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
-
KB PERFORMANCE Piston Kit - XL KB295.010
KB PERFORMANCE
$227.95If you're building a high-revving engine or pushing boost levels beyond stock capability, piston durability and ring seal directly impact power output and engine longevity. KB Performance pistons are...DS751237- SKU:
- DS751237
- Availability:
- Ships Same Business Day
- Weight:
- 2.65 LBS
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- BORE SIZE IMPERIAL:
- 3.498'
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON HEAD SHAPE:
- FLAT TOP
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$227.95 -
KB PERFORMANCE Piston Kit KB297.000
KB PERFORMANCE
$246.95If you're serious about engine longevity and ring seal quality, piston tolerances matter—a lot. KB Performance's diamond-machined pistons are held to plus-or-minus one gram weight and...DS751258- SKU:
- DS751258
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 8.3:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.498'
$246.95 -
KB PERFORMANCE Piston Kit - Twin Cam KB411.000
KB PERFORMANCE
$307.95If you're building a high-revving engine or rebuilding after serious track time, piston quality directly impacts reliability and performance. KB Performance's T-5 heat-treated hypereutectic aluminum...DS751286- SKU:
- DS751286
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$307.95 -
KB PERFORMANCE Lock Ring - Twin Cam PRJ-100
KB PERFORMANCE
$10.95Piston lock rings are critical wear items that secure your piston pin in place under extreme combustion pressures and RPM loads. Over time, these rings fatigue and lose their grip, leading to...09130002- SKU:
- 09130002
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- PISTON
- RIDING STYLE:
- STREET
- TYPE:
- LOCK RING
- UNITS:
- 4 PACK
- PRODUCT NAME:
- WRIST PIN
$10.95 -
KB PERFORMANCE Piston Kit KB348.010
KB PERFORMANCE
$295.95If you're building or rebuilding a high-performance engine, piston quality directly impacts reliability, ring seal, and longevity under boost or high RPM. KB Performance pistons are manufactured to...09102020- SKU:
- 09102020
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- BORE SIZE IMPERIAL:
- 3.875'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 9.3:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
$295.95 -
KB PERFORMANCE Piston Kit - Twin Cam KB409C.005
KB PERFORMANCE
$236.95If you're building or rebuilding a Twin Cam engine, piston quality directly impacts reliability, longevity, and ring seal—three things that separate a weekend warrior from a competitor. KB...09100916- SKU:
- 09100916
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- HYPEREUTECTIC ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- UNITS:
- KIT
$236.95 -
KB PERFORMANCE Forged Piston Kit - Twin Cam KB904C.STD
KB PERFORMANCE
$322.95If you're rebuilding a Twin Cam engine or restoring your top-end assembly, you need pistons engineered for reliability under sustained load. The KB PERFORMANCE Forged Piston Kit delivers forged 4032...09100933- SKU:
- 09100933
- Availability:
- Ships Same Business Day
- Weight:
- 2.20 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- UNITS:
- KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- COMPRESSION RATIO IMPERIAL:
- 9.25:1
$322.95 -
KB PERFORMANCE Piston - Evolution KB920C.005
KB PERFORMANCE
$299.95KB Performance pistons are engineered for reliability and consistent power delivery in high-rpm applications. The 4032 aluminum alloy forging provides the strength needed for forced induction and...09105055- SKU:
- 09105055
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.5:1
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +0,005'
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE IMPERIAL:
- 3.498'
$299.95 -
KB PERFORMANCE Forged Piston Kit - Twin Cam KB661C.005
KB PERFORMANCE
$322.95When you're pushing your Twin Cam engine to its limits, stock pistons become a liability. The KB PERFORMANCE Forged Piston Kit delivers the strength and precision needed for sustained high-RPM...09103974- SKU:
- 09103974
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 4.005'
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,005'
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$322.95Qty in Cart: 0Quantity:Price:$322.95Subtotal: -
KB PERFORMANCE Forged Piston Kit - Twin Cam KB907C.STD
KB PERFORMANCE
$322.95If you're rebuilding a Twin Cam engine or pushing it beyond stock limits, piston quality directly impacts reliability and performance. KB Performance's forged 4032 aluminum construction resists...09100937- SKU:
- 09100937
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.5:1
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.875'
$322.95 -
GARDNER-WESTCOTT 3/8" - NPT Plug 7-107CSP-6
GARDNER-WESTCOTT
$7.95A quality NPT plug is essential for sealing off unused ports on your fuel system, cooling lines, or pneumatic components—preventing leaks, contamination, and system failures. Gardner-Westcott's...DS245261- SKU:
- DS245261
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- CONNECTION TYPE:
- 3/8' NPT (MALE)
- CONNECTOR ANGLE:
- STRAIGHT
- PRODUCT NAME:
- FITTING
- TYPE:
- PLUG
- UNITS:
- EACH
$7.95Qty in Cart: 0Quantity:Price:$7.95Subtotal: -
GARDNER-WESTCOTT Breather Fitting - 1/4" NPT x 3/8" Hose 7-90TD-6X4
GARDNER-WESTCOTT
$7.95Proper crankcase ventilation is essential for engine longevity and reliability, especially in high-performance applications where pressure buildup can compromise seals and gaskets. The...DS245263- SKU:
- DS245263
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- FITTING
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- TYPE:
- BREATHER
- BASE FINISH:
- CHROME
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- POLISHED
- CONNECTION TYPE:
- 1/4' NPT (MALE)
- CONNECTION TYPE:
- 3/8' HOSE FITTING
- CONNECTOR ANGLE:
- STRAIGHT
$7.95 -
On Sale
ANDREWS Camshaft - C Grind - Big Twin 212600
ANDREWS
MSRP: $251.95Now: $226.76Was: $251.95If you're running a big twin street engine or planning a stroker build between 84 and 96 cubic inches, the ANDREWS C Grind Camshaft delivers the broad torque band you need for real-world driving...09250583- SKU:
- 09250583
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- EXHAUST LIFT AT TDC IMPERIAL:
- SHOVEL: 0.206' PAN: 0.217'
- GRIND:
- C
- EXHAUST LIFT IMPERIAL:
- SHOVEL: 0.525' PAN: 0.550'
- INTAKE LIFT IMPERIAL:
- SHOVEL: 0.525' PAN: 0.550'
- APPLICATION:
- INTAKE
- INTAKE LIFT AT TDC IMPERIAL:
- SHOVEL: 0.206' PAN: 0.217'
- PRODUCT NAME:
- CAM
- RIDING STYLE:
- STREET
- TYPE:
- GEAR
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
MSRP: $251.95Now: $226.76Was: $251.95Qty in Cart: 0Quantity:Price:MSRP: $251.95Now: $226.76Was: $251.95Subtotal: -
DRAG SPECIALTIES Oil Line Kit - Stainless Steel - Dyna 606100
DRAG SPECIALTIES
$129.27OEM oil lines deteriorate over time, compromising system integrity and risking catastrophic engine damage. This stainless steel replacement kit restores reliable oil delivery with factory-correct...07110042- SKU:
- 07110042
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- LINE
- FEATURES:
- 3-LINE KIT
- STYLE:
- BRAIDED
- UNITS:
- KIT
- BASE COLOR:
- SILVER
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- MATERIAL:
- STAINLESS STEEL
$129.27Qty in Cart: 0Quantity:Price:$129.27Subtotal: -
FEULING OIL PUMP CORP. Camshaft Installation Kit - Gear Drive 2066
FEULING OIL PUMP CORP.
$139.95A quality camshaft installation requires precision fasteners, proper bearing support, and the right gasket seals to ensure reliability under high RPM conditions. The Feuling Oil Pump Corp. Camshaft...09250536- SKU:
- 09250536
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PRODUCT NAME:
- INSTALLATION KIT
- MODEL:
- PLUS
- TYPE:
- CAMSHAFT
- TYPE:
- GEAR
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$139.95Qty in Cart: 0Quantity:Price:$139.95Subtotal: -
On Sale
GOODRIDGE Universal Oil Line - 10" VTOL-010
GOODRIDGE
MSRP: $38.95Now: $35.06Was: $38.95Oil line integrity is critical in high-performance applications where system pressure and thermal cycling demand absolute reliability. This GOODRIDGE universal oil line delivers superior pressure...07110137- SKU:
- 07110137
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BASE COLOR:
- SILVER
- LENGTH IMPERIAL:
- 10'
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- STYLE:
- BRAIDED
- LENGTH METRIC:
- 25.5 CM
- PRODUCT NAME:
- LINE
- COLOR/FINISH:
- CHROME
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- EACH
MSRP: $38.95Now: $35.06Was: $38.95Qty in Cart: 0Quantity:Price:MSRP: $38.95Now: $35.06Was: $38.95Subtotal: -
On Sale
GOODRIDGE Straight Oil Line Fitting - Black -1/8" NPT AN816-06-02DBK
GOODRIDGE
MSRP: $5.95Now: $5.36Was: $5.95A reliable oil line system is critical to engine longevity and consistent performance—any leak or fitting failure can compromise lubrication and lead to catastrophic damage. The GOODRIDGE Straight...07110205- SKU:
- 07110205
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- FITTING ANGLE:
- STRAIGHT
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- FITTING
- TYPE:
- OIL LINE
- UNITS:
- EACH
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- FITTING CONNECTOR TYPE:
- 1/8' NPT MALE
- BASE COLOR:
- BLACK
- FITTING CONNECTOR TYPE:
- -6 AN MALE
- RIDING STYLE:
- STREET
MSRP: $5.95Now: $5.36Was: $5.95 -
JAGG OIL COOLERS Replacement Gasket Kit GK4600
JAGG OIL COOLERS
$10.95Oil leaks at the filter adapter are a common failure point in high-performance cooling systems, and worn gaskets are the culprit. This genuine JAGG replacement gasket kit restores a leak-free seal...4600GK- SKU:
- 4600GK
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- OIL COOLER ADAPTER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
JAGG OIL COOLERS Oil Line Upgrade Kit - Black - 3' 211-JLWN06
JAGG OIL COOLERS
$69.95If you're running a JAGG oil cooler, your hose routing deserves the same attention to detail as your engine build. This upgrade kit replaces factory hoses with braided performance lines and precision...07110231- SKU:
- 07110231
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- HOSE
- STYLE:
- BRAIDED
- LENGTH IMPERIAL:
- 3'
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- KIT
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
$69.95 -
JAGG OIL COOLERS Oil Line Upgrade Kit - Stainless Steel - 3' 211-JSSN06
JAGG OIL COOLERS
$69.95If you're running a JAGG oil cooler, your hose routing deserves the same attention to detail as your engine bay. This stainless steel upgrade kit replaces factory rubber lines with track-proven...07110232- SKU:
- 07110232
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- MATERIAL:
- ALUMINUM
- TYPE:
- OIL
- COLOR/FINISH:
- STAINLESS STEEL
- LENGTH IMPERIAL:
- 3'
- RIDING STYLE:
- STREET
- BASE FINISH:
- NATURAL
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- HOSE
- STYLE:
- BRAIDED
$69.95Qty in Cart: 0Quantity:Price:$69.95Subtotal:
