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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DRAG SPECIALTIES Piston - XL 750769-BX-LB1
DRAG SPECIALTIES
$132.45OEM-quality pistons are the foundation of a reliable, efficient engine—and replacements need to match that standard. The DRAG SPECIALTIES XL 750769-BX-LB1 delivers cast aluminum construction with a friction-reducing coating that keeps combustion...DS750769- SKU:
- DS750769
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- BORE SIZE IMPERIAL:
- 3.518'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PISTON DIAMETER IMPERIAL:
- 3.518'
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,020'
$132.45Qty in Cart: 0Quantity:Price:$132.45Subtotal: -
DRAG SPECIALTIES Piston - XL 750768-BX-LB1
DRAG SPECIALTIES
$132.45If you're rebuilding an engine or replacing worn pistons, you need components that deliver OEM-level reliability without the premium price tag. The DRAG SPECIALTIES XL 750768-BX-LB1 pistons combine cast aluminum durability with a friction-reducing...DS750768- SKU:
- DS750768
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- BORE - OVERSIZE:
- +0,010'
- BORE SIZE IMPERIAL:
- 3.508'
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PISTON DIAMETER IMPERIAL:
- 3.508'
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- UNITS:
- KIT
$132.45 -
ACCUTRONIX Oil Filter Mount - Chrome RM2141-C
ACCUTRONIX
$138.95A proper oil filter mounting solution is critical for maintaining clean oil flow and system reliability in high-performance applications. The ACCUTRONIX Oil Filter Mount eliminates improvised setups and provides a precision-engineered, regulator-ready...DS190781- SKU:
- DS190781
- Availability:
- Ships Same Business Day
- Weight:
- 1.22 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- MOUNT
- BASE FINISH:
- CHROME
- UNITS:
- KIT
- TYPE:
- OIL FILTER
$138.95 -
GARDNER-WESTCOTT Turn Signal Lens Bolt Kit P-61-13
GARDNER-WESTCOTT
$22.95Proper fastening is critical when securing turn signal lenses—loose bolts lead to vibration, water ingress, and lens failure on the track or street. The Gardner-Westcott P-61-13 kit delivers OEM-quality chrome socket-head bolts paired with O-ring seals,...DS190127- SKU:
- DS190127
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- BOLT KIT
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TYPE:
- TURN SIGNAL LENS
$22.95 -
GARDNER-WESTCOTT Polished Swing Arm Bolts - 7/16"-20 P-80-40
GARDNER-WESTCOTT
$19.95Swing arm bolts endure constant stress from suspension articulation and cornering loads, making quality fasteners essential for safety and reliability. The GARDNER-WESTCOTT P-80-40 delivers the durability and precision fit your race-proven chassis...DS190123- SKU:
- DS190123
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- BASE FINISH:
- CHROME
- DIAMETER - THREAD SIZE IMPERIAL:
- 7/16-14
- PRODUCT NAME:
- BOLT KIT
- RIDING STYLE:
- STREET
- TYPE:
- SWINGARM
- UNITS:
- KIT
- COLOR/FINISH:
- CHROME
- DIAMETER - THREAD SIZE:
- 7/16-14
- LENGTH:
- 1-1/4'
- LENGTH IMPERIAL:
- 1-1/4'
$19.95Qty in Cart: 0Quantity:Price:$19.95Subtotal: -
GARDNER-WESTCOTT Polished Swing Arm Bolts - 7/16"-14 P-80-79
GARDNER-WESTCOTT
$28.95Swing arm bolts endure constant stress from suspension articulation and cornering loads—undersized or corroded fasteners will compromise handling precision and create safety risks. GARDNER-WESTCOTT's polished bolts deliver corrosion resistance and...DS190121- SKU:
- DS190121
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- BASE FINISH:
- CHROME
- PRODUCT NAME:
- BOLT KIT
- UNITS:
- KIT
- DIAMETER - THREAD SIZE:
- 7/16-20
- COLOR/FINISH:
- CHROME
- LENGTH:
- 1-1/4'
- DIAMETER - THREAD SIZE IMPERIAL:
- 7/16-20
- LENGTH IMPERIAL:
- 1-1/4'
- RIDING STYLE:
- STREET
- TYPE:
- SWINGARM
$28.95Qty in Cart: 0Quantity:Price:$28.95Subtotal: -
COLONY Cylinder Stud Set 8858-8
COLONY
$37.95Cylinder studs are critical fastening points that withstand extreme combustion pressures and thermal cycling. Factory originals can stretch and fail under high-boost or nitrous applications, leading to catastrophic head gasket failure. The COLONY...DS189954- SKU:
- DS189954
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- TYPE:
- CYLINDER
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- STUD SET
- RIDING STYLE:
- STREET
- UNITS:
- 8 PACK
$37.95 -
COLONY Cylinder Stud Set 9424-8
COLONY
$101.95Cylinder studs are critical fastening components that secure your cylinder head under extreme pressure and temperature cycling. Factory studs can stretch, fail, or lose clamp load over time—especially in high-boost or high-RPM applications. The COLONY...DS189953- SKU:
- DS189953
- Availability:
- Ships Same Business Day
- Weight:
- 1.44 LBS
- PRODUCT NAME:
- STUD SET
- RIDING STYLE:
- STREET
- UNITS:
- 8 PACK
- TYPE:
- CYLINDER
$101.95 -
COLONY Cylinder Stud Set 9507-8
COLONY
$88.95Cylinder studs are critical fasteners that withstand extreme pressure and thermal cycling in high-performance engines. Weak or stock studs can stretch, fail, or cause catastrophic engine damage during boost or high-RPM operation. The COLONY Cylinder Stud...DS189952- SKU:
- DS189952
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER
- UNITS:
- 8 PACK
- PRODUCT NAME:
- STUD SET
$88.95 -
COLONY Hydraulic Pushrods - Big Twin 7515-4
COLONY
$74.95COLONY Hydraulic Pushrods deliver the precision valve actuation your Big Twin demands, with aerospace-grade materials engineered to withstand extreme RPM and heat cycles. Stock pushrods flex and wear under high-performance demands—these aircraft-grade...DS189849- SKU:
- DS189849
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PUSHROD SET
- RIDING STYLE:
- STREET
- STYLE:
- FIXED LENGTH
- UNITS:
- SET OF 4
$74.95 -
COLONY Hydraulic Pushrods - Big Twin 7516-4
COLONY
$74.95COLONY Hydraulic Pushrods are engineered for Big Twin engines that demand reliable valve actuation under high RPM and sustained load. Aircraft-grade aluminum construction keeps reciprocating weight to a minimum, reducing parasitic losses and improving...DS189848- SKU:
- DS189848
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PUSHROD SET
- RIDING STYLE:
- STREET
- UNITS:
- SET OF 4
- STYLE:
- HYDRAULIC
$74.95 -
COLONY Pushrod Kit - 74" - Big Twin 7122-4
COLONY
$57.95Pushrods are critical valve train components that must maintain precise tolerances under extreme heat and RPM conditions. The COLONY Pushrod Kit delivers aircraft-grade construction with heat-treated steel tips, ensuring reliability whether you're...DS189847- SKU:
- DS189847
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- PUSHROD SET
- RIDING STYLE:
- STREET
- STYLE:
- FIXED LENGTH
- MATERIAL:
- ALUMINUM
- UNITS:
- SET OF 4
$57.95 -
COLONY Pushrod Kit - XL 7123-4
COLONY
$57.95Stock pushrods are often the first weak link in a high-rpm engine, flexing under load and throwing off valve timing at critical moments. The COLONY Pushrod Kit XL 7123-4 replaces that liability with aircraft-grade aluminum construction and heat-treated...DS189846- SKU:
- DS189846
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PUSHROD SET
- RIDING STYLE:
- STREET
- STYLE:
- FIXED LENGTH
- UNITS:
- SET OF 4
$57.95 -
COLONY Tappet Adjuster Locknuts 8780-4
COLONY
$12.95Valve train stability depends on precision fastening, and loose or corroded tappet locknuts compromise both performance and reliability. COLONY's split locknuts are engineered to maintain consistent preload on your valve adjusters, eliminating the risk...DS189844- SKU:
- DS189844
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- LOCK
- UNITS:
- 4 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- NUT
$12.95 -
GARDNER-WESTCOTT Fender Rail Bolt Kit DS-189800
GARDNER-WESTCOTT
$29.95If you're mounting fender rails to an aftermarket Softail-style frame, fastener quality directly impacts structural integrity and longevity. This Gardner-Westcott kit delivers U.S.A.-made precision hardware engineered specifically for this application,...DS189800- SKU:
- DS189800
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BOLT KIT
- TYPE:
- FENDER RAIL
- UNITS:
- KIT
- LENGTH:
- 1'
$29.95 -
GARDNER-WESTCOTT Stainless Steel - Primary SP-10-24-08N
GARDNER-WESTCOTT
$56.95Protecting your motor's internals from contamination and heat loss requires quality cover components that won't degrade under sustained use. GARDNER-WESTCOTT's stainless steel covers resist corrosion and maintain structural integrity through countless...DS189379- SKU:
- DS189379
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BASE FINISH:
- NATURAL
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- BOLT KIT
- TYPE:
- CLUTCH COVER
- TYPE:
- PRIMARY
- UNITS:
- KIT
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- STREET
- TYPE:
- CHAIN COVER
- BASE COLOR:
- SILVER
- COLOR/FINISH:
- POLISHED
- STYLE:
- SOCKET-HEAD
$56.95Qty in Cart: 0Quantity:Price:$56.95Subtotal: -
GARDNER-WESTCOTT Stainless Steel - Primary SP-10-17-08
GARDNER-WESTCOTT
$54.95Protect your engine's critical components with corrosion-resistant stainless steel covers that maintain their finish through years of racing and riding. Gardner-Westcott's U.S.-manufactured primary sets deliver the durability and precision fit that...DS189378- SKU:
- DS189378
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- POLISHED
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- STYLE:
- SOCKET-HEAD
- COLOR/FINISH:
- NATURAL
- COLOR/FINISH:
- SILVER
- MATERIAL:
- STAINLESS STEEL
- BASE COLOR:
- SILVER
- BASE FINISH:
- NATURAL
- PRODUCT NAME:
- BOLT KIT
- TYPE:
- PRIMARY COVER ONLY
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
GARDNER-WESTCOTT Stainless Steel - Primary SP-10-18-08
GARDNER-WESTCOTT
$65.95Protect your motor's critical components with Gardner-Westcott stainless steel covers that resist corrosion and maintain a clean, professional appearance through countless track hours and seasonal storage. These US-manufactured covers are engineered to...DS189377- SKU:
- DS189377
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BASE FINISH:
- NATURAL
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- BOLT KIT
- TYPE:
- PRIMARY COVER ONLY
- BASE COLOR:
- SILVER
- STYLE:
- SOCKET-HEAD
- COLOR/FINISH:
- SILVER
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- POLISHED
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$65.95Qty in Cart: 0Quantity:Price:$65.95Subtotal: -
GARDNER-WESTCOTT Stainless Steel Motor Set SP-88-98
GARDNER-WESTCOTT
$334.95Protect your engine's internals while maintaining factory aesthetics with Gardner-Westcott's stainless steel motor set. Stainless steel construction resists corrosion and oxidation far better than standard covers, ensuring your engine bay looks pristine...DS189372- SKU:
- DS189372
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- BASE COLOR:
- SILVER
- MEASUREMENT SYSTEM:
- SAE
- STYLE:
- SOCKET-HEAD
- BASE FINISH:
- NATURAL
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- BOLT KIT
- COLOR/FINISH:
- POLISHED
- RIDING STYLE:
- STREET
- TYPE:
- MOTOR SET
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- SILVER
- UNITS:
- KIT
$334.95 -
GARDNER-WESTCOTT Stainless Steel Motor Set SP-88-79
GARDNER-WESTCOTT
$284.95If you're rebuilding a motor or completing a comprehensive engine overhaul, sourcing quality covers and mounts individually wastes time and invites fitment inconsistencies. The Gardner-Westcott Stainless Steel Motor Set SP-88-79 consolidates all...DS189370- SKU:
- DS189370
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- RIDING STYLE:
- STREET
- TYPE:
- MOTOR SET
- BASE COLOR:
- SILVER
- BASE FINISH:
- NATURAL
- MEASUREMENT SYSTEM:
- SAE
- PRODUCT NAME:
- BOLT KIT
- STYLE:
- SOCKET-HEAD
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- POLISHED
- COLOR/FINISH:
- SILVER
- UNITS:
- KIT
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STAINLESS STEEL
$284.95
