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
S&S CYCLE Cylinder Head Kit - Big Twin 90-1498
S&S CYCLE
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95S&S Cycle's cylinder head kit delivers the flow characteristics and durability demanded by serious Big Twin builders. Whether you're increasing displacement, optimizing combustion chamber design, or restoring a complete top end, these fully assembled...09300009- SKU:
- 09300009
- Availability:
- Ships Same Business Day
- Weight:
- 25.35 LBS
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.500'
- FEATURES:
- SINGLE SPARK PLUG
- PRODUCT NAME:
- CYLINDER HEAD KIT
- STYLE:
- STOCK COMPRESSION
- UNITS:
- KIT
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95 -
JE PISTONS Piston Kit - 95" - Twin Cam 324720
JE PISTONS
$472.99When you're pushing your Twin Cam to the limit, your pistons need to withstand extreme pressures and temperatures without compromise. JE Pistons' 95" kit is engineered from 2618-T6 forged aluminum—a material proven in professional competition—delivering...09105936- SKU:
- 09105936
- Availability:
- Ships Same Business Day
- Weight:
- 3.90 LBS
$472.99 -
KB PERFORMANCE Piston Kit - Standard - M8 KB595LCA.STD
KB PERFORMANCE
$446.95If you're rebuilding an M8 engine, piston quality directly impacts reliability, ring seal, and combustion efficiency. The KB Performance Standard kit delivers forged 4032 aluminum construction with a proven offset pin design that reduces noise while...09106403- SKU:
- 09106403
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
$446.95 -
KB PERFORMANCE Piston Kit - +.005" - M8 KB595LCA.005
KB PERFORMANCE
$446.95Engine wear and carbon buildup reduce compression and power output—a quality piston kit restores your engine to peak performance. The KB PERFORMANCE KB595LCA.005 delivers precision-forged reliability for +.005" overbore applications, whether you're...09106404- SKU:
- 09106404
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
$446.95 -
KB PERFORMANCE Piston Kit - Standard - M8 KB596LCA.STD
KB PERFORMANCE
$446.95A quality piston kit is fundamental to engine longevity and performance—this KB Performance set delivers the durability and precision needed for a reliable rebuild. The 4032 aluminum alloy construction resists thermal stress and wear, while the offset...09106405- SKU:
- 09106405
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
$446.95 -
KB PERFORMANCE Piston Kit - +.005" - M8 KB596LCA.005
KB PERFORMANCE
$446.95Engine rebuilds demand precision components that deliver consistent performance and reliability. This KB Performance piston kit provides the durability and smooth operation your M8 engine needs, whether you're restoring to factory specs or preparing for...09106406- SKU:
- 09106406
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
$446.95 -
KIBBLEWHITE Cast Iron Valve Seat - Exhaust - Evolution 10-SC446
KIBBLEWHITE
$10.87A quality exhaust valve seat is fundamental to cylinder head integrity and engine longevity. The KIBBLEWHITE Cast Iron Valve Seat for Evolution engines delivers superior machinability and wear resistance, ensuring consistent sealing and thermal...09260325- SKU:
- 09260325
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$10.87 -
KIBBLEWHITE Exhaust Valve 20-21063K
KIBBLEWHITE
$41.29Exhaust valves endure extreme heat cycling and aggressive combustion pressures—failure here means catastrophic engine damage and downtime. The Kibblewhite White Diamond exhaust valve delivers the thermal stability and durability demanded by serious...09263346- SKU:
- 09263346
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$41.29 -
KIBBLEWHITE Intake Valve 20-21061H
KIBBLEWHITE
$32.78A quality intake valve is critical to your engine's breathing efficiency and longevity. Kibblewhite's White Diamond valves are CNC-machined from premium EV8 stainless steel or Inconel-751, then electroplated with a hard chrome finish that resists heat...09263344- SKU:
- 09263344
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$32.78 -
On Sale
S&S CYCLE Viton O-Ring 50-8046
S&S CYCLE
MSRP: $9.95Now: $8.96Was: $9.95Carburetor sealing integrity is non-negotiable when you're dialing in air-fuel mixture on a precision engine. The S&S Cycle Viton O-Ring 50-8046 is the OEM-grade replacement that ensures a leak-free seal on Super E & G carburetors, eliminating vacuum...10500343- SKU:
- 10500343
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $9.95Now: $8.96Was: $9.95 -
On Sale
S&S CYCLE Top End Kit - Big Twin 90-0097
S&S CYCLE
MSRP: $3,659.95Now: $3,293.96Was: $3,659.95A top-end rebuild is one of the most cost-effective ways to restore lost compression and reclaim performance in a Big Twin engine. The S&S Cycle Top End Kit eliminates guesswork by bundling everything you need—pre-fitted pistons, quality cylinder heads,...09031269- SKU:
- 09031269
- Availability:
- Ships Same Business Day
- Weight:
- 61.50 LBS
MSRP: $3,659.95Now: $3,293.96Was: $3,659.95 -
On Sale
S&S CYCLE Pinion Gear - Standard - M8 330-0622
S&S CYCLE
MSRP: $131.95Now: $118.76Was: $131.95If you're upgrading to a gear-driven cam system on your M8 Harley-Davidson, you'll need a properly matched pinion gear to ensure reliable valve train operation and correct gear lash. This S&S Cycle pinion gear is engineered to work in tandem with...09500864- SKU:
- 09500864
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $131.95Now: $118.76Was: $131.95 -
On Sale
S&S CYCLE Silicone O-Ring - 50-8009 50-8009
S&S CYCLE
MSRP: $6.95Now: $6.26Was: $6.95Carburetor sealing integrity is critical to consistent fuel delivery and engine performance, and a worn or degraded o-ring compromises both. The S&S Cycle 50-8009 silicone o-ring is engineered to maintain reliable sealing in Super E and G carburetors,...09350864- SKU:
- 09350864
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $6.95Now: $6.26Was: $6.95 -
On Sale
WISECO Piston Kit - M8 K2805
WISECO
MSRP: $576.95Now: $446.00Was: $576.95The WISECO M8 K2805 Piston Kit delivers the reliability and performance demanded by serious M8 builders. With ArmorX coating protecting against extreme combustion temperatures and ArmorFit skirt coating eliminating the need for manual clearance...09031679- SKU:
- 09031679
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
MSRP: $576.95Now: $446.00Was: $576.95 -
On Sale
S&S CYCLE Flywheel Assembly 320-0598
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95A flywheel assembly is the foundation of reliable engine performance—it stores rotational energy, ensures smooth power delivery, and directly impacts your engine's longevity. S&S Cycle's 320-0598 is engineered for both stock applications and...09220163- SKU:
- 09220163
- Availability:
- Ships Same Business Day
- Weight:
- 43.50 LBS
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Qty in Cart: 0Quantity:Price:MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Subtotal: -
SLYFOX Timing Cover - Gloss - M8 12056G
SLYFOX
$64.95Engine bay aesthetics matter when you're running a high-performance build, but a timing cover does far more than look good—it protects critical timing components from debris, heat, and contamination while reducing unwanted vibration. The SLYFOX Timing...09402029- SKU:
- 09402029
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$64.95 -
KLOCK WERKS Oil Cooler Guard - Black - M8 Touring KWS-01-0615-B
KLOCK WERKS
$64.95Your M8 Touring's oil cooler area deserves the same attention to detail as the rest of your bagger. The KLOCK WERKS Oil Cooler Guard delivers a polished, factory-finished look using materials that match your existing Klock Werks vent screens—no...07130255- SKU:
- 07130255
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$64.95 -
KLOCK WERKS Oil Cooler Guard - Chrome - M8 Touring KWS-01-0615-C
KLOCK WERKS
$64.95The oil cooler area is often an overlooked detail on M8 Touring models, but it's one of the most visible components in your engine bay. The KLOCK WERKS Oil Cooler Guard elevates that space with a chrome-finished guard that matches the aesthetic of...07130256- SKU:
- 07130256
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$64.95 -
KLOCK WERKS Oil Cooler Guard - Black - M8 Softail KWS-02-0616-B
KLOCK WERKS
$64.95Your M8 Softail's oil cooler area deserves attention to detail that matches the rest of your build. The KLOCK WERKS Oil Cooler Guard delivers a cohesive, finished appearance while protecting a critical component with coordinated styling that complements...07130257- SKU:
- 07130257
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
$64.95 -
KLOCK WERKS Oil Cooler Guard - Chrome - M8 Softail KWS-02-0616-C
KLOCK WERKS
$64.95Your M8 Softail's oil cooler area deserves visual polish that matches the quality of your machine. The KLOCK WERKS Oil Cooler Guard delivers that missing aesthetic detail while protecting a critical component from road debris and impact damage...07130258- SKU:
- 07130258
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal:
