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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REVOLUTION PERFORMANCE, LLC Piston Kit RP301-105W
REVOLUTION PERFORMANCE, LLC
$495.95High-performance pistons demand precision engineering and material science to withstand extreme combustion pressures and thermal cycling. The REVOLUTION PERFORMANCE RP301-105W piston kit delivers...09106371- SKU:
- 09106371
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- BORE SIZE IMPERIAL:
- 3.937'
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- PISTON HEAD SHAPE:
- FLAT TOP
- STROKE LENGTH IMPERIAL:
- 4'
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 98'
- UNITS:
- KIT
$495.95 -
On Sale
EMGO Crankcase Filter Kit 14-20910
EMGO
MSRP: $9.54Now: $9.06Was: $9.54High-quality crankcase breathers and filters from Emgo1420910- SKU:
- 1420910
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- FEATURES:
- RUBBER-TOP
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
- PRODUCT NAME:
- VENT FILTER
MSRP: $9.54Now: $9.06Was: $9.54 -
On Sale
EMGO Replacement Filter - Chrome 14-20905
EMGO
MSRP: $10.77Now: $10.23Was: $10.77For use only with crankcase vent filter1420905- SKU:
- 1420905
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- FILTER
- UNITS:
- EACH
MSRP: $10.77Now: $10.23Was: $10.77 -
On Sale
EMGO Crankcase Filter Kit 14-20900
EMGO
MSRP: $21.54Now: $20.46Was: $21.54High-quality crankcase breathers and filters from Emgo1420900- SKU:
- 1420900
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
- FEATURES:
- WITH CHROME BASE
- PRODUCT NAME:
- VENT FILTER
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
MSRP: $21.54Now: $20.46Was: $21.54 -
On Sale
EMGO Oil Filter - Chrome 10-82442
EMGO
MSRP: $13.54Now: $12.86Was: $13.54A quality oil filter is fundamental to engine longevity—it removes contaminants that would otherwise accelerate wear on critical internal components. The EMGO Chrome 10-82442 uses premium materials...1082440- SKU:
- 1082440
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- BASE COLOR:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- UNITS:
- EACH
MSRP: $13.54Now: $12.86Was: $13.54 -
On Sale
EMGO Oil Filter - Chrome 10-82400
EMGO
MSRP: $9.23Now: $8.77Was: $9.23A quality oil filter is foundational to engine longevity—it removes contaminants that accelerate wear on critical internal components. The EMGO Chrome 10-82400 uses premium paper, metal, and rubber...1082400- SKU:
- 1082400
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- CHROME
- BASE COLOR:
- SILVER
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
MSRP: $9.23Now: $8.77Was: $9.23 -
On Sale
EMGO Drop-In Oil Filter with Seals 10-28300
EMGO
MSRP: $5.08Now: $4.83Was: $5.08An oil filter is one of the most cost-effective maintenance items you can invest in—and it directly impacts engine longevity and performance. The EMGO Drop-In Oil Filter (10-28300) uses premium-grade...1028300- SKU:
- 1028300
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- SILVER
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
- TYPE:
- DROP-IN
- RIDING STYLE:
- STREET
MSRP: $5.08Now: $4.83Was: $5.08 -
On Sale
EMGO Oil Filter - Chrome 10-07800
EMGO
MSRP: $9.23Now: $8.77Was: $9.23An engine's lifespan depends entirely on oil quality, and that starts with filtration. The EMGO Oil Filter 10-07800 uses multi-layer paper media and reinforced epoxy-bonded construction to trap...1007800- SKU:
- 1007800
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- BASE COLOR:
- SILVER
- PRODUCT NAME:
- OIL FILTER
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- CHROME
MSRP: $9.23Now: $8.77Was: $9.23 -
On Sale
EMGO Oil Filter - Black 10-07700
EMGO
MSRP: $6.77Now: $6.43Was: $6.77A quality oil filter is fundamental to engine longevity—it directly impacts how well your engine stays protected from contaminants that accelerate wear. The EMGO 10-07700 uses premium filtration...1007700- SKU:
- 1007700
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- BASE COLOR:
- BLACK
- FILTER MEDIA MATERIAL:
- PAPER
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- TYPE:
- SPIN-ON
MSRP: $6.77Now: $6.43Was: $6.77 -
On Sale
EMGO Oil filter 10-28310
EMGO
MSRP: $5.54Now: $5.26Was: $5.54An engine is only as clean as its oil filter. The EMGO 10-28310 uses premium filtration media and robust construction to keep contaminants out of your oil system, directly extending engine life and...07120409- SKU:
- 07120409
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- COLOR/FINISH:
- SILVER
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- TYPE:
- DROP-IN
- COLOR/FINISH:
- ORANGE
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- RIDING STYLE:
- STREET
MSRP: $5.54Now: $5.26Was: $5.54 -
On Sale
COMETIC Head Gasket - 4"- .040" C9880
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket failure can sideline your engine and drain your wallet—this is where precision engineering becomes non-negotiable. The COMETIC C9880 uses Multi-Layer Steel (MLS) construction with Load...09340010- SKU:
- 09340010
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Head Gasket - SSW - +4.125" - .027" C9930
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket is your engine's first line of defense against combustion blow-by and coolant leakage—and compromising on quality here invites catastrophic failure. The COMETIC SSW Head Gasket is...09340031- SKU:
- 09340031
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.69 MM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,69 MM (0,027')
- THICKNESS IMPERIAL:
- 0,027'
- UNITS:
- PAIR
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Head Gasket SSW+4.125.030 C9931
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket failure can cost you race time and credibility on the track. The COMETIC SSW+4.125.030 delivers the seal integrity and thermal stability you need to keep combustion pressure where it...09340032- SKU:
- 09340032
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Head Gasket - SSW - +4.125" - .036" C9932
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket is the critical seal between your engine block and cylinder head—any compromise in material quality directly impacts combustion efficiency, coolant integrity, and overall engine...09340033- SKU:
- 09340033
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,91 MM (0,036')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Head Gasket - SSW - +4.125" - .040" C9933
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket failure can end your race day or sideline your project build indefinitely. The COMETIC SSW Head Gasket delivers the sealing reliability required for high-boost and high-rpm...09340034- SKU:
- 09340034
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,125'
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Base Gasket - +4.125" - .020" C9936
COMETIC
MSRP: $33.55Now: $30.20Was: $33.55A precision base gasket is critical to maintaining boost pressure integrity and preventing coolant/oil seepage in high-performance applications. The COMETIC C9936 combines a stainless steel core with...09340036- SKU:
- 09340036
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
MSRP: $33.55Now: $30.20Was: $33.55 -
On Sale
COMETIC Oil Pan Gasket - M8 C10243
COMETIC
MSRP: $22.00Now: $19.80Was: $22.00A leaking oil pan gasket compromises engine lubrication and creates mess under your bay—neither acceptable for serious racers or meticulous builders. The COMETIC M8 C10243 delivers a complete gasket...09346335- SKU:
- 09346335
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PAN
MSRP: $22.00Now: $19.80Was: $22.00 -
On Sale
COMETIC Trans Top Cover Gasket - M8 C10246
COMETIC
MSRP: $25.15Now: $22.64Was: $25.15A leaking transmission top cover gasket compromises hydraulic integrity and invites contamination into your gearbox—exactly what you don't need mid-race or mid-project. The COMETIC Trans Top Cover...09346336- SKU:
- 09346336
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
MSRP: $25.15Now: $22.64Was: $25.15 -
On Sale
COMETIC Breather Gasket Kit - Twin Cam C10161
COMETIC
MSRP: $20.95Now: $18.86Was: $20.95A breather system that weeps oil or allows blow-by gases to escape is a sign of worn gaskets and seals—problems that compound quickly under boost or high RPM operation. The COMETIC Breather Gasket...09346002- SKU:
- 09346002
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- BREATHER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $20.95Now: $18.86Was: $20.95Qty in Cart: 0Quantity:Price:MSRP: $20.95Now: $18.86Was: $20.95Subtotal: -
On Sale
COMETIC Primary Gasket C10211
COMETIC
MSRP: $33.55Now: $30.20Was: $33.55A primary gasket kit is the foundation of a reliable engine seal—critical for preventing oil leaks, maintaining proper combustion pressure, and avoiding costly internal damage. The Cometic C10211...09345980- SKU:
- 09345980
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- EACH
MSRP: $33.55Now: $30.20Was: $33.55Qty in Cart: 0Quantity:Price:MSRP: $33.55Now: $30.20Was: $33.55Subtotal:
