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 Rocker Box Gasket Kit 90-4091
S&S CYCLE
MSRP: $91.95Now: $82.76Was: $91.95A leaking rocker box gasket compromises engine sealing and can lead to oil contamination and performance degradation. This complete S&S Cycle gasket kit eliminates guesswork by providing all necessary gaskets and O-rings for both rocker boxes in one...904091- SKU:
- 904091
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ROCKER BOX
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
MSRP: $91.95Now: $82.76Was: $91.95 -
On Sale
S&S CYCLE Die Cast Rocker Box - Evolution 90-4095
S&S CYCLE
MSRP: $1,279.95Now: $1,151.96Was: $1,279.95If you're rebuilding or upgrading your Evolution engine, quality rocker boxes are fundamental to reliable valve train operation and oil containment. S&S Cycle's die-cast rocker boxes deliver a positive O-ring seal that eliminates leaks while maintaining...904095- SKU:
- 904095
- Availability:
- Ships Same Business Day
- Weight:
- 12.28 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- PAIR
- BASE FINISH:
- CHROME
- MATERIAL:
- DIE-CAST
- PRODUCT NAME:
- ROCKER BOX
- RIDING STYLE:
- STREET
MSRP: $1,279.95Now: $1,151.96Was: $1,279.95 -
On Sale
S&S CYCLE Die Cast Rocker Box - Twin Cam 90-4110
S&S CYCLE
MSRP: $1,091.95Now: $982.76Was: $1,091.95A quality rocker box is fundamental to engine reliability and oil circulation in Twin Cam applications. S&S Cycle's die-cast design delivers a positive O-ring seal that eliminates leaks while maintaining the clean aesthetics of a custom build. Most...904110- SKU:
- 904110
- Availability:
- Ships Same Business Day
- Weight:
- 12.45 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- ROCKER BOX
- RIDING STYLE:
- STREET
- MATERIAL:
- DIE-CAST
- UNITS:
- PAIR
MSRP: $1,091.95Now: $982.76Was: $1,091.95 -
On Sale
S&S CYCLE Rocker Box Gasket Kit 90-4111
S&S CYCLE
MSRP: $71.95Now: $64.76Was: $71.95Rocker box gasket failure is one of the most common sources of oil leaks on Harley-Davidson engines, and even minor seepage compromises engine cleanliness and performance. The S&S Cycle 90-4111 kit eliminates guesswork by providing all gaskets and...904111- SKU:
- 904111
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- FEATURES:
- FOR '99 - '17 TWIN CAM S&S ROCKER BOX
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
MSRP: $71.95Now: $64.76Was: $71.95 -
On Sale
S&S CYCLE Piston Kit 92-1060
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're building a big-bore Evolution engine, piston quality directly impacts reliability, power delivery, and longevity under high RPM conditions. S&S Cycle forged pistons are engineered to handle the demands of a stroker build, delivering superior...921060- SKU:
- 921060
- Availability:
- Ships Same Business Day
- Weight:
- 2.78 LBS
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 88'
- BORE SIZE IMPERIAL:
- 3.625'
- DISPLACEMENT:
- 93'
- DISPLACEMENT:
- 96'
- TYPE:
- REPLACEMENT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH IMPERIAL:
- 4-5/8'
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1061
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're building a big-bore Evolution engine, piston quality directly impacts reliability, ring sealing, and peak horsepower. S&S forged pistons are engineered to handle the increased displacement and combustion pressures of a stroker kit without...921061- SKU:
- 921061
- Availability:
- Ships Same Business Day
- Weight:
- 2.78 LBS
- DISPLACEMENT:
- 88'
- BORE - OVERSIZE:
- +0,010'
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH IMPERIAL:
- 4-5/8'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.625'
- DISPLACEMENT:
- 93'
- DISPLACEMENT:
- 96'
- TYPE:
- REPLACEMENT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1062
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're building a big bore hot setup for your Evolution big twin, these forged S&S pistons are the foundation of reliable, high-rpm performance. Engineered specifically for S&S cylinder heads and a range of stroke configurations, they deliver the...921062- SKU:
- 921062
- Availability:
- Ships Same Business Day
- Weight:
- 2.78 LBS
- BORE - OVERSIZE:
- +0,020'
- BORE SIZE IMPERIAL:
- 3.625'
- DISPLACEMENT:
- 88'
- DISPLACEMENT:
- 96'
- TYPE:
- REPLACEMENT
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 93'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-5/8'
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1400
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running an 883cc or 1200cc Big Twin and want genuine displacement gains without a complete engine rebuild, the S&S CYCLE 92-1400 Piston Kit delivers a straightforward path to 1250cc. These cast flat-topped pistons are engineered to work with...921400- SKU:
- 921400
- Availability:
- Ships Same Business Day
- Weight:
- 3.10 LBS
- BORE SIZE IMPERIAL:
- 4.000'
- DISPLACEMENT:
- 100'
- PISTON HEAD SHAPE:
- FLAT TOP
- DISPLACEMENT:
- 107'
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- TYPE:
- REPLACEMENT
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1401
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running an 883cc or 1200cc Big Twin and want real displacement gains without a complete engine overhaul, the S&S CYCLE Piston Kit 92-1401 delivers a straightforward path to 1250cc performance. This cast flat-topped design maximizes compression...921401- SKU:
- 921401
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 4.000'
- DISPLACEMENT:
- 100'
- DISPLACEMENT:
- 107'
- PISTON MATERIAL:
- FORGED
- PISTON HEAD SHAPE:
- FLAT TOP
- BORE - OVERSIZE:
- +0,010'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- TYPE:
- REPLACEMENT
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1402
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running a Big Twin and want meaningful displacement gains without a complete engine rebuild, the S&S CYCLE 92-1402 piston kit delivers a straightforward path to 1250cc power. By increasing swept volume from your stock 883cc or 1200cc engine,...921402- SKU:
- 921402
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- DISPLACEMENT:
- 107'
- PISTON HEAD SHAPE:
- FLAT TOP
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- BORE SIZE IMPERIAL:
- 4.000'
- DISPLACEMENT:
- 100'
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +0,020'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- TYPE:
- REPLACEMENT
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1410
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running an 883cc or 1200cc Big Twin and want genuine displacement gains without an engine swap, the S&S CYCLE Piston Kit 92-1410 is your direct path to 1250cc. This kit delivers measurable increases in power and torque by optimizing bore size...921410- SKU:
- 921410
- Availability:
- Ships Same Business Day
- Weight:
- 3.10 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- FORGED
- BORE SIZE IMPERIAL:
- 4.000'
- PISTON HEAD SHAPE:
- FLAT TOP
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- DISPLACEMENT:
- 113'
- TYPE:
- REPLACEMENT
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1411
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running an 883cc or 1200cc Big Twin and want genuine displacement gains without a complete engine overhaul, the S&S Cycle Piston Kit 92-1411 delivers a straightforward path to 1250cc. This cast flat-top design is engineered for reliability...921411- SKU:
- 921411
- Availability:
- Ships Same Business Day
- Weight:
- 3.10 LBS
- BORE SIZE IMPERIAL:
- 4.000'
- DISPLACEMENT:
- 113'
- PISTON HEAD SHAPE:
- FLAT TOP
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,010'
- TYPE:
- REPLACEMENT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-1412
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95Building a high-compression engine requires precision-engineered pistons that can handle extreme pressure and heat cycles without compromise. The S&S Cycle Piston Kit 92-1412 delivers the exact geometry and material quality needed for reliable power...921412- SKU:
- 921412
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- PISTON HEAD SHAPE:
- FLAT TOP
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- BORE - OVERSIZE:
- +0,020'
- BORE SIZE IMPERIAL:
- 4.000'
- DISPLACEMENT:
- 113'
- TYPE:
- REPLACEMENT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Oil Pump with Gears - Big Twin 31-6296
S&S CYCLE
MSRP: $715.95Now: $644.36Was: $715.95An S&S Cycle oil pump upgrade is essential for Big Twin engines that demand reliable, consistent oil delivery under sustained performance conditions. This complete kit eliminates the limitations of OEM pump design with a refined internal geometry and...09320151- SKU:
- 09320151
- Availability:
- Ships Same Business Day
- Weight:
- 3.51 LBS
- FLOW RATE:
- STANDARD
- PRODUCT NAME:
- PUMP
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- KIT
MSRP: $715.95Now: $644.36Was: $715.95 -
On Sale
S&S CYCLE Oil Pump Rebuild Kit - Standard 31-6278
S&S CYCLE
MSRP: $39.95Now: $35.96Was: $39.95If your S&S oil pump is showing signs of wear—delayed oil pressure, inconsistent delivery, or internal leakage—a full rebuild restores reliable lubrication and protects your engine from catastrophic damage. This master rebuild kit contains all necessary...09320168- SKU:
- 09320168
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- OIL PUMP
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
S&S CYCLE Plug - 1/8" NPT - 10 Pack 50-1015
S&S CYCLE
MSRP: $15.95Now: $14.36Was: $15.95If you're rebuilding or servicing a Big Twin or XL Harley-Davidson engine, you need reliable OEM-specification plugs that won't leak or fail under pressure. S&S Cycle's 1/8" NPT plugs are precision-manufactured replacements that maintain proper oil...09320169- SKU:
- 09320169
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- FEATURES:
- NON MAGNETIC
- PRODUCT NAME:
- PLUG
MSRP: $15.95Now: $14.36Was: $15.95 -
On Sale
S&S CYCLE Elbow - 45 Degree - 1/4" NPT 50-8113
S&S CYCLE
MSRP: $15.95Now: $14.36Was: $15.95If your S&S Cycle oil pump system has a damaged or worn 45-degree elbow fitting, this OEM replacement is essential to maintain proper oil flow and prevent costly system failures. This precision-engineered component ensures reliable hydraulic connections...09320170- SKU:
- 09320170
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- -
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- FITTING
- TYPE:
- OIL LINE
- UNITS:
- EACH
MSRP: $15.95Now: $14.36Was: $15.95 -
On Sale
S&S CYCLE Magnetic Plug - 1/8" NPT 50-8334
S&S CYCLE
MSRP: $15.95Now: $14.36Was: $15.95Magnetic drain plugs are essential for monitoring engine health and extending oil system longevity. This S&S Cycle replacement captures ferrous particles before they circulate through your lubrication system, giving you early warning of internal wear. A...09320171- SKU:
- 09320171
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- PLUG
- TYPE:
- OIL PUMP
- UNITS:
- EACH
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- STREET
MSRP: $15.95Now: $14.36Was: $15.95Qty in Cart: 0Quantity:Price:MSRP: $15.95Now: $14.36Was: $15.95Subtotal: -
On Sale
S&S CYCLE Check Valve Ball 50-8091
S&S CYCLE
MSRP: $4.95Now: $4.46Was: $4.95A properly functioning oil pump is critical to engine longevity, and the check valve ball is the component that ensures consistent oil pressure and prevents backflow. If your Harley-Davidson is experiencing low oil pressure, irregular pump operation, or...09320173- SKU:
- 09320173
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- CHECK VALVE
- PRODUCT NAME:
- BALL
MSRP: $4.95Now: $4.46Was: $4.95Qty in Cart: 0Quantity:Price:MSRP: $4.95Now: $4.46Was: $4.95Subtotal: -
On Sale
S&S CYCLE Supply Idler Gear 31-6016
S&S CYCLE
MSRP: $40.95Now: $36.86Was: $40.95The S&S Cycle Supply Idler Gear 31-6016 is essential maintenance for Big Twin engines, ensuring consistent oil circulation and preventing premature wear on your oil pump system. A worn or damaged idler gear compromises lubrication efficiency, risking...09320200- SKU:
- 09320200
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- IDLER
- TYPE:
- OIL PUMP
- TYPE:
- SUPPLY
- PRODUCT NAME:
- GEAR
- UNITS:
- EACH
MSRP: $40.95Now: $36.86Was: $40.95Qty in Cart: 0Quantity:Price:MSRP: $40.95Now: $36.86Was: $40.95Subtotal:
