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
EASTERN MOTORCYCLE PARTS Left Side Crankcase Bushing A-24621-40
EASTERN MOTORCYCLE PARTS
MSRP: $114.95Now: $104.60Was: $114.95Crankcase bushings are critical wear items that directly impact engine longevity and reliability. A degraded bushing compromises crankshaft alignment, leading to increased friction, vibration, and accelerated bearing wear. The EASTERN MOTORCYCLE PARTS...DS194098- SKU:
- DS194098
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
MSRP: $114.95Now: $104.60Was: $114.95 -
On Sale
EASTERN MOTORCYCLE PARTS Check Valve Spring - Big Twin A-26262-80
EASTERN MOTORCYCLE PARTS
Now: $6.10Was: $6.70A worn or compromised check valve spring can lead to inconsistent oil pressure, inadequate lubrication, and accelerated engine wear—especially critical in high-demand Big Twin applications. This OEM-spec replacement restores proper spring relief valve...DS194222- SKU:
- DS194222
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- CHECK VALVE
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SPRING
Now: $6.10Was: $6.70 -
On Sale
EASTERN MOTORCYCLE PARTS Oil Pump Bushing/Gasket Kit 17-0126
EASTERN MOTORCYCLE PARTS
MSRP: $16.95Now: $15.42Was: $16.95Oil pump failure isn't just an inconvenience—it's catastrophic for engine longevity. This comprehensive bushing and gasket kit lets you restore your oil pump to factory specifications without replacing the entire assembly, saving time and expense while...DS194201- SKU:
- DS194201
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- OIL PUMP
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $16.95Now: $15.42Was: $16.95 -
On Sale
EASTERN MOTORCYCLE PARTS Oil Pump Kit - Big Twin 17-0157
EASTERN MOTORCYCLE PARTS
MSRP: $49.95Now: $45.45Was: $49.95A properly functioning oil pump is non-negotiable for Big Twin engine longevity and reliability. This Eastern Motorcycle Parts kit delivers consistent oil pressure and flow to critical engine components, protecting your investment through extended riding...DS194205- SKU:
- DS194205
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHAFT
- TYPE:
- OIL PUMP
- UNITS:
- KIT
MSRP: $49.95Now: $45.45Was: $49.95 -
On Sale
EASTERN MOTORCYCLE PARTS Bearing Retaining Washer - 0.070" - Big Twin A-35131-81
EASTERN MOTORCYCLE PARTS
Now: $19.66Was: $21.60Bearing retaining washers are critical wear items in 4-speed Big Twin transmissions—they maintain precise bearing preload and prevent costly internal damage from excessive play. If you're experiencing transmission noise, notchy shifting, or rebuilding...DS194181- SKU:
- DS194181
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- STYLE:
- 4-SPEED
- THICKNESS:
- 1,78 MM (0,070')
- THICKNESS IMPERIAL:
- 0.070'
- THICKNESS METRIC:
- 1.78 MM
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- UNITS:
- 5 PACK
- TYPE:
- BEARING RETAINING
Now: $19.66Was: $21.60 -
On Sale
EASTERN MOTORCYCLE PARTS Main Shaft Thrust Washer - XL A-35326-SET
EASTERN MOTORCYCLE PARTS
MSRP: $56.95Now: $51.82Was: $56.95Main shaft thrust washers are critical for controlling axial play and preventing catastrophic bearing wear in high-performance motorcycle engines. Worn or missing thrust washers allow excessive crankshaft movement, compromising engine timing, increasing...DS194183- SKU:
- DS194183
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- STYLE:
- 4-SPEED
- UNITS:
- SET OF 15
- PRODUCT NAME:
- THRUST WASHER
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- MOUNTING POSITION:
- RIGHT SIDE
- THICKNESS:
- 0,76 MM - 3,18 MM (0,030' - 0,125')
- THICKNESS IMPERIAL:
- 0,030' - 0,125'
- THICKNESS METRIC:
- 0.76 MM - 3.18 MM
MSRP: $56.95Now: $51.82Was: $56.95 -
On Sale
EASTERN MOTORCYCLE PARTS Countershaft Thrust Washer - XL A-35840-SET
EASTERN MOTORCYCLE PARTS
MSRP: $22.95Now: $20.88Was: $22.95First-gear thrust washers experience constant pressure during acceleration and shifting, making them a critical wear item that directly affects powertrain longevity and smooth engagement. Original equipment geometry ensures proper clearances and load...DS194187- SKU:
- DS194187
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,65 MM - 2,54 MM (0,065' - 0,100')
- MOUNTING POSITION:
- FIRST GEAR
- PRODUCT NAME:
- THRUST WASHER
- THICKNESS IMPERIAL:
- 0,065' - 0,100'
- UNITS:
- SET
- STYLE:
- 4-SPEED
- THICKNESS METRIC:
- 1.65 MM - 2.54 MM
- TYPE:
- COUNTERSHAFT
MSRP: $22.95Now: $20.88Was: $22.95 -
On Sale
EASTERN MOTORCYCLE PARTS Countershaft Thrust Washer - XL A-35848-SET
EASTERN MOTORCYCLE PARTS
MSRP: $14.95Now: $13.60Was: $14.95First gear thrust washers are critical wear items that directly impact your countershaft longevity and shifting precision. Over time, these washers compress and degrade, leading to excessive play, noise, and potential gear damage. This OEM-specification...DS194188- SKU:
- DS194188
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- THRUST WASHER
- UNITS:
- SET
- MOUNTING POSITION:
- FIRST GEAR
- STYLE:
- 4-SPEED
- THICKNESS METRIC:
- 1.19 MM - 2.03 MM
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,19 MM - 2,03 MM (0,047' - 0,080')
- THICKNESS IMPERIAL:
- 0,047' - 0,080'
MSRP: $14.95Now: $13.60Was: $14.95 -
On Sale
EASTERN MOTORCYCLE PARTS 4-Speed Gear Spacers - XL A-35865-SET
EASTERN MOTORCYCLE PARTS
Now: $12.74Was: $14.00Precise gear spacing is critical for optimal clutch engagement and transmission reliability in 2-stroke ATVs. These Eastern Motorcycle Parts spacers maintain exact factory tolerances, preventing gear rattle and premature wear that compromises shift...DS194189- SKU:
- DS194189
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 6 PACK
- TYPE:
- 1ST GEAR
- PRODUCT NAME:
- SPACER
Now: $12.74Was: $14.00 -
On Sale
EASTERN MOTORCYCLE PARTS Breather Washer Set A-25313-SET
EASTERN MOTORCYCLE PARTS
MSRP: $16.95Now: $15.42Was: $16.95Precision breather valve tuning demands exact clearance specifications, and this four-piece washer set gives you the incremental sizing needed to dial in your system perfectly. Whether you're fine-tuning crankcase pressure or optimizing ventilation flow,...09500364- SKU:
- 09500364
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- WASHER KIT
- TYPE:
- BREATHER VALVE
- UNITS:
- KIT
MSRP: $16.95Now: $15.42Was: $16.95 -
Wiseco Circlip for Harley-Davidson 1984-1998 FLHTC Electra Glide Classic W5731
WISECO
$2.99Wiseco's W5731 circlip for Harley-Davidson Electra Glide Classic models maintains critical piston ring clearances and prevents unwanted movement within the groove, directly supporting engine reliability during high-RPM operation. Precision-engineered to...W5731- SKU:
- W5731
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- CIRCLIP
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
$2.99 -
Wiseco 1200cc Forged Piston Kit for Harley-Davidson 883 Sportster 1986-2025 K1682
WISECO
$409.95A 883-to-1200cc conversion demands precision engineering and robust internals—the Wiseco K1682 piston kit delivers both. Whether you're building a reliable overbore or executing a full engine refresh, this forged aluminum assembly provides the strength...K1682- SKU:
- K1682
- Availability:
- Ships Same Business Day
- Weight:
- 2.31 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 1200 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- BORE SIZE IMPERIAL:
- 3.498'
- TYPE:
- TOP END
- UNITS:
- EACH
$409.95Qty in Cart: 0Quantity:Price:$409.95Subtotal: -
Wiseco Piston Kit 1986-2003 Harley-Davidson Sportster 883 XLH K1684
WISECO
$409.95A top-end rebuild is one of the most cost-effective ways to restore lost compression, improve ring seal, and extend your Sportster's engine life. The Wiseco K1684 piston kit gives you everything needed for a complete overbore or refresh—forged pistons,...K1684- SKU:
- K1684
- Availability:
- Ships Same Business Day
- Weight:
- 2.31 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- BORE - OVERSIZE:
- +0,020'
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 1200 CC
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- BORE SIZE IMPERIAL:
- 3.518'
- TYPE:
- TOP END
- UNITS:
- EACH
$409.95 -
Wiseco 3.498in 10:1 Piston Kit for 1996-1998 Buell S1 Lightning K1700
WISECO
$409.95If you're rebuilding the top end of your S1 Lightning K1700 or pushing toward an overbore, this Wiseco piston kit delivers the strength and precision needed to handle increased combustion pressures without compromise. Forged from high-silicon aluminum...K1700- SKU:
- K1700
- Availability:
- Ships Same Business Day
- Weight:
- 2.44 LBS
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 1200 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- UNITS:
- EACH
- BORE SIZE IMPERIAL:
- 3.498'
- PISTON MATERIAL:
- ALUMINUM
- TYPE:
- TOP END
$409.95 -
Wiseco Piston Kit 1984-1998 Harley-Davidson FLHR Road King 3.518" Bore K1716
WISECO
$447.95When you're rebuilding or overboring your Harley-Davidson Evolution engine, piston quality directly impacts durability, compression, and power delivery. Wiseco's high-silicon aluminum alloy construction delivers the strength needed for aggressive riding...K1716- SKU:
- K1716
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE - OVERSIZE:
- +0,020'
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- DISPLACEMENT:
- 1353 CC
- PISTON MATERIAL:
- ALUMINUM
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- BORE SIZE IMPERIAL:
- 3.518'
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PISTON MATERIAL:
- FORGED
$447.95 -
Wiseco Piston Kit 3.508in 8.5:1 Compression 1994-1998 Harley-Davidson FLHR FLHRCI FLHRI K1641
WISECO
$422.95The Wiseco K1641 Piston Kit delivers the reliability and precision your Evolution Big Twin demands, whether you're rebuilding a tired top-end or overboring for increased displacement. High-silicon aluminum construction provides the thermal stability and...K1641- SKU:
- K1641
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 8.5:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 1345 CC
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,010'
- BORE SIZE IMPERIAL:
- 3.508'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- TYPE:
- TOP END
- UNITS:
- EACH
$422.95 -
Wiseco Piston Kit 3.518in Bore 8.5:1 Compression 1994-1998 Harley-Davidson Road King FLHR K1642
WISECO
$422.95If you're rebuilding or overboring your Evolution Big Twin, piston quality directly impacts cylinder sealing, combustion efficiency, and engine longevity. The Wiseco K1642 delivers the precision and durability you need for a reliable performance rebuild,...K1642- SKU:
- K1642
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- COMPRESSION RATIO IMPERIAL:
- 8.5:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE IMPERIAL:
- 3.518'
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 1353 CC
- BORE - OVERSIZE:
- +0,020'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- TYPE:
- TOP END
- UNITS:
- EACH
$422.95 -
Wiseco Ring Set 3527X for Harley Davidson FLH Electra Glide 1978-1984
WISECO
$52.95Piston ring wear is one of the leading causes of compression loss and oil consumption in vintage big-twin Harleys. The Wiseco Ring Set 3527X restores proper ring-to-bore sealing on your FLH Electra Glide, recovering lost horsepower and eliminating blowby...3527X- SKU:
- 3527X
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- PRODUCT NAME:
- PISTON RING
- MODEL:
- X SERIES
- RING MATERIAL:
- STEEL
- UNITS:
- SET
- BORE - OVERSIZE:
- +0,030'
- RIDING STYLE:
- STREET
- PISTON DIAMETER IMPERIAL:
- 3.528'
$52.95 -
Wiseco Ring Set 3.538in 1984-1999 Harley-Davidson FLH FLHT FLST FXST 3537X
WISECO
$52.95Worn piston rings kill compression and bleed horsepower—the Wiseco 3537X restores both with precision-engineered sealing that reduces blow-by and friction. Built from high-strength materials and validated through rigorous testing, this ring set delivers...3537X- SKU:
- 3537X
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE - OVERSIZE:
- +0,040'
- MODEL:
- X SERIES
- PISTON DIAMETER IMPERIAL:
- 3.538'
- RING MATERIAL:
- STEEL
- UNITS:
- SET
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.040'
- PRODUCT NAME:
- PISTON RING
$52.95 -
Wiseco Ring Set 3.498in. for Harley-Davidson FLH Electra Glide 1970-1985 3497X
WISECO
$52.95Worn or damaged piston rings rob your FLH of compression, power, and fuel efficiency—exact problems that Wiseco's 3497X ring set eliminates through precision engineering and proven materials. This purpose-built ring set restores proper cylinder sealing...3497X- SKU:
- 3497X
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE IMPERIAL:
- 3.498'
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- STREET
- RING MATERIAL:
- STEEL
- UNITS:
- SET
- BORE - OVERSIZE:
- +0,060'
- BORE OVERSIZE - IMPERIAL:
- +0.060'
- MODEL:
- X SERIES
- PISTON DIAMETER IMPERIAL:
- 3.498'
$52.95
