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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PERFORMANCE MACHINE (PM) Cam Cover - Scalloped Platinum Cut - Twin Cam 0177-2020-BMP
PERFORMANCE MACHINE (PM)
$438.95Your engine bay deserves more than a plain stock cover—the PM Cam Cover delivers both precision aesthetics and functional durability where it matters. This scalloped platinum cut design replaces your original cover with a purpose-built component that...09401181- SKU:
- 09401181
- Availability:
- Ships Same Business Day
- Weight:
- 3.21 LBS
- COLOR/FINISH:
- PLATINUM CUT™
- MODEL:
- SCALLOP
- TYPE:
- CAM
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
$438.95 -
PERFORMANCE MACHINE (PM) Rocker Cover Box - Scalloped - Platinum Cut - Twin Cam 0177-2021-BMP
PERFORMANCE MACHINE (PM)
$738.95A worn or damaged rocker cover compromises engine sealing and detracts from your engine bay's appearance. The Performance Machine Scalloped Rocker Cover delivers precise OEM fitment with a refined aesthetic upgrade, featuring a machined logo and premium...09401182- SKU:
- 09401182
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POLISHED
- PRODUCT NAME:
- COVER
- UNITS:
- PAIR
- COLOR/FINISH:
- ANODIZED
- MOUNTING POSITION:
- FRONT
- BASE COLOR:
- BLACK
- BASE COLOR:
- SILVER
- BASE FINISH:
- ANODIZED
- MODEL:
- SCALLOP
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- STYLE:
- PLATINUM CUT
- TYPE:
- ROCKER BOX
$738.95 -
PERFORMANCE MACHINE (PM) Rocker Cover Box - Scalloped - Contrast Cut 0177-2021-BM
PERFORMANCE MACHINE (PM)
$698.95A rocker cover isn't just a cosmetic upgrade—it's a functional component that protects critical engine internals while projecting the attention to detail your build deserves. The PM Scalloped Rocker Cover delivers precision machining with genuine...09401161- SKU:
- 09401161
- Availability:
- Ships Same Business Day
- Weight:
- 4.30 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- STYLE:
- CONTRAST CUT™
- UNITS:
- PAIR
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- BASE COLOR:
- BLACK
- BASE COLOR:
- SILVER
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- MACHINED
- MODEL:
- SCALLOP
- MOUNTING POSITION:
- FRONT
$698.95 -
PERFORMANCE MACHINE (PM) Ignition Cover - Scalloped - 5 Hole - Contrast Cut 0177-2029-BM
PERFORMANCE MACHINE (PM)
$133.95A quality ignition cover does more than protect your timing components—it completes your engine's visual presentation and ensures reliable shielding against debris and heat. The PM Scalloped Ignition Cover delivers precision CNC machining with a...09401162- SKU:
- 09401162
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- STYLE:
- CONTRAST CUT™
- TYPE:
- IGNITION
- MODEL:
- SCALLOP
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$133.95 -
DRAG SPECIALTIES Rocker Box - Chrome - Sportster 302180
DRAG SPECIALTIES
$331.73Rocker boxes are critical to maintaining proper valve train geometry and oil circulation in your Sportster engine—a worn or leaking factory unit will compromise top-end performance and reliability. DRAG Specialties manufactures these to exact OEM...09400440- SKU:
- 09400440
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- TYPE:
- ROCKER BOX
$331.73 -
DRAG SPECIALTIES Compression Release Cap - Chrome 345000
DRAG SPECIALTIES
$22.21Compression release systems are functional workhorses, but there's no reason your engine bay should look incomplete. This chrome-finished billet aluminum cap transforms the plain plastic end cap into a polished finishing detail that complements quality...09500101- SKU:
- 09500101
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CAP
- TYPE:
- COMPRESSION RELEASE
- UNITS:
- PAIR
- COLOR/FINISH:
- CHROME
- MATERIAL:
- BILLET ALUMINUM
$22.21 -
DRAG SPECIALTIES Point Cover - Skull Chrome - 5 Hole 301711
DRAG SPECIALTIES
$38.11A point cover serves as both a functional engine component and a visual statement on your bike. This Drag Specialties skull design combines cast aluminum durability with a high-gloss chrome finish that resists corrosion while maintaining that aggressive...09401179- SKU:
- 09401179
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- TYPE:
- POINT
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$38.11 -
DRAG SPECIALTIES Rear Motor Mount - Dyna E28-0040
DRAG SPECIALTIES
$211.95Factory motor mounts degrade over time, allowing excessive engine movement that compromises handling precision and accelerates wear on surrounding components. The DRAG SPECIALTIES Rear Motor Mount delivers OEM-equivalent support with proven durability,...09330103- SKU:
- 09330103
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- BASE COLOR:
- BLACK
- MOUNTING POSITION:
- REAR
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
$211.95 -
DRAG SPECIALTIES Pistons - Twin Cam 21930-99-STD
DRAG SPECIALTIES
$157.89Twin Cam engines demand precision-engineered pistons that can withstand sustained high-RPM abuse while maintaining tight tolerances. Drag Specialties pistons are purpose-built for forced-induction applications and competition environments where stock...09110041- SKU:
- 09110041
- Availability:
- Ships Same Business Day
- Weight:
- 2.76 LBS
- UNITS:
- PAIR
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.750'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PRODUCT NAME:
- PISTON
$157.89 -
DRAG SPECIALTIES Oil Filter - Chrome - Indian T14-0025C
DRAG SPECIALTIES
$15.70Regular oil changes are non-negotiable for engine longevity, and the quality of your filter directly impacts how well your oil circulates and protects critical engine components. This Drag Specialties spin-on filter delivers OEM-equivalent filtration...07120480- SKU:
- 07120480
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$15.70Qty in Cart: 0Quantity:Price:$15.70Subtotal: -
DRAG SPECIALTIES Oil Filter - Black - Indian T14-0025
DRAG SPECIALTIES
$12.55Clean oil is non-negotiable for engine longevity, and a quality filter is your first line of defense against contaminants that compromise performance and reliability. The Drag Specialties Oil Filter delivers OEM-equivalent filtration in a proven spin-on...07120479- SKU:
- 07120479
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$12.55 -
DRAG SPECIALTIES Peaked Design Oil Dipstick - Dyna 63187F
DRAG SPECIALTIES
$61.43An accurate oil level reading is fundamental to engine health and performance—a worn or damaged dipstick can lead to overfilling or underfilling, both of which compromise lubrication and increase wear. The DRAG SPECIALTIES Peaked Design Oil Dipstick is a...07100150- SKU:
- 07100150
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- OIL DIPSTICK
- BASE COLOR:
- SILVER
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TYPE:
- SWIVEL
$61.43Qty in Cart: 0Quantity:Price:$61.43Subtotal: -
DRAG SPECIALTIES Oil Filter - Black 140004B-BX29
DRAG SPECIALTIES
$10.45A quality oil filter is non-negotiable for engine longevity and reliability. This Drag Specialties spin-on filter delivers consistent filtration across most Harley-Davidson models, protecting critical engine components from wear-inducing contaminants. By...DS275206- SKU:
- DS275206
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- STYLE:
- STANDARD
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- SPIN-ON
- FEATURES:
- WITHOUT NUT
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$10.45 -
DRAG SPECIALTIES Top Motor Mount 28-0026-SC3
DRAG SPECIALTIES
$65.67Engine movement under hard acceleration puts stress on motor mounts, compromising handling precision and accelerating component wear. The Drag Specialties Top Motor Mount eliminates excessive engine rocking with 30% thicker construction, keeping your...DS273619- SKU:
- DS273619
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- COLOR/FINISH:
- CHROME
- TYPE:
- MOTOR
- UNITS:
- KIT
- PRODUCT NAME:
- MOUNT
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- TOP
$65.67 -
DRAG SPECIALTIES Rocker Box - Twin Cam I33-0103A
DRAG SPECIALTIES
$326.43The rocker box serves as a critical seal on your Twin Cam engine—any leakage compromises oil pressure, cooling efficiency, and overall engine reliability. Drag Specialties engineered this unit with precision tolerances and exact dimensions to eliminate...09400737- SKU:
- 09400737
- Availability:
- Ships Same Business Day
- Weight:
- 4.01 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- BASE FINISH:
- CHROME
- UNITS:
- KIT
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
$326.43 -
DRAG SPECIALTIES Points Cover - Chrome 30-0170A
DRAG SPECIALTIES
$29.63A points cover does more than protect your ignition system—it completes your bike's visual package with cohesive styling that matches your brake calipers and fork hardware. Chrome construction resists corrosion while delivering the polished aesthetic...78050080- SKU:
- 78050080
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- STYLE:
- RADIUS
- RIDING STYLE:
- STREET
- TYPE:
- POINTS
$29.63Qty in Cart: 0Quantity:Price:$29.63Subtotal: -
DRAG SPECIALTIES Rocker Arm Seal Kit - Big Twin 04-0988-1-HC
DRAG SPECIALTIES
$6.31Rocker arm shaft seals are critical to maintaining proper valve train geometry and preventing oil leakage that compromises engine performance. This complete rebuild kit eliminates the frustration of constant re-shimming and adjustment drift, giving you...09270005- SKU:
- 09270005
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER ARM
- UNITS:
- 4 PACK
$6.31Qty in Cart: 0Quantity:Price:$6.31Subtotal: -
DRAG SPECIALTIES Cylinder - Rear - 1200cc - 1966-1980 Shovelhead 750604-BX-LB2
DRAG SPECIALTIES
$226.79If you're rebuilding or upgrading a classic Shovelhead, cylinder condition is non-negotiable—worn or stock cylinders will limit your engine's potential and reliability. These DRAG SPECIALTIES rear cylinders are cast-iron units engineered to OEM...DS750604- SKU:
- DS750604
- Availability:
- Ships Same Business Day
- Weight:
- 12.13 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- CYLINDER
- UNITS:
- EACH
- BORE SIZE IMPERIAL:
- 3.435'
- DISPLACEMENT:
- 1200 CC
- COLOR/FINISH:
- BLACK
- TYPE:
- REAR
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- RIDING STYLE:
- STREET
$226.79 -
DRAG SPECIALTIES Cylinder - Front - 1200cc - 1966-1980 Shovelhead 750605-BX-LB2
DRAG SPECIALTIES
$204.53If you're running a 1966-1980 Shovelhead and want reliable power without compromise, this DRAG SPECIALTIES front cylinder delivers the thermal stability and pressure tolerance your engine needs. Cast-iron construction meets or exceeds OEM specs while...DS750605- SKU:
- DS750605
- Availability:
- Ships Same Business Day
- Weight:
- 11.63 LBS
- UNITS:
- EACH
- BORE SIZE IMPERIAL:
- 3.435'
- DISPLACEMENT:
- 1200 CC
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- RIDING STYLE:
- STREET
- TYPE:
- FRONT
- COLOR/FINISH:
- BLACK
- MATERIAL:
- IRON
- PRODUCT NAME:
- CYLINDER
$204.53 -
DRAG SPECIALTIES Cylinder - Rear - 74" - 1948-1965 Panhead 750606-BX-LB2
DRAG SPECIALTIES
$204.53If you're running a vintage Panhead and pushing your engine beyond stock parameters, OEM cylinders become a liability. This DRAG SPECIALTIES rear cylinder is cast-iron construction engineered to meet or exceed original tolerance specifications while...DS750606- SKU:
- DS750606
- Availability:
- Ships Same Business Day
- Weight:
- 11.63 LBS
- DISPLACEMENT:
- 74'
- MATERIAL:
- IRON
- PRODUCT NAME:
- CYLINDER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- TYPE:
- REAR
- BORE SIZE IMPERIAL:
- 3.435'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- RIDING STYLE:
- STREET
$204.53
