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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RSD Cam Cover - Clarity - Black Ops - FLH 0177-2005-SMB
RSD
$531.95A quality cam cover does more than protect your engine's internals—it's a statement piece that showcases your build. The RSD Cam Cover - Clarity offers full visibility of your moving components while maintaining the durability and precision fit your...09401130- SKU:
- 09401130
- Availability:
- Ships Same Business Day
- Weight:
- 3.01 LBS
- BASE COLOR:
- BLACK
- BASE COLOR:
- SILVER
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BASE FINISH:
- MATTE
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- MATTE
- MODEL:
- CLARITY
- PRODUCT NAME:
- COVER
- STYLE:
- BLACK OPS™
- TYPE:
- CAM
- UNITS:
- EACH
$531.95 -
RSD Rocker Box - Nostalgia - Contrast Cut - XL 0177-2023-BH
RSD
$690.95The RSD Rocker Box elevates your Harley's top end with precision-machined aesthetics that don't compromise function. This billet aluminum component delivers the contrast cut detailing that sets your build apart while maintaining the durability required...09401143- SKU:
- 09401143
- Availability:
- Ships Same Business Day
- Weight:
- 3.46 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- MODEL:
- NOSTALGIA
- MATERIAL:
- BILLET ALUMINUM
- STYLE:
- CONTRAST CUT™
- TYPE:
- ROCKER BOX
- UNITS:
- PAIR
- PRODUCT NAME:
- COVER
$690.95 -
RSD Rocker Box - Nostalgia - Black Ops - XL 0177-2023-SMB
RSD
$690.95The RSD Rocker Box Nostalgia Black Ops delivers the refined aesthetics of classic design without compromising on modern durability and precision fit. Whether you're building a show-stopping custom or restoring a vintage powerplant, this billet-aluminum...09401144- SKU:
- 09401144
- Availability:
- Ships Same Business Day
- Weight:
- 3.51 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- STYLE:
- BLACK OPS™
- TYPE:
- ROCKER BOX
- UNITS:
- PAIR
- MODEL:
- NOSTALGIA
- RIDING STYLE:
- STREET
$690.95 -
RSD Cam Cover - Clarity - Contrast Cut - M8 0177-2065-BM
RSD
$571.95The RSD Cam Cover – Clarity gives you unobstructed visibility into your M8's internal engine dynamics, letting you monitor cam operation and internal movement in real time. CNC-machined from billet aluminum, this cover delivers the precision fit and...09401729- SKU:
- 09401729
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- MODEL:
- CLARITY
- PRODUCT NAME:
- COVER
- STYLE:
- CONTRAST CUT™
- TYPE:
- CAM
- UNITS:
- EACH
$571.95 -
RSD Cam Cover - Clarity - Contrast Cut - Twin Cam 0177-2003-BM
RSD
$571.95Display the precision engineering of your Twin Cam engine with a cam cover that's as functional as it is striking. The RSD Clarity Contrast Cut design lets you showcase internal moving components while maintaining the durability and protection your...09401057- SKU:
- 09401057
- Availability:
- Ships Same Business Day
- Weight:
- 2.82 LBS
- BASE COLOR:
- BLACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- PRODUCT NAME:
- COVER
- TYPE:
- CAM
- MODEL:
- CLARITY
- STYLE:
- CONTRAST CUT™
- COLOR/FINISH:
- ALUMINUM
- COLOR/FINISH:
- BLACK
$571.95 -
RSD Cam Cover - Clarity - Black Ops - M8 0177-2065-SMB
RSD
$571.95Engine bay aesthetics matter when you're showcasing a precision-built M8. The RSD Cam Cover – Clarity gives you a window into your engine's internal dynamics while maintaining the aggressive, purposeful look that separates a show bike from a show-quality...09401731- SKU:
- 09401731
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- MODEL:
- CLARITY
- PRODUCT NAME:
- COVER
- STYLE:
- BLACK OPS™
- TYPE:
- CAM
- UNITS:
- EACH
$571.95 -
KIBBLEWHITE Valve Seal 71006-4
KIBBLEWHITE
$11.94Valve seal degradation is one of the most common causes of oil consumption and emissions problems in performance engines. The KIBBLEWHITE 71006-4 Valve Seal maintains a reliable barrier between your valve guides and valve stems, even under high heat and...09260794- SKU:
- 09260794
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- MATERIAL:
- PTFE
- TYPE:
- VALVE
- UNITS:
- 4 PACK
- APPLICATION:
- INTAKE
$11.94 -
KIBBLEWHITE Valve Seals 71007-4
KIBBLEWHITE
$11.94Valve seal degradation compromises cylinder pressure and increases blowby, directly impacting power output and engine longevity. KIBBLEWHITE's 71007-4 seals deliver reliable sealing under extreme heat and combustion pressures, eliminating oil migration...09260795- SKU:
- 09260795
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- STREET
- MATERIAL:
- PTFE
- PRODUCT NAME:
- SEAL
- TYPE:
- VALVE
- UNITS:
- 4 PACK
$11.94 -
KB PERFORMANCE Piston Kit - FX/FL KB263.STD
KB PERFORMANCE
$239.95If you're rebuilding a big-twin Harley or pushing your FX/FL platform to the limit, piston quality directly impacts reliability and ring seal under boost or sustained high RPM. KB Performance's hypereutectic aluminum pistons are diamond-machined to...DS751201- SKU:
- DS751201
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.437'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
KB PERFORMANCE Piston Kit - FX/FL KB263.020
KB PERFORMANCE
$239.95If you're building a high-performance engine that demands precision and longevity, KB Performance pistons are engineered to deliver both. These diamond-machined pistons allow for tighter clearances than standard alternatives, which means less piston...DS751204- SKU:
- DS751204
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- BORE SIZE IMPERIAL:
- 3.437'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$239.95 -
KB PERFORMANCE Piston Kit - FX/FL KB263.030
KB PERFORMANCE
$239.95If you're building a high-performance engine that demands precision and reliability, KB Performance pistons are engineered to deliver both. These diamond-machined pistons maintain exceptionally tight tolerances—plus or minus one gram weight variance and...DS751205- SKU:
- DS751205
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.437'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- UNITS:
- KIT
$239.95 -
KB PERFORMANCE Piston Kit - FX/FL KB263.040
KB PERFORMANCE
$239.95If you're rebuilding a Harley-Davidson FX/FL engine and demand precision-fit components that won't compromise reliability, KB Performance pistons are engineered to deliver tighter tolerances and superior ring sealing than standard alternatives. The...DS751206- SKU:
- DS751206
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.040'
- BORE SIZE IMPERIAL:
- 3.437'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
$239.95 -
KB PERFORMANCE Piston Kit - XL KB295.STD
KB PERFORMANCE
$227.95If you're building or rebuilding an engine that demands precision and durability, piston quality directly impacts ring seal, combustion efficiency, and long-term reliability. The KB PERFORMANCE Piston Kit delivers the tight tolerances and superior...DS751235- SKU:
- DS751235
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON HEAD SHAPE:
- FLAT TOP
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$227.95 -
KB PERFORMANCE Piston Kit - XL KB295.020
KB PERFORMANCE
$227.95If you're building or rebuilding a high-performance engine, piston quality directly impacts reliability, ring seal, and longevity under sustained load. KB Performance pistons are precision-engineered to tighter tolerances than OEM or economy...DS751238- SKU:
- DS751238
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
$227.95 -
KB PERFORMANCE Piston Kit KB258.005
KB PERFORMANCE
$233.95If you're building a high-performance engine that demands precision and reliability, KB Performance pistons are engineered to deliver tighter tolerances and superior ring seal compared to standard alternatives. The T-5 hypereutectic aluminum construction...DS751242- SKU:
- DS751242
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 8.6:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$233.95 -
KB PERFORMANCE Piston Kit KB258.010
KB PERFORMANCE
$233.95If you're building or rebuilding an engine that demands precision and reliability, KB Performance pistons are engineered to deliver tighter tolerances and superior ring seal compared to standard alternatives. The diamond-machined construction and...DS751243- SKU:
- DS751243
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 8.6:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.498'
$233.95 -
KB PERFORMANCE Piston Kit KB258.020
KB PERFORMANCE
$233.95KB Performance pistons are engineered for racers and serious engine builders who demand precision and longevity. The T-5 heat-treated 390 hypereutectic aluminum construction allows for tighter piston-to-wall clearances, reducing piston rock and improving...DS751244- SKU:
- DS751244
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- COMPRESSION RATIO IMPERIAL:
- 8.6:1
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.498'
$233.95 -
KB PERFORMANCE Piston Kit KB266.000.3
KB PERFORMANCE
$246.95If you're building or rebuilding a high-performance engine, piston quality directly impacts reliability, ring seal, and overall longevity. KB Performance pistons are diamond-machined to extreme tolerances and manufactured from T-5 heat-treated 390...DS751247- SKU:
- DS751247
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- UNITS:
- KIT
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE SIZE IMPERIAL:
- 3.498'
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$246.95 -
KB PERFORMANCE Piston Kit KB266.005.3
KB PERFORMANCE
$246.95If you're building a high-revving engine that demands precision and durability, KB Performance pistons deliver the tight tolerances and superior ring seal that separate championship builds from the rest. The T-5 hypereutectic aluminum alloy combined with...DS751248- SKU:
- DS751248
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$246.95 -
KB PERFORMANCE Piston Kit KB266.010.3
KB PERFORMANCE
$246.95If you're building a high-compression engine or restoring a classic with modern performance standards, piston quality directly impacts engine longevity and ring seal efficiency. KB Performance pistons are held to one-gram weight tolerances and...DS751249- SKU:
- DS751249
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.498'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$246.95Qty in Cart: 0Quantity:Price:$246.95Subtotal:
