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!
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On Sale
GOODRIDGE Universal Fuel Line - Stainless Steel - 20" VTOL-020C-CL
GOODRIDGE
MSRP: $73.95Now: $66.56Was: $73.95Fuel system reliability is non-negotiable in high-performance racing and modified engines. The GOODRIDGE Universal Fuel Line eliminates the guesswork with pre-assembled, stainless steel construction that withstands aggressive fuel delivery demands while...07110257- SKU:
- 07110257
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $73.95Now: $66.56Was: $73.95 -
On Sale
GOODRIDGE Universal Fuel Line - Stainless Steel - 21" VTOL-021C-CL
GOODRIDGE
MSRP: $75.95Now: $68.36Was: $75.95Fuel system reliability is non-negotiable in high-performance applications, and OEM fuel lines often fail under sustained boost or aggressive driving conditions. The GOODRIDGE Universal Fuel Line eliminates that vulnerability with stainless steel...07110258- SKU:
- 07110258
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $75.95Now: $68.36Was: $75.95 -
On Sale
GOODRIDGE Universal Fuel Line - Stainless Steel - 24" VTOL-024C-CL
GOODRIDGE
MSRP: $77.95Now: $70.16Was: $77.95Fuel line integrity is non-negotiable in high-performance applications—a failure mid-race costs you more than just time. The GOODRIDGE Universal Fuel Line delivers stainless steel construction with pre-assembled AN6 swivels, eliminating guesswork and...07110259- SKU:
- 07110259
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
MSRP: $77.95Now: $70.16Was: $77.95 -
On Sale
GOODRIDGE Universal Fuel Line - Stainless Steel - 26" VTOL-026C-CL
GOODRIDGE
MSRP: $79.95Now: $71.96Was: $79.95A quality fuel line is the backbone of any reliable fuel system—and this GOODRIDGE universal line eliminates guesswork with pre-assembled stainless steel swivels and PTFE-lined construction that handles both street and racing applications. Whether you're...07110260- SKU:
- 07110260
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
MSRP: $79.95Now: $71.96Was: $79.95 -
JE PISTONS Piston Kit - 4.250" - M8 394138
JE PISTONS
$729.99High-boost and high-RPM applications demand pistons engineered to withstand extreme pressures without sacrificing reliability. The JE 394138 combines advanced forging technology with precision engineering to deliver the strength-to-weight ratio serious...09106856- SKU:
- 09106856
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
$729.99 -
JE PISTONS Piston Kit - 4.310" - M8 394139
JE PISTONS
$729.99If you're running boost or pushing high RPMs, your factory pistons aren't going to cut it. JE Pistons' 4.310" kit combines cutting-edge forging technology with precision engineering to deliver the strength, durability, and lightweight performance your...09106857- SKU:
- 09106857
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
$729.99 -
JE PISTONS Piston Kit - 4.320" - M8 394140
JE PISTONS
$694.99High-RPM and high-boost applications demand pistons that can withstand extreme pressure cycles without sacrificing reliability. The JE PISTONS 4.320" M8 kit delivers the strength-to-weight ratio and thermal management required for sustained performance,...09106858- SKU:
- 09106858
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
$694.99 -
JE PISTONS Piston Kit - 4.250" - M8 391731
JE PISTONS
$694.99High-boost and high-RPM applications demand pistons engineered to withstand extreme combustion pressures and thermal stress—stock units simply won't survive. The JE Piston Kit 4.250" delivers the strength-to-weight ratio and reliability required for...09106859- SKU:
- 09106859
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
$694.99 -
JE PISTONS Piston Kit - 4.310" - M8 394100
JE PISTONS
$729.99High-RPM and high-boost applications demand pistons engineered to withstand extreme pressures without sacrificing reliability. The JE PISTONS 4.310" M8 Kit delivers the strength and precision necessary to maintain ring seal and power output at the edge...09106860- SKU:
- 09106860
- Availability:
- Ships Same Business Day
- Weight:
- 3.45 LBS
$729.99 -
JE PISTONS Piston Kit - 4.320" - M8 391730
JE PISTONS
$729.99High-boost and high-RPM environments demand pistons engineered for extreme durability and consistent ring seal—this JE Piston Kit delivers both through proprietary grain flow forging and precision internal bracing. Whether you're building a competition...09106861- SKU:
- 09106861
- Availability:
- Ships Same Business Day
- Weight:
- 3.47 LBS
$729.99 -
KIBBLEWHITE Beehive Spring Kit - 0.640" Lift - Titanium - M8 | CVO 20-24350
KIBBLEWHITE
$635.42If you're running a modern Harley-Davidson CVO and want to maximize valve lift and engine responsiveness, a high-quality beehive spring kit is non-negotiable. Kibblewhite's titanium retainer design eliminates keeper pull-through and ensures rock-solid...09263457- SKU:
- 09263457
- Availability:
- Ships Same Business Day
- Weight:
- 0.99 LBS
$635.42 -
KIBBLEWHITE Beehive Spring Kit - 0.640" Lift - H.T. Steel - M8 | CVO 20-24400
KIBBLEWHITE
$539.95If you're running a 2023-2024 CVO and want to maximize valve lift without compromising reliability, the Kibblewhite Beehive Spring Kit delivers the precision engineering and durability required for serious performance builds. These progressively wound...09263458- SKU:
- 09263458
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
$539.95 -
Wossner Piston Kit 4.375" Stroke 107 CID M8 2017-2024 Harley-Davidson Softail Low Rider ST FXLRST K4081DA-2
WOSSNER
$448.00When you're pushing your M8 to its limits, stock pistons become your bottleneck. The Wossner Piston Kit delivers thermal management and durability engineered to handle sustained high-load conditions, keeping your 107 CID running cooler and stronger. This...09106681- SKU:
- 09106681
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
$448.00 -
Wossner Piston Kit 4.500" Stroke 114 CID M8 CVO 2017-2024 K4082D200-2
WOSSNER
$448.00If you're running a high-displacement M8 CVO engine, piston durability and thermal management directly impact your power output and engine longevity. Wossner's hardcoat anodized pistons are engineered to handle extreme combustion pressures while...09106682- SKU:
- 09106682
- Availability:
- Ships Same Business Day
- Weight:
- 3.03 LBS
$448.00 -
Wossner Piston Kit 4.375" Stroke 117 CID M8 Softail Low Rider ST 2022-2024 K4084D478-2
WOSSNER
$448.00Stock pistons can't handle the demands of high-performance M8 engines—thermal stress, ring wear, and reliability issues will eventually catch up with you. The Wossner Piston Kit delivers OEM-grade construction with hardcoat anodizing that improves heat...09106683- SKU:
- 09106683
- Availability:
- Ships Same Business Day
- Weight:
- 3.22 LBS
$448.00 -
Wossner Piston Kit 4.375" Stroke 119 CID 2017-2024 Harley-Davidson Softail Low Rider ST FXLRST K4074D554-2
WOSSNER
$448.00If you're running a 119 CID M8 in your 2017-2024 Softail Low Rider ST, piston durability and thermal management directly impact your engine's reliability under sustained load. Wossner's hardcoat anodized design handles the extreme combustion temperatures...09106684- SKU:
- 09106684
- Availability:
- Ships Same Business Day
- Weight:
- 3.24 LBS
$448.00 -
Wossner Piston Kit 4.500" Stroke 120 CID M8 CVO Road Glide Limited 2022-2023 K4083D478-2
WOSSNER
$448.00If you're running a 120 CID M8 CVO and demand reliable performance under sustained high RPM loads, a quality piston kit is non-negotiable. Wossner's hardcoat anodized design manages extreme combustion temperatures while reducing ring groove wear—giving...09106685- SKU:
- 09106685
- Availability:
- Ships Same Business Day
- Weight:
- 3.13 LBS
$448.00 -
On Sale
S&S CYCLE Piston Cooling Jet Kit - Twin Cam 310-1251
S&S CYCLE
MSRP: $89.95Now: $80.96Was: $89.95Piston cooling directly impacts engine longevity and reliability—especially under sustained high-RPM operation where stock cooling jets often fall short. The S&S Cycle Piston Cooling Jet Kit delivers optimized spray patterns and dual-jet geometry to...09501040- SKU:
- 09501040
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
MSRP: $89.95Now: $80.96Was: $89.95 -
FEULING OIL PUMP CORP. Cam Chain Tensioner - Billet - M8 8073
FEULING OIL PUMP CORP.
$79.95Factory cam chain tensioners are cast units prone to wear and inconsistent pressure delivery, which can lead to timing irregularities and premature chain stretch. The Feuling Oil Pump Corp. Billet Cam Chain Tensioner replaces that weak link with...09251607- SKU:
- 09251607
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$79.95 -
FEULING OIL PUMP CORP. Reaper Camshaft - Chain Drive - 618 Series - M8 1352
FEULING OIL PUMP CORP.
$359.95The Feuling Reaper Camshaft is engineered for racers pushing beyond stock performance limits. This aggressive cam profile demands precision tuning and supporting modifications to unlock its full potential—designed specifically for high-RPM racing...09251608- SKU:
- 09251608
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
$359.95
