211-36DL
JAMES GASKET
$51.95Transmission oil leakage is a costly problem that compounds over time—worn main drive gear bushings allow fluid to escape past the countershaft nut, leading to inadequate lubrication and potential...DS194076- SKU:
- DS194076
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- SUPER NUT
- APPLICATION:
- SPROCKET
- PRODUCT NAME:
- NUT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$51.95 -
JAMES GASKET Shifter Shaft Inner Seal - Big Twin 12066
JAMES GASKET
$31.20Shifter shaft seals are critical wear items that prevent transmission fluid from leaking into your primary case, compromising both your drivetrain efficiency and engine cleanliness. A worn or failed...DS194084- SKU:
- DS194084
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- STARTER SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$31.20 -
JAMES GASKET Pushrod Seal Set - Shovelhead 11133-FLH
JAMES GASKET
$11.95Pushrod seal degradation is one of the most common causes of oil leakage and compression loss in Shovelhead engines—and ignoring it leads to catastrophic engine damage. This complete James Gasket...DS194486- SKU:
- DS194486
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- X-RING
- TYPE:
- QUAD SEAL
- APPLICATION:
- PUSHROD TUBE
- UNITS:
- KIT
$11.95 -
JAMES GASKET Pushrod Seal Set - XL 11190-V2
JAMES GASKET
$17.95A cam change or pushrod seal replacement demands precision—using mismatched or worn seals compromises oil containment and engine reliability. The JAMES GASKET Pushrod Seal Set XL 11190-V2 eliminates...DS194487- SKU:
- DS194487
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- PUSHROD COVER
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
$17.95 -
JAMES GASKET Pushrod Seal Set - XL 11101-XL
JAMES GASKET
$8.95A complete pushrod seal rebuild requires precision-matched components—using mismatched or worn seals compromises oil control and engine reliability. The JAMES GASKET Pushrod Seal Set XL 11101-XL...DS194488- SKU:
- DS194488
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- KIT
- APPLICATION:
- PUSHROD TUBE
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
$8.95 -
JAMES GASKET Pushrod Seal Set - XL 17955-36-XL
JAMES GASKET
$14.95A complete pushrod seal rebuild requires precision components matched to your engine's exact specifications—and guessing on seal counts wastes time and money. The JAMES GASKET Pushrod Seal Set...DS194489- SKU:
- DS194489
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- CORK
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- STREET
- APPLICATION:
- PUSHROD COVER
$14.95 -
JAMES GASKET Pushrod Seal Set - Big Twin 11133-FL
JAMES GASKET
$11.95Cam changes and Big Twin rebuilds demand precision sealing to prevent oil leakage and maintain crankcase pressure—this is where quality pushrod seals become non-negotiable. The JAMES GASKET Pushrod...DS194491- SKU:
- DS194491
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$11.95 -
JAMES GASKET Intake Manifold Spacer - 1.86" 29250-98-A
JAMES GASKET
$29.95Carburetor fuel boiling is a silent killer of performance—it starves your engine of consistent fuel delivery and causes stumbling, hesitation, and lost power, especially under sustained high-heat...20111214- SKU:
- 20111214
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- INSULATOR BLOCK
- RIDING STYLE:
- STREET
- TYPE:
- CARBURETOR
$29.95 -
DRAG SPECIALTIES Piston - Twin Cam 21988-07+.005
DRAG SPECIALTIES
$135.63Twin Cam engine rebuilds demand pistons that balance OEM reliability with cost-effectiveness—and this Drag Specialties piston delivers both. The cast aluminum alloy construction with...09110018- SKU:
- 09110018
- Availability:
- Ships Same Business Day
- Weight:
- 2.41 LBS
- BORE - OVERSIZE:
- +0,005'
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.755'
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PISTON DIAMETER IMPERIAL:
- 3.755'
- PRODUCT NAME:
- PISTON
- STROKE LENGTH IMPERIAL:
- 4-3/8'
$135.63Qty in Cart: 0Quantity:Price:$135.63Subtotal: -
DRAG SPECIALTIES Piston - Twin Cam 21988-07+.010
DRAG SPECIALTIES
$135.63OEM-quality piston replacement is essential for maintaining engine integrity and performance in your Twin Cam build. This cast aluminum alloy construction delivers the durability you need for...09110019- SKU:
- 09110019
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- BORE - OVERSIZE:
- +0,010'
- COMPRESSION RATIO IMPERIAL:
- 9.2:1
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- RIDING STYLE:
- STREET
- PISTON DIAMETER IMPERIAL:
- 3.760'
- BORE SIZE IMPERIAL:
- 3.760'
- PRODUCT NAME:
- PISTON
- STROKE LENGTH IMPERIAL:
- 4-3/8'
$135.63 -
GARDNER-WESTCOTT Male Connector - 3/16" x 1/8" NPT 7-48IC-3X2
GARDNER-WESTCOTT
$6.95Fluid system reliability depends on secure, leak-free connections at every junction. This Gardner-Westcott male connector provides the precision fit and durability required in high-performance...DS245250- SKU:
- DS245250
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- FITTING
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- CONNECTOR ANGLE:
- STRAIGHT
- CONNECTION TYPE:
- 1/8' NPT (MALE)
$6.95Qty in Cart: 0Quantity:Price:$6.95Subtotal: -
GARDNER-WESTCOTT Union - 3/8" - Chrome 7-92HB-6X6
GARDNER-WESTCOTT
$8.95A quality union fitting is essential for building reliable hydraulic and pneumatic systems that won't leak under pressure or vibration. This Gardner-Westcott 3/8" union delivers the precision...DS245252- SKU:
- DS245252
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- CONNECTION TYPE:
- 3/8' HOSE FITTING
- UNITS:
- EACH
- CONNECTOR ANGLE:
- STRAIGHT
- TYPE:
- HOSE
- PRODUCT NAME:
- FITTING
$8.95 -
GARDNER-WESTCOTT 1/8" NPT Hex Plug - Chrome 7-121PP-2
GARDNER-WESTCOTT
$5.95A quality hex plug is essential for sealing NPT ports on fuel systems, oil lines, and cooling circuits—preventing leaks that compromise performance and reliability. This Gardner-Westcott plug...DS245262- SKU:
- DS245262
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- CONNECTION TYPE:
- 1/8' NPT (MALE)
- COLOR/FINISH:
- CHROME
- TYPE:
- OIL DRAIN
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$5.95 -
GARDNER-WESTCOTT Breather Fitting - 1/4" NPT - 90 Degree 7-116PSE-4
GARDNER-WESTCOTT
$13.95Proper crankcase ventilation is essential for engine longevity and reliable operation, especially in high-performance applications where pressure buildup can compromise seals and gaskets. This...DS245264- SKU:
- DS245264
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- CONNECTION TYPE:
- 1/4' NPT (FEMALE)
- CONNECTOR ANGLE:
- 90°
- PRODUCT NAME:
- FITTING
- RIDING STYLE:
- STREET
- TYPE:
- BREATHER
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- BASE FINISH:
- CHROME
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- POLISHED
- CONNECTION TYPE:
- 1/4' NPT (MALE)
$13.95 -
GARDNER-WESTCOTT Breather Fitting - 1/4" NPT - 45 Degree 7-124PSE-4
GARDNER-WESTCOTT
$15.95Proper crankcase ventilation is essential for engine longevity and consistent performance, and this Gardner-Westcott breather fitting ensures clean, efficient airflow without compromising seal...DS245265- SKU:
- DS245265
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- CONNECTION TYPE:
- 1/4' NPT (MALE)
- CONNECTOR ANGLE:
- 45°
- PRODUCT NAME:
- FITTING
- BASE FINISH:
- POLISHED
- TYPE:
- BREATHER
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- COLOR/FINISH:
- POLISHED
- CONNECTION TYPE:
- 1/4' NPT (FEMALE)
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$15.95
