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 Pinion Gear 33-4144
S&S CYCLE
MSRP: $112.95Now: $101.66Was: $112.95A quality pinion gear is fundamental to reliable power delivery and precise drivetrain synchronization in high-performance applications. The S&S CYCLE 33-4144 is precision-machined and heat-treated...DS194248- SKU:
- DS194248
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- PINION
- UNITS:
- EACH
- PRODUCT NAME:
- GEAR
- RIDING STYLE:
- STREET
- SIZE IMPERIAL:
- 1.4729' - 1.4737'
MSRP: $112.95Now: $101.66Was: $112.95 -
On Sale
S&S CYCLE Viton O-Ring 50-7961-S
S&S CYCLE
MSRP: $9.95Now: $8.96Was: $9.95A worn or degraded O-ring in your S&S Super E or G carburetor can cause fuel leaks, air leaks, and inconsistent jetting—all of which tank performance and reliability. This OEM Viton O-ring is...09350862- SKU:
- 09350862
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- EACH
- INSIDE DIAMETER:
- 5,250'
- INSIDE DIAMETER IMPERIAL:
- 5.250'
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- OUTSIDE DIAMETER:
- 5,437'
- OUTSIDE DIAMETER IMPERIAL:
- 5.437'
- PRODUCT NAME:
- O-RING
- STYLE:
- PERFORMANCE REPLACEMENT
MSRP: $9.95Now: $8.96Was: $9.95 -
On Sale
S&S CYCLE Viton O-Ring 50-8008
S&S CYCLE
MSRP: $4.95Now: $4.46Was: $4.95Carburetor sealing integrity directly impacts fuel delivery consistency and engine performance. A degraded or missing O-ring in your Super E or G carburetor can introduce air leaks, causing lean...09350863- SKU:
- 09350863
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- OUTSIDE DIAMETER:
- 0,565'
- UNITS:
- EACH
- INSIDE DIAMETER:
- 0,437'
- MATERIAL:
- VITON
- OUTSIDE DIAMETER IMPERIAL:
- 0.565'
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- INSIDE DIAMETER IMPERIAL:
- 0.437'
- PRODUCT NAME:
- O-RING
MSRP: $4.95Now: $4.46Was: $4.95 -
On Sale
S&S CYCLE Silicone O-Ring 50-8012
S&S CYCLE
MSRP: $6.95Now: $6.26Was: $6.95Carburetor sealing integrity is critical to maintaining precise fuel-air ratios and preventing vacuum leaks that compromise performance. This S&S Cycle silicone O-ring is engineered as a direct...09350866- SKU:
- 09350866
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- INSIDE DIAMETER:
- 0,218'
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- OUTSIDE DIAMETER IMPERIAL:
- 0.3438'
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.218'
- PRODUCT NAME:
- O-RING
- APPLICATION:
- ACCELERATOR PUMP CAP
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 0,3438'
MSRP: $6.95Now: $6.26Was: $6.95 -
On Sale
S&S CYCLE Nitrile O-Ring 50-8013
S&S CYCLE
MSRP: $6.95Now: $6.26Was: $6.95If you're running a Super E or G carburetor, seal integrity directly impacts fuel delivery precision and overall engine performance. A worn or degraded o-ring creates fuel leaks, air leaks, and...09350867- SKU:
- 09350867
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- PRODUCT NAME:
- O-RING
- MATERIAL:
- NITRILE RUBBER
- OUTSIDE DIAMETER IMPERIAL:
- 2.187'
- UNITS:
- EACH
- APPLICATION:
- INTAKE MANIFOLD TO CARBURETOR
- INSIDE DIAMETER:
- 2,000'
- INSIDE DIAMETER IMPERIAL:
- 2.000'
- OUTSIDE DIAMETER:
- 2,187'
MSRP: $6.95Now: $6.26Was: $6.95 -
On Sale
S&S CYCLE Nitrile O-Ring 50-8016
S&S CYCLE
MSRP: $6.95Now: $6.26Was: $6.95A deteriorating or missing O-ring in your S&S Super E or G carburetor can cause fuel leaks, air leaks, and erratic idle conditions that compromise both performance and reliability. This OEM nitrile...09350868- SKU:
- 09350868
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- INSIDE DIAMETER:
- 2,000'
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- INSIDE DIAMETER IMPERIAL:
- 2.000'
- MATERIAL:
- NITRILE RUBBER
- OUTSIDE DIAMETER:
- 2,125'
- OUTSIDE DIAMETER IMPERIAL:
- 2.125'
- UNITS:
- EACH
MSRP: $6.95Now: $6.26Was: $6.95 -
On Sale
S&S CYCLE Viton O-Ring 50-8044
S&S CYCLE
MSRP: $6.95Now: $6.26Was: $6.95A worn or degraded O-ring in your Super E or G carburetor will cause fuel leaks, air leaks, and inconsistent jetting—compromising both performance and reliability. This OEM S&S Cycle Viton O-ring is...09350869- SKU:
- 09350869
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- MATERIAL:
- VITON
- OUTSIDE DIAMETER:
- 1,875'
- PRODUCT NAME:
- O-RING
- INSIDE DIAMETER:
- 1,625'
- INSIDE DIAMETER IMPERIAL:
- 1.625'
- OUTSIDE DIAMETER IMPERIAL:
- 1.875'
- UNITS:
- EACH
MSRP: $6.95Now: $6.26Was: $6.95 -
On Sale
S&S CYCLE Silicone O-Ring 50-8095
S&S CYCLE
MSRP: $19.95Now: $17.96Was: $19.95Carburetor seal integrity directly impacts fuel atomization and engine performance—a worn or degraded O-ring compromises both. The S&S Cycle silicone O-ring is engineered for Super E and G...09350870- SKU:
- 09350870
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- INSIDE DIAMETER:
- 0,390'
- OUTSIDE DIAMETER IMPERIAL:
- 0.510'
- UNITS:
- 10 PACK
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 0,510'
- PRODUCT NAME:
- O-RING
- INSIDE DIAMETER IMPERIAL:
- 0.390'
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
MSRP: $19.95Now: $17.96Was: $19.95 -
On Sale
S&S CYCLE Valve Guide Seals - 8 pack 90-2158
S&S CYCLE
MSRP: $23.95Now: $21.56Was: $23.95Valve guide seals are critical to maintaining proper oil control in your engine's cylinder head—worn or damaged seals allow oil to seep past the guides and into the combustion chamber, causing...09351009- SKU:
- 09351009
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- FUEL VALVE
- PRODUCT NAME:
- SEAL
- UNITS:
- 8 PACK
- RIDING STYLE:
- STREET
MSRP: $23.95Now: $21.56Was: $23.95 -
On Sale
S&S CYCLE Viton O-Ring - 14 mm x 1.5 mm 500-0861
S&S CYCLE
MSRP: $14.95Now: $13.46Was: $14.95Carburetor sealing integrity directly impacts fuel delivery precision and engine performance. A worn or degraded o-ring allows fuel and air mixture leakage, compromising combustion efficiency and...09351014- SKU:
- 09351014
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- UNITS:
- 5 PACK
MSRP: $14.95Now: $13.46Was: $14.95Qty in Cart: 0Quantity:Price:MSRP: $14.95Now: $13.46Was: $14.95Subtotal: -
On Sale
S&S CYCLE Top End Kit - Big Twin 90-0098
S&S CYCLE
MSRP: $3,659.95Now: $3,293.96Was: $3,659.95If you're running a Big Twin and want bolt-on power without the machine shop downtime, the S&S Cycle Top End Kit delivers a complete, ready-to-install solution. Pre-fit pistons and...09031270- SKU:
- 09031270
- Availability:
- Ships Same Business Day
- Weight:
- 60.10 LBS
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- BORE SIZE IMPERIAL:
- 3.500'
- COMPRESSION RATIO IMPERIAL:
- 8.0:1
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
- DISPLACEMENT:
- 80'
- RIDING STYLE:
- STREET
- STYLE:
- SHOVELHEAD
MSRP: $3,659.95Now: $3,293.96Was: $3,659.95 -
On Sale
S&S CYCLE Piston Kit - 1250 XL 920-0070
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running a Big Twin and want legitimate displacement gains without a complete engine rebuild, the S&S Cycle 1250cc piston kit delivers a straightforward path to increased cubic inches and...09103554- SKU:
- 09103554
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
MSRP: $484.95Now: $436.46Was: $484.95Qty in Cart: 0Quantity:Price:MSRP: $484.95Now: $436.46Was: $484.95Subtotal: -
On Sale
S&S CYCLE Piston Kit - 1250 XL 920-0071
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running an 883 or early 1200cc Big Twin and want genuine displacement gains without sacrificing reliability, the S&S Cycle 1250cc piston kit delivers a straightforward path to increased...09103555- SKU:
- 09103555
- Availability:
- Ships Same Business Day
- Weight:
- 2.55 LBS
MSRP: $484.95Now: $436.46Was: $484.95Qty in Cart: 0Quantity:Price:MSRP: $484.95Now: $436.46Was: $484.95Subtotal: -
On Sale
S&S CYCLE Piston Kit - Standard 106-3491A
S&S CYCLE
MSRP: $617.95Now: $556.16Was: $617.95Maintaining peak engine performance demands precision-engineered internal components that can withstand extreme combustion pressures and sustained RPM loads. The S&S Cycle Piston Kit delivers...09103657- SKU:
- 09103657
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- DISPLACEMENT:
- 111'
- DISPLACEMENT:
- 124'
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 117'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- FORGED ALUMINUM
MSRP: $617.95Now: $556.16Was: $617.95 -
On Sale
S&S CYCLE Piston Kit - +.010 106-3872A
S&S CYCLE
MSRP: $617.95Now: $556.16Was: $617.95When your engine demands more power and reliability, a quality piston kit is non-negotiable. The S&S Cycle +.010 Piston Kit delivers the precision-engineered internals needed for forced-induction...09103658- SKU:
- 09103658
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- BORE - OVERSIZE:
- +0,010'
- DISPLACEMENT:
- 117'
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- BORE SIZE IMPERIAL:
- 4.125'
- DISPLACEMENT:
- 111'
- DISPLACEMENT:
- 124'
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED ALUMINUM
MSRP: $617.95Now: $556.16Was: $617.95 -
On Sale
S&S CYCLE Piston Kit - +.020 106-3964A
S&S CYCLE
MSRP: $617.95Now: $556.16Was: $617.95When you're rebuilding an engine or pushing your build to higher displacement, quality pistons are non-negotiable. This S&S Cycle piston kit delivers the precision and durability required for...09103659- SKU:
- 09103659
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- PISTON MATERIAL:
- FORGED ALUMINUM
- BORE SIZE IMPERIAL:
- 4.125'
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- DISPLACEMENT:
- 111'
- DISPLACEMENT:
- 124'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,020'
- DISPLACEMENT:
- 117'
MSRP: $617.95Now: $556.16Was: $617.95 -
On Sale
S&S CYCLE High Compression Piston Kit 920-0101
S&S CYCLE
MSRP: $514.95Now: $463.46Was: $514.95If you're serious about extracting maximum performance from your engine, this S&S Cycle High Compression Piston Kit delivers measurable power gains without compromising mid-range torque—a rare...09104524- SKU:
- 09104524
- Availability:
- Ships Same Business Day
- Weight:
- 3.10 LBS
MSRP: $514.95Now: $463.46Was: $514.95 -
On Sale
S&S CYCLE High Compression Piston Kit 920-0100
S&S CYCLE
MSRP: $514.95Now: $463.46Was: $514.95If you're looking to unlock genuine performance gains without sacrificing low-end torque, the S&S Cycle High Compression Piston Kit delivers measurable horsepower increases through engineered...09104526- SKU:
- 09104526
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
MSRP: $514.95Now: $463.46Was: $514.95 -
On Sale
S&S CYCLE Piston Kit 106-3688
S&S CYCLE
MSRP: $514.95Now: $463.46Was: $514.95If you're running a Big Twin and want measurable power gains without a complete engine rebuild, this S&S piston kit delivers a straightforward path to 1250cc displacement. The 10.3:1 compression...09104208- SKU:
- 09104208
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- STROKE LENGTH IMPERIAL:
- 4'
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE SIZE IMPERIAL:
- 3.927'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 97'
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- REPLACEMENT
- UNITS:
- KIT
MSRP: $514.95Now: $463.46Was: $514.95 -
On Sale
S&S CYCLE Piston Kit 106-3690
S&S CYCLE
MSRP: $514.95Now: $463.46Was: $514.95If you're running a stock 883cc or 1200cc Big Twin, you're leaving significant power on the table. The S&S CYCLE Piston Kit 106-3690 bumps displacement to 1250cc while maintaining reliable 10.3:1...09104209- SKU:
- 09104209
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- BORE SIZE IMPERIAL:
- 3.927'
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 106'
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- REPLACEMENT
- UNITS:
- KIT
MSRP: $514.95Now: $463.46Was: $514.95
