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
-
FEULING OIL PUMP CORP. Reaper Camshaft - Chain Drive - 487 Series - M8 1354
FEULING OIL PUMP CORP.
$319.95If you're running a 4.25" stroke M8 big twin with displacement between 114" and 117", the Feuling Reaper Camshaft delivers the aggressive lift and duration you need for serious street and strip performance without requiring expensive valve spring...09251609- SKU:
- 09251609
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
$319.95 -
FEULING OIL PUMP CORP. Inner Cam Bearings - 20 Pack - Twin Cam 2083
FEULING OIL PUMP CORP.
$289.95If you're pushing your Twin Cam engine to its limits, stock cam bearings simply won't cut it. These heavy-duty full-complement inner cam bearings are engineered to handle the sustained high-load demands of performance and racing applications. When you...09251610- SKU:
- 09251610
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
$289.95 -
FEULING OIL PUMP CORP. Inner Cam Bearings - 20 Pack - Twin Cam | M8 2084
FEULING OIL PUMP CORP.
$379.95High-performance Twin Cam engines demand cam bearing reliability that factory components simply can't deliver under sustained load and aggressive tuning. These Feuling heavy-duty cam bearings are engineered to handle the elevated pressures of forced...09251611- SKU:
- 09251611
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
$379.95 -
FEULING OIL PUMP CORP. Replacement Tensioner Pad - M8 8070
FEULING OIL PUMP CORP.
$29.95Chain tensioner pads wear under constant load and friction, compromising the precise tension your timing chain demands for reliable performance. This OEM-compatible replacement from Feuling restores proper chain control without requiring a complete...09251612- SKU:
- 09251612
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$29.95 -
FEULING OIL PUMP CORP. Hydraulic Tensioner - M8 8084
FEULING OIL PUMP CORP.
$119.95Harley-Davidson M8 engines demand precise camchain management to maintain reliability and performance. A worn or failing hydraulic tensioner compromises valve timing and risks catastrophic engine damage. Feuling's purpose-built M8 tensioner restores...09251613- SKU:
- 09251613
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$119.95 -
FEULING OIL PUMP CORP. Solid Lifters - Race Series - Oversize - Twin Cam | XL | Buell | M8 4056
FEULING OIL PUMP CORP.
$299.95If you're running a radical cam with aggressive valve spring pressures, stock lifters will cost you performance and reliability. Feuling's Solid Lifters eliminate valve float at high RPM, maintain precise valve lift, and deliver measurable gains in...09290090- SKU:
- 09290090
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
$299.95 -
FEULING OIL PUMP CORP. Solid Lifters - Race Series - Oversize - Twin Cam | XL | Buell | M8 4057
FEULING OIL PUMP CORP.
$299.95If you're running radical valve spring pressures and aggressive lift profiles on your Twin Cam, XL, Buell, or M8 engine, valve float will kill your power gains and reliability. Feuling's Solid Lifters eliminate deflection under extreme RPM conditions,...09290091- SKU:
- 09290091
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
$299.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.003" - M8 1227
FEULING OIL PUMP CORP.
$119.95Excessive rocker arm end play doesn't just create noise—it degrades oil pressure distribution and accelerates wear on your cylinder head's thrust surfaces. Feuling's hardened rocker shaft shims restore the critical 0.0035"-0.005" clearance window that...09300246- SKU:
- 09300246
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$119.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.010" - M8 1229
FEULING OIL PUMP CORP.
$99.95Excessive rocker arm end play doesn't just create noise—it degrades oil pressure consistency and accelerates wear on your cylinder head's thrust surfaces. The Feuling 0.010" M8 Rocker Shaft Shim solves this by precisely controlling side clearance to...09300248- SKU:
- 09300248
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$99.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.005" - M8 1228
FEULING OIL PUMP CORP.
$99.95Excessive rocker arm end play causes valve train noise, oil starvation, and accelerated wear on your cylinder head—especially on M8 heads prone to standoff damage. These hardened shims restore precise clearance to Feuling's recommended 0.0035"–0.005"...09300247- SKU:
- 09300247
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$99.95 -
THRASHIN SUPPLY CO. Cam Cover - Gen 2 - Smooth - Black - M8 TSC-3028-1
THRASHIN SUPPLY CO.
$109.95A properly fitted cam cover protects your engine's valve train from contamination while maintaining clean aesthetics on your M8. The THRASHIN SUPPLY CO. Gen 2 delivers a slim profile and cut-away corner design that clears modern floorboards without...09402218- SKU:
- 09402218
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$109.95 -
THRASHIN SUPPLY CO. Cam Cover - Gen 2 - Smooth - Chrome - M8 TSC-3028-3
THRASHIN SUPPLY CO.
$119.95A cam cover serves as both a functional engine component and a visual centerpiece on your M8's top end. This Thrashin Supply Co. Gen 2 design combines practical engineering—slim profile and cut-away corner for real floorboard clearance—with the clean...09402219- SKU:
- 09402219
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
THRASHIN SUPPLY CO. Cam Cover - Gen 2 - Finned - Chrome - M8 TSC-3029-3
THRASHIN SUPPLY CO.
$129.95A cam cover isn't just a cosmetic piece—it protects your engine's valvetrain while adding visual definition to your top end. The Thrashin Supply Co. Gen 2 Finned cam cover delivers clean styling with practical engineering, featuring a slim profile and...09402220- SKU:
- 09402220
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$129.95Qty in Cart: 0Quantity:Price:$129.95Subtotal: -
THRASHIN SUPPLY CO. Cam Cover - Gen 2 - Finned - Twice Cut - Black - M8 TSC-3029-4
THRASHIN SUPPLY CO.
$119.95A cam cover is more than just a dress-up piece—it protects your engine's valve train while managing heat dissipation and maintaining a clean engine bay aesthetic. The Thrashin Supply Co. Gen 2 Finned design combines functional cooling fins with a slim...09402221- SKU:
- 09402221
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$119.95 -
SLYFOX Pushrod Covers - Carbon Fiber - M8 1012-PCXC
SLYFOX
$341.38Pushrod covers are often overlooked, but they're critical for engine longevity and appearance. SLYFOX's carbon fiber construction protects your pushrods from heat cycling, debris, and oil contamination while shedding unnecessary weight. If you're...09280123- SKU:
- 09280123
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$341.38 -
DRAG SPECIALTIES Oil Line - Feed - Softail T03-0160
DRAG SPECIALTIES
$44.47A properly functioning oil feed line is critical to maintaining adequate lubrication pressure throughout your Softail's engine and transmission system. Over time, factory lines can crack, harden, or fail—leading to catastrophic engine damage. The Drag...07110241- SKU:
- 07110241
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- LINE
- BASE COLOR:
- BLACK
- RIDING STYLE:
- STREET
- TYPE:
- FEED LINE
- TYPE:
- OIL
- UNITS:
- EACH
$44.47 -
DRAG SPECIALTIES Oil Line - Return - Softail T03-0162
DRAG SPECIALTIES
$111.25A properly functioning oil return line is critical for maintaining consistent engine lubrication and preventing oil starvation in high-performance applications. This Drag Specialties return line is engineered to OEM specifications for your Softail,...07110242- SKU:
- 07110242
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- LINE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- TYPE:
- RETURN LINE
- BASE COLOR:
- BLACK
$111.25 -
DRAG SPECIALTIES Oil Line - Return - Softail T03-0161
DRAG SPECIALTIES
$114.43A quality oil return line is critical for maintaining proper engine lubrication and preventing oil starvation in high-performance applications. This Drag Specialties return line is engineered to deliver consistent oil flow back to the reservoir, ensuring...07110243- SKU:
- 07110243
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- LINE
- BASE COLOR:
- BLACK
- TYPE:
- RETURN LINE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$114.43 -
DRAG SPECIALTIES Oil Line - Vent - Softail T03-0163
DRAG SPECIALTIES
$93.23A properly functioning vent line is critical to maintaining correct crankcase pressure and preventing oil seepage in your Softail. This DRAG Specialties vent line delivers reliable performance and durability, ensuring your engine breathes correctly and...07110244- SKU:
- 07110244
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- LINE
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- TYPE:
- VENT LINE
- BASE COLOR:
- BLACK
- UNITS:
- EACH
$93.23 -
DRAG SPECIALTIES Elbow - Oil Drain - Softail T03-0154
DRAG SPECIALTIES
$7.37A quality oil drain elbow is essential for maintaining proper oil circulation and preventing leaks at critical connection points in your Softail's engine. This Drag Specialties elbow ensures a secure, factory-correct fit while supporting reliable engine...07110245- SKU:
- 07110245
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- ELBOW
- UNITS:
- EACH
- BASE COLOR:
- BLACK
$7.37
