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
-
On Sale
COLONY Cylinder Stud Set - 1978-1984 Big Twin 8857-8
COLONY
MSRP: $39.95Now: $35.96Was: $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 restores proper clamp load and eliminates the risk of...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
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
EMGO Oil Filter - Black 10-82410
EMGO
MSRP: $7.08Now: $6.73Was: $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 removal, keeping your oil clean and your engine...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
MSRP: $7.08Now: $6.73Was: $7.08 -
On Sale
COMETIC Complete Gasket Kit - Evo C9846F
COMETIC
MSRP: $356.95Now: $321.26Was: $356.95A 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 or high RPM. COMETIC's C9846F delivers OEM-quality...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
MSRP: $356.95Now: $321.26Was: $356.95 -
On Sale
COMETIC Motor Gasket Kit - 1200 XL - .030" C9855F
COMETIC
MSRP: $202.60Now: $182.34Was: $202.60A 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 temperature, giving you the reliability you need whether...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
MSRP: $202.60Now: $182.34Was: $202.60 -
On Sale
COMETIC Complete Gasket Kit - 1200 XL C9757F
COMETIC
MSRP: $265.60Now: $239.04Was: $265.60A 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 XL engine—head, valve stems, exhaust, and covers—all in...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
MSRP: $265.60Now: $239.04Was: $265.60 -
On Sale
COMETIC Complete Gasket Kit - Softail C9184
COMETIC
MSRP: $287.65Now: $258.89Was: $287.65A 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 full-coverage solution eliminates guesswork and protects...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
MSRP: $287.65Now: $258.89Was: $287.65 -
On Sale
COMETIC Primary Case O-Ring C9441
COMETIC
Now: $16.11Was: $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 premium fuel-resistant elastomer that resists creep,...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
Now: $16.11Was: $17.90Qty in Cart: 0Quantity:Price:Now: $16.11Was: $17.90Subtotal: -
On Sale
COMETIC Starter Shaft Seal C9261
COMETIC
Now: $13.32Was: $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 restores the critical barrier between your starter motor...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
Now: $13.32Was: $14.80 -
On Sale
COMETIC Cam Sensor O-Ring C9627
COMETIC
Now: $4.41Was: $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 COMETIC C9627 replaces the worn elastomer with a...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
Now: $4.41Was: $4.90 -
On Sale
COMETIC Top End Gasket Kit - M8 C10217
COMETIC
MSRP: $240.40Now: $216.36Was: $240.40A 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 Sealing Technology) gaskets engineered to handle the...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
MSRP: $240.40Now: $216.36Was: $240.40 -
On Sale
COMETIC Top End Gasket Kit - M8 C10223
COMETIC
MSRP: $240.40Now: $216.36Was: $240.40A 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 and maintain reliable compression across the entire...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
MSRP: $240.40Now: $216.36Was: $240.40 -
On Sale
COMETIC Motor Gasket Kit - M8 C10250
COMETIC
MSRP: $267.70Now: $240.93Was: $267.70Engine 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 compromise seal integrity. This complete top-end rebuild kit...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
MSRP: $267.70Now: $240.93Was: $267.70 -
On Sale
COMETIC Pushrod Cover Seals C9598
COMETIC
Now: $6.30Was: $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 engineered to eliminate leaks at critical pressure points...09344713- SKU:
- 09344713
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- PUSHROD COVER
Now: $6.30Was: $7.00 -
On Sale
COMETIC Head Gasket - .040" - Twin Cam C9726
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A 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 design distributes clamping force evenly across the sealing...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
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Engine Gasket Kit - Iron XL C9051F
COMETIC
MSRP: $176.35Now: $158.72Was: $176.35A 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 application, ensuring proper sealing across all engine...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
MSRP: $176.35Now: $158.72Was: $176.35 -
On Sale
COMETIC Main Shaft Seal C9359
COMETIC
MSRP: $8.95Now: $8.06Was: $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 serious builders demand, engineered to resist fuel...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
MSRP: $8.95Now: $8.06Was: $8.95 -
On Sale
EASTERN MOTORCYCLE PARTS Bushing Kit - Cam Gear - XL 15-0157
EASTERN MOTORCYCLE PARTS
MSRP: $182.95Now: $166.48Was: $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 restores factory tolerances, eliminating play that degrades...09251168- SKU:
- 09251168
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- BUSHING KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $182.95Now: $166.48Was: $182.95 -
On Sale
EASTERN MOTORCYCLE PARTS Mount Studs A-16864-48
EASTERN MOTORCYCLE PARTS
Now: $13.47Was: $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 longevity. Whether you're assembling a custom build or...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
Now: $13.47Was: $14.80 -
On Sale
EASTERN MOTORCYCLE PARTS Piston Pin Clip A-22588-78
EASTERN MOTORCYCLE PARTS
Now: $4.82Was: $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 A-22588-78 meets or exceeds OEM specifications,...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
Now: $4.82Was: $5.30 -
On Sale
EASTERN MOTORCYCLE PARTS Piston Pin Clip A-22582-52
EASTERN MOTORCYCLE PARTS
Now: $6.10Was: $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 catastrophic engine damage, making OEM-quality replacement...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
Now: $6.10Was: $6.70
