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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On Sale
S&S CYCLE Cylinder Head Kit - Big Twin 90-1498
S&S CYCLE
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95S&S Cycle's cylinder head kit delivers the flow characteristics and durability demanded by serious Big Twin builders. Whether you're increasing displacement, optimizing combustion chamber design, or restoring a complete top end, these fully assembled...09300009- SKU:
- 09300009
- Availability:
- Ships Same Business Day
- Weight:
- 25.35 LBS
- COLOR/FINISH:
- ALUMINUM
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.500'
- FEATURES:
- SINGLE SPARK PLUG
- PRODUCT NAME:
- CYLINDER HEAD KIT
- STYLE:
- STOCK COMPRESSION
- UNITS:
- KIT
MSRP: $1,723.95Now: $1,551.56Was: $1,723.95Qty in Cart: 0Quantity:Price:MSRP: $1,723.95Now: $1,551.56Was: $1,723.95Subtotal: -
TP ENGINEERING Pro Series Rocker Arms 45-0245-23
TP ENGINEERING
$732.95Rocker arm wear directly impacts valve timing precision and overall engine efficiency—especially in high-RPM applications where even minimal slop compounds into power loss. TP Engineering's Pro Series rocker arms eliminate deflection through rigid 4140...TP24520- SKU:
- TP24520
- Availability:
- Ships Same Business Day
- Weight:
- 3.20 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ROLLER
- UNITS:
- 4 PACK
- MATERIAL:
- STEEL
- MODEL:
- PRO SERIES
- PRODUCT NAME:
- ROCKER ARM
$732.95 -
DRAG SPECIALTIES ROCKER BOX SHOVEL POL 89736
DRAG SPECIALTIES
$762.15A quality rocker box is essential for maintaining proper valve train geometry and oil distribution in your Shovel engine. This Drag Specialties unit delivers OEM-level precision with the durability expected from a trusted aftermarket manufacturer...09402015- SKU:
- 09402015
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
- COLOR/FINISH:
- POLISHED
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- EACH
$762.15 -
DRAG SPECIALTIES ROCKER BOX SHOVEL CHR 80455
DRAG SPECIALTIES
$821.89Rocker boxes are critical to your Shovel's valve train integrity, and a quality replacement or upgrade directly impacts reliability and oil circulation efficiency. DRAG SPECIALTIES delivers chrome-finished rocker boxes engineered for proper fitment and...09402016- SKU:
- 09402016
- Availability:
- Ships Same Business Day
- Weight:
- 9.06 LBS
- TYPE:
- ROCKER BOX
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$821.89Qty in Cart: 0Quantity:Price:$821.89Subtotal: -
VANCE & HINES Exhaust Port Gaskets - Big Twin/XL 22899
VANCE & HINES
$16.95Exhaust port gaskets are a wear item that directly impacts your engine's combustion seal and overall performance reliability. A degraded or leaking gasket forces your engine to work harder, losing power and inviting exhaust leaks that compromise tuning...09341882- SKU:
- 09341882
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- TYPE:
- EXHAUST
$16.95 -
PAUGHCO Left Tool Box Mount - Softail 403C1
PAUGHCO
$64.95Proper footpeg clearance is critical when running a Softail with a left-side toolbox—inadequate spacing leads to uncomfortable riding position and potential interference issues. The PAUGHCO Left Tool Box Mount solves this with a spacer and extended bolt...DS273663- SKU:
- DS273663
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MOUNTING POSITION:
- LEFT
- RIDING STYLE:
- STREET
- TYPE:
- TOOLBOX
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- MOUNTING KIT
- UNITS:
- KIT
- BASE FINISH:
- CHROME
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal: -
PAUGHCO Engine Adapter Plate - 88A Twin Cam 741TC
PAUGHCO
$262.95Swapping a Twin Cam 88 "A" motor into a classic Softail or Rigid frame demands precision engineering—and this PAUGHCO adapter plate delivers exactly that. Rather than custom fabrication costs and months of downtime, this bolt-on solution lets you drop a...09330027- SKU:
- 09330027
- Availability:
- Ships Same Business Day
- Weight:
- 2.89 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- ADAPTER PLATE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$262.95Qty in Cart: 0Quantity:Price:$262.95Subtotal: -
PINGEL Rear Motor Mount - XL RM2
PINGEL
$212.95Stock motor mounts are engineering compromises—they prioritize cost over durability and fail under sustained high-RPM load and vibration. The PINGEL Rear Motor Mount RM2 eliminates that weakness with super-high-tensile alloy construction and strategic...DS243617- SKU:
- DS243617
- Availability:
- Ships Same Business Day
- Weight:
- 1.88 LBS
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- PRODUCT NAME:
- MOUNT
- UNITS:
- PAIR
$212.95 -
PRO-ONE PERF.MFG. Millen Point Cover - Big Twin 202110
PRO-ONE PERF.MFG.
$54.95A quality point cover does more than protect your ignition system—it's a foundational element of engine reliability and aesthetic presentation. The PRO-ONE PERF.MFG. Millen Point Cover delivers precision-engineered protection with a refined ball-milled...DS373964- SKU:
- DS373964
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- TYPE:
- POINT
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- MODEL:
- MILLENNIUM
- RIDING STYLE:
- STREET
$54.95 -
PRO-ONE PERF.MFG. Motor Mount - Chrome - EVO 204500
PRO-ONE PERF.MFG.
$159.45A quality motor mount is critical infrastructure for any performance build—it isolates vibration, maintains engine geometry under load, and directly impacts handling precision. The PRO-ONE PERF.MFG. Motor Mount delivers the rigidity and durability...09330019- SKU:
- 09330019
- Availability:
- Ships Same Business Day
- Weight:
- 1.61 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- MOTOR
- UNITS:
- EACH
- PRODUCT NAME:
- MOUNT
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET
$159.45Qty in Cart: 0Quantity:Price:$159.45Subtotal: -
NAMZ Hose Clamp - Chrome - 3/8" - 6-Pack NHC-CH206
NAMZ
$39.95Custom hose clamps are essential for any build where appearance matters as much as function. Chrome-finished brass clamps elevate the look of your braided oil and fuel lines while providing secure, reliable fastening that won't slip or corrode. Whether...07110212- SKU:
- 07110212
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- CLAMP
- TYPE:
- HOSE
- RIDING STYLE:
- STREET
- BASE FINISH:
- CHROME
- FITS HOSE SIZE METRIC:
- 9.5 MM
- MATERIAL:
- BRASS
- COLOR/FINISH:
- CHROME
- FITS HOSE SIZE IMPERIAL:
- 3/8'
- UNITS:
- 6 PACK
$39.95 -
TRASK Breather Kit - Big Twin DM-1999
TRASK
$249.95Engine breather systems are often overlooked, but they're critical to maintaining proper crankcase ventilation and preventing oil contamination. The TRASK Breather Kit eliminates oil misting before it fouls your intake charge, while improving oil...09200118- SKU:
- 09200118
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- KIT
- PRODUCT NAME:
- BREATHER VALVE
- MATERIAL:
- ALUMINUM
$249.95 -
TRASK Assault Cam Cover - Chrome - M8 TM-018CH
TRASK
$429.95The TRASK Assault Cam Cover lets you display your engine's internal machining while maintaining the clean aesthetic of the Assault air cleaner series. Chrome plating delivers corrosion resistance and a polished appearance that demands attention, whether...09401871- SKU:
- 09401871
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- TYPE:
- CAM
- UNITS:
- EACH
$429.95 -
TRASK Assault Cam Cover - Raw - Twin Cam TM-017R
TRASK
$429.95If you're running a Twin Cam engine with the TRASK Assault air cleaner system, a matching cam cover completes both the aesthetic and functional integrity of your top-end setup. The transparent design lets you monitor internal components at a glance while...09401848- SKU:
- 09401848
- Availability:
- Ships Same Business Day
- Weight:
- 2.85 LBS
- COLOR/FINISH:
- MACHINED
- TYPE:
- CAM
- UNITS:
- EACH
- COLOR/FINISH:
- RAW
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
$429.95Qty in Cart: 0Quantity:Price:$429.95Subtotal: -
TRASK Assault Cam Cover - Chrome - Twin Cam TM-017CH
TRASK
$429.95A quality cam cover does more than protect—it completes your engine's aesthetic while maintaining visibility of internal components you've invested in. The TRASK Assault Cam Cover delivers the visual precision and design cohesion that separates a...09401849- SKU:
- 09401849
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- TYPE:
- CAM
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$429.95 -
TRASK Assault Cam Cover - Black - Twin Cam TM-017BK
TRASK
$429.95Engine covers aren't just about aesthetics—they protect your twin cam from debris and heat while giving you real-time visibility into valve train operation. The TRASK Assault Cam Cover delivers the styling consistency your build demands while maintaining...09401850- SKU:
- 09401850
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- TYPE:
- CAM
- UNITS:
- EACH
- COLOR/FINISH:
- GLOSS
- RIDING STYLE:
- STREET
$429.95 -
TRASK Assault Cam Cover - Black - M8 TM-018BK
TRASK
$429.95Engine bay aesthetics matter when you're running a quality build, and the TRASK Assault Cam Cover delivers both visual appeal and functional clarity. This transparent cover lets you monitor internal engine components at a glance while maintaining a...09401872- SKU:
- 09401872
- Availability:
- Ships Same Business Day
- Weight:
- 2.35 LBS
- COLOR/FINISH:
- GLOSS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- TYPE:
- CAM
- UNITS:
- EACH
$429.95 -
ANDREWS High-Lift Upper Spring Collars 271100
ANDREWS
$53.95If you're running high-lift cams on your big twin, standard spring collars simply won't cut it. These ANDREWS high-lift collars are engineered to safely accommodate .600" lift cams without binding or geometry issues, ensuring reliable valve train...DS199735- SKU:
- DS199735
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- SPRING
- PRODUCT NAME:
- COLLAR
- UNITS:
- 4 PACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
$53.95 -
ANDREWS Cam Set - Twin Cam 288160
ANDREWS
$415.95The ANDREWS Cam Set - Twin Cam 288160 delivers measurable torque gains across the mid-range RPM band, making it an ideal upgrade for riders seeking improved low-to-mid performance without sacrificing stock reliability. This bolt-in cam integrates...DS199182- SKU:
- DS199182
- Availability:
- Ships Same Business Day
- Weight:
- 3.31 LBS
- EXHAUST CLOSE IMPERIAL:
- 22°
- EXHAUST DURATION IMPERIAL:
- 260°
- EXHAUST OPEN IMPERIAL:
- 58°
- INTAKE LIFT IMPERIAL:
- 0.560'
- INTAKE LOBE CENTERLINE IMPERIAL:
- 106°
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- EXHAUST LIFT AT TDC IMPERIAL:
- 0.192'
- EXHAUST LOBE CENTERLINE IMPERIAL:
- 108°
- GRIND:
- 60 SERIES
- INTAKE OPEN IMPERIAL:
- 24°
- TYPE:
- CHAIN
- EXHAUST LIFT IMPERIAL:
- 0.560'
- INTAKE DURATION IMPERIAL:
- 260°
- INTAKE CLOSE IMPERIAL:
- 56°
- INTAKE LIFT AT TDC IMPERIAL:
- 0.205'
- PRODUCT NAME:
- CAM KIT
$415.95 -
ANDREWS Cam Set - Twin Cam 288137G
ANDREWS
$463.95The ANDREWS Cam Set 288137G delivers measurable torque gains across the 1700-5200 RPM band, making it an ideal choice for riders who want more low-end punch without requiring extensive engine modifications. This bolt-in cam integrates seamlessly with...DS199247- SKU:
- DS199247
- Availability:
- Ships Same Business Day
- Weight:
- 3.02 LBS
- EXHAUST CLOSE IMPERIAL:
- 14°
- GRIND:
- 37 SERIES
- INTAKE CLOSE IMPERIAL:
- 38°
- INTAKE LOBE CENTERLINE IMPERIAL:
- 100°
- PRODUCT NAME:
- CAM KIT
- APPLICATION:
- INTAKE
- EXHAUST LIFT AT TDC IMPERIAL:
- 0.148'
- EXHAUST LIFT IMPERIAL:
- 0.510'
- EXHAUST LOBE CENTERLINE IMPERIAL:
- 106°
- EXHAUST OPEN IMPERIAL:
- 46°
- TYPE:
- GEAR
- APPLICATION:
- EXHAUST
- INTAKE DURATION IMPERIAL:
- 236°
- INTAKE LIFT IMPERIAL:
- 0.510'
- EXHAUST DURATION IMPERIAL:
- 240°
- INTAKE LIFT AT TDC IMPERIAL:
- 0.174'
- INTAKE OPEN IMPERIAL:
- 18°
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
$463.95
