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
-
COLONY Cylinder Stud Set - 1978-1984 Big Twin 8857-8
COLONY
$39.95Cylinder studs endure extreme pressures and thermal cycling on every ignition cycle—factory originals can stretch, corrode, or fail under sustained performance conditions. This COLONY stud set...DS189955- SKU:
- DS189955
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- TYPE:
- CYLINDER
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- STUD SET
- RIDING STYLE:
- STREET
- UNITS:
- 8 PACK
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
EMGO Oil Filter - Black 10-82410
EMGO
$7.08A quality oil filter is non-negotiable for engine longevity and performance. The EMGO 10-82410 uses premium materials and robust construction to ensure consistent flow rates and effective contaminant...1082410- SKU:
- 1082410
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- BASE COLOR:
- BLACK
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
$7.08 -
COMETIC Complete Gasket Kit - Evo C9846F
COMETIC
$382.95A complete gasket kit eliminates the risk of installing mismatched or substandard gaskets across your engine—a common source of leaks and performance loss that can compromise reliability under boost...09340799- SKU:
- 09340799
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
$382.95 -
COMETIC Motor Gasket Kit - 1200 XL - .030" C9855F
COMETIC
$215.95A complete gasket failure can leave you stranded or worse—cost you a race. The COMETIC Motor Gasket Kit for 1200 XL engines uses premium materials engineered to seal under extreme pressure and...09340800- SKU:
- 09340800
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
$215.95 -
COMETIC Complete Gasket Kit - 1200 XL C9757F
COMETIC
$283.95A failed gasket can cost you race time, engine damage, and thousands in repairs. The COMETIC Complete Gasket Kit C9757F eliminates guesswork by delivering OEM-quality sealing across your entire 1200...09340805- SKU:
- 09340805
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
$283.95 -
COMETIC Complete Gasket Kit - Softail C9184
COMETIC
$309.95A complete gasket kit engineered for reliability and sealed performance—critical when you're pushing your Softail to its limits. OEM gaskets wear out, leak, and compromise compression; Cometic's...09341229- SKU:
- 09341229
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- UNITS:
- KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,875'
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
$309.95 -
COMETIC Primary Case O-Ring C9441
COMETIC
$17.90Engine case sealing demands precision and reliability—a failed o-ring can lead to oil leaks, contamination, and catastrophic internal damage. The COMETIC Primary Case O-Ring C9441 is engineered from...09350161- SKU:
- 09350161
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- NITRILE RUBBER
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- INNER PRIMARY
- RIDING STYLE:
- STREET
$17.90 -
COMETIC Starter Shaft Seal C9261
COMETIC
$14.80A leaking starter shaft seal can compromise engine oil integrity and starter reliability, leading to costly repairs down the line. The COMETIC C9261 is a precision-engineered replacement seal that...09350163- SKU:
- 09350163
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$14.80 -
COMETIC Cam Sensor O-Ring C9627
COMETIC
$4.90A failing cam sensor O-ring compromises your engine's ability to maintain precise fuel and ignition timing, leading to rough idle, reduced power delivery, and potential check engine codes. The...09350164- SKU:
- 09350164
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- CAM POSITION SENSOR
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
$4.90 -
COMETIC Top End Gasket Kit - M8 C10217
COMETIC
$257.95A failed head gasket can sideline your engine for weeks and cost thousands in repairs. The COMETIC Top End Gasket Kit C10217 eliminates the guesswork with a complete, matched set of EST (Extreme...09346323- SKU:
- 09346323
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.937'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
$257.95Qty in Cart: 0Quantity:Price:$257.95Subtotal: -
COMETIC Top End Gasket Kit - M8 C10223
COMETIC
$257.95A failed top-end gasket doesn't just waste your time—it compromises engine integrity and leaves you stranded. The COMETIC M8 C10223 gasket kit uses Extreme Sealing Technology to eliminate hot spots...09346325- SKU:
- 09346325
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- RIDING STYLE:
- STREET
$257.95 -
COMETIC Motor Gasket Kit - M8 C10250
COMETIC
$286.95Engine gasket failure can cost you race time and money. The COMETIC M8 C10250 Motor Gasket Kit uses EST (Extreme Sealing Technology) to eliminate hot spots and uneven heat distribution that...09346326- SKU:
- 09346326
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
$286.95Qty in Cart: 0Quantity:Price:$286.95Subtotal: -
COMETIC Pushrod Cover Seals C9598
COMETIC
$7.00Pushrod cover leaks compromise engine sealing integrity and create messy, unreliable conditions under the hood. The COMETIC C9598 Pushrod Cover Seals kit supplies OEM-quality seals and O-rings...09344713- SKU:
- 09344713
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- PUSHROD COVER
$7.00 -
COMETIC Head Gasket - .040" - Twin Cam C9726
COMETIC
$64.95A quality head gasket is fundamental to maintaining cylinder pressure and preventing coolant/oil cross-contamination—failures here cascade into catastrophic engine damage. The COMETIC C9726 MLS...09340003- SKU:
- 09340003
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- MATERIAL:
- LAYERED STEEL
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$64.95 -
COMETIC Engine Gasket Kit - Iron XL C9051F
COMETIC
$189.95A complete gasket kit is the foundation of a reliable, leak-free engine build. Factory gaskets degrade under heat and pressure—COMETIC's engineered solutions use purpose-built materials for each...09344800- SKU:
- 09344800
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,1875'
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
$189.95 -
COMETIC Main Shaft Seal C9359
COMETIC
$8.95A failed main shaft seal compromises engine integrity and invites fluid leakage that accelerates wear on critical components. The COMETIC C9359 delivers the reliability professional racers and...09350202- SKU:
- 09350202
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- EACH
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
$8.95 -
EASTERN MOTORCYCLE PARTS Bushing Kit - Cam Gear - XL 15-0157
EASTERN MOTORCYCLE PARTS
$182.95Worn cam gear bushings compromise valve timing accuracy and increase parasitic drag on your engine—directly impacting power delivery and reliability. This Eastern Motorcycle Parts bushing kit...09251168- SKU:
- 09251168
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- BUSHING KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$182.95 -
EASTERN MOTORCYCLE PARTS Mount Studs A-16864-48
EASTERN MOTORCYCLE PARTS
$14.80Reliable mounting starts with quality hardware. These Eastern Motorcycle Parts mount studs provide the secure, vibration-resistant foundation your motorcycle needs for consistent performance and...09300110- SKU:
- 09300110
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- STUD SET
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- TYPE:
- TOP MOTOR MOUNT
$14.80 -
EASTERN MOTORCYCLE PARTS Piston Pin Clip A-22588-78
EASTERN MOTORCYCLE PARTS
$5.30Piston pin clips are critical retention components that keep your piston pin secured in place during combustion cycles—any failure here means catastrophic engine damage. The EASTERN MOTORCYCLE PARTS...DS750598- SKU:
- DS750598
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- CLIP
- RIDING STYLE:
- STREET
- TYPE:
- PIN
- APPLICATION:
- PISTON
- UNITS:
- 10 PACK
$5.30 -
EASTERN MOTORCYCLE PARTS Piston Pin Clip A-22582-52
EASTERN MOTORCYCLE PARTS
$6.70A piston pin clip is a critical retention component that keeps your piston pin seated and secure under extreme combustion pressures and RPM loads. Failure or wear of this clip can lead to...DS750599- SKU:
- DS750599
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- PISTON
- UNITS:
- 10 PACK
- PRODUCT NAME:
- CLIP
- RIDING STYLE:
- STREET
- TYPE:
- PIN
$6.70
