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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JAMES GASKET Trans Seal Kit - Big Twin 37741-82-K
JAMES GASKET
$24.95Designed for most 4-, 5- or 6-speed Big Twin transmissions, Made in the U.S.A.DS174908- SKU:
- DS174908
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- STYLE:
- 4-SPEED
- UNITS:
- KIT
- APPLICATION:
- TRANSMISSION
- STYLE:
- DOUBLE LIP
$24.95 -
JAMES GASKET Trans Seal Kit - Big Twin 12050-K
JAMES GASKET
$26.95Designed for most 4-, 5- or 6-speed Big Twin transmissions, Made in the U.S.A.DS174907- SKU:
- DS174907
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- STYLE:
- 4-SPEED
- UNITS:
- KIT
- APPLICATION:
- TRANSMISSION
- STYLE:
- 5-SPEED
$26.95 -
JAMES GASKET Trans Seal Kit - Big Twin 12067-AK
JAMES GASKET
$26.95Designed for most 4-, 5- or 6-speed Big Twin transmissions, Made in the U.S.A.DS174906- SKU:
- DS174906
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- STYLE:
- 5-SPEED
- STYLE:
- 4-SPEED
$26.95 -
JAMES GASKET Big Bore Kit - Big Twin 16770-84S
JAMES GASKET
$52.95Genuine James kits include matching head and base gaskets and O-rings where applicable, Made in the U.S.A.DS174903- SKU:
- DS174903
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- STYLE:
- BIG BORE
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- TEFLON
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
$52.95 -
JAMES GASKET Rocker Box Rubber Gasket - XL 17030-89
JAMES GASKET
$68.95Made in the U.S.A.DS174902- SKU:
- DS174902
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
$68.95 -
JAMES GASKET Teflon Head Gasket - XL 16769-57
JAMES GASKET
$43.20Made in the U.S.A.DS174900- SKU:
- DS174900
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- TEFLON
- THICKNESS:
- 1,14 MM (0,045')
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.14 MM
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
$43.20 -
JAMES GASKET Countershaft Cap Gasket 36025-36
JAMES GASKET
$11.30Replacement counter shaft cap gasket. Made in the U.S.A.DS174899- SKU:
- DS174899
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- STYLE:
- COVER
- TYPE:
- COUNTERSHAFT
- TYPE:
- TRANSMISSION
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
$11.30 -
JAMES GASKET Trans Dust Cover Gasket 34565-52
JAMES GASKET
$9.50Flexible paper gasket product line utilized the latest in gasket paper technology called MicroPore., These gaskets exhibit exceptional fluid resistance and sealability in a wide range of applications and flange conditions., Made in the U.S.A.DS174897- SKU:
- DS174897
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- TYPE:
- SHIFTER ADAPTER PLATE
$9.50 -
JAMES GASKET Kicker Cover Gasket - 4 Speed 33295-36
JAMES GASKET
$10.60Flexible paper gasket product line utilized the latest in gasket paper technology called MicroPore., These gaskets exhibit exceptional fluid resistance and sealability in a wide range of applications and flange conditions., With a reduced pore size, this...DS174895- SKU:
- DS174895
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- STYLE:
- 4-SPEED
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION END COVER
$10.60 -
JAMES GASKET New Switch Gasket - Big Twin 33043-80
JAMES GASKET
$5.00Quality washers made to last, Made in the U.S.A.DS174894- SKU:
- DS174894
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- 10 PACK
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- NETURAL SWITCH
$5.00 -
JAMES GASKET Speedo Drive Gasket - Big Twin 67141-36
JAMES GASKET
$7.70OEM replacement speedometer drive gear seal.DS174893- SKU:
- DS174893
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- SPEEDOMETER DRIVE
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$7.70 -
JAMES GASKET Trans Top Cover Gasket - Big Twin 34824-36
JAMES GASKET
$15.60Made in the U.S.A.DS174890- SKU:
- DS174890
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- TYPE:
- TRANSMISSION TOP COVER
$15.60 -
JAMES GASKET Trans Top Cover Gasket - FXD 34917-90
JAMES GASKET
$25.50Made in the U.S.A.DS174878- SKU:
- DS174878
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION TOP COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$25.50 -
JAMES GASKET Upper Pushrod Quad Seal 11118
JAMES GASKET
$12.40Made in the U.S.A.DS174832- SKU:
- DS174832
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
- PRODUCT NAME:
- X-RING
- APPLICATION:
- PUSHROD COVER
- TYPE:
- QUAD SEAL
$12.40 -
JAMES GASKET Trans Top Cover Gasket - Big Twin 34824-79
JAMES GASKET
$10.60Made in the U.S.A.DS174831- SKU:
- DS174831
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- STYLE:
- 4-SPEED
- TYPE:
- TRANSMISSION TOP COVER
$10.60 -
JAMES GASKET Mid Pushrod O-Ring 11132
JAMES GASKET
$3.30Made in the U.S.A.DS174830- SKU:
- DS174830
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- APPLICATION:
- PUSHROD COVER
- MATERIAL:
- RUBBER
$3.30 -
JAMES GASKET Oil Pump Cover Gasket - Big Twin 26276-80-A
JAMES GASKET
$14.70JAMES GASKET Oil Pump Cover Gasket - Big TwinDS174829- SKU:
- DS174829
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- STYLE:
- COVER
$14.70 -
JAMES GASKET Pushrod Lower O-Ring 11133
JAMES GASKET
$7.70Made in the U.S.A.DS174828- SKU:
- DS174828
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- TAPPET GUIDE
- UNITS:
- 25 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- PUSHROD COVER
$7.70 -
JAMES GASKET Shift Cover Gasket - Big Twin 33196-79
JAMES GASKET
$7.90Made in the U.S.A.DS174827- SKU:
- DS174827
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- TYPE:
- SHIFTER COVER
- UNITS:
- 10 PACK
$7.90 -
JAMES GASKET Oil Pump Gasket - Big Twin 26273-80-B
JAMES GASKET
$14.70JAMES GASKET Oil Pump Gasket - Big TwinDS174826- SKU:
- DS174826
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- STYLE:
- BODY
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
$14.70
