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!
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- Price
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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: $1,723.95 -
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 -
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 -
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 -
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 - 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 -
ANDREWS Cam Set - Twin Cam 288155G
ANDREWS
$463.95The ANDREWS 288155G cam set delivers measurable torque gains across the 1700-5200 rpm range, making it an ideal upgrade for riders seeking improved low-to-mid power without sacrificing reliability. This bolt-in cam works seamlessly with stock valve...DS199249- SKU:
- DS199249
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- APPLICATION:
- EXHAUST
- EXHAUST CLOSE IMPERIAL:
- 20°
- EXHAUST LIFT IMPERIAL:
- 0.550'
- INTAKE OPEN IMPERIAL:
- 22°
- GRIND:
- 55 SERIES
- INTAKE CLOSE IMPERIAL:
- 46°
- INTAKE LIFT AT TDC IMPERIAL:
- 0.197'
- INTAKE LOBE CENTERLINE IMPERIAL:
- 102°
- UNITS:
- PAIR
- APPLICATION:
- INTAKE
- EXHAUST DURATION IMPERIAL:
- 252°
- EXHAUST LIFT AT TDC IMPERIAL:
- 0.181'
- EXHAUST LOBE CENTERLINE IMPERIAL:
- 106°
- EXHAUST OPEN IMPERIAL:
- 52°
- INTAKE DURATION IMPERIAL:
- 248°
- INTAKE LIFT IMPERIAL:
- 0.550'
- PRODUCT NAME:
- CAM KIT
- RIDING STYLE:
- STREET
- TYPE:
- GEAR
$463.95 -
SLYFOX COVER TIMING M8 MATTE CF 12056M
SLYFOX
$64.95Protect your M8 engine's timing cover while adding genuine carbon fiber aesthetic to your build. The SLYFOX timing cover combines lightweight durability with a refined matte finish that complements high-end engine bays. This is a direct bolt-on upgrade...09402030- SKU:
- 09402030
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- MATTE
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- TIMING
$64.95 -
ROCKER LOCKERS Rocker Locker Kit - Twin Cam - 10 Pack DK-RL-TC-10
ROCKER LOCKERS
$133.30Rocker arm tick is a persistent problem that compromises both engine reliability and ride quality on Twin Cam Harley-Davidsons. This kit eliminates the root cause—inconsistent wear patterns and play between the rocker arm shaft and bolt—by centering the...09500924- SKU:
- 09500924
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- BASE FINISH:
- NATURAL
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- SILVER
- COLOR/FINISH:
- WHITE
- BASE COLOR:
- BRASS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- ROCKER LOCKER
- TYPE:
- STOCK
- UNITS:
- 10 PACK
$133.30 -
ROCKER LOCKERS Rocker Locker Kit - XL DK-RL-SPT
ROCKER LOCKERS
$24.95Harley rocker arm tick is more than just annoying—it's a sign that your rocker plates are wearing unevenly and your valve train geometry is compromised. The ROCKER LOCKERS XL kit solves this by centering your rocker plate and eliminating the play between...09500925- SKU:
- 09500925
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- SILVER
- COLOR/FINISH:
- WHITE
- UNITS:
- KIT
- PRODUCT NAME:
- ROCKER LOCKER
- TYPE:
- STOCK
- BASE COLOR:
- BRASS
- BASE FINISH:
- NATURAL
- RIDING STYLE:
- STREET
$24.95 -
On Sale
ROCKER LOCKERS Rocker Locker Kit - XL - 10 Pack DK-RL-SPT-10
ROCKER LOCKERS
Now: $35.00Was: $54.00Rocker arm tick is more than an annoyance—it's a sign that your rocker plates are shifting under load, creating uneven wear patterns that accelerate component degradation. The ROCKER LOCKERS XL Kit solves this problem by centering your rocker plates and...09500926- SKU:
- 09500926
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- SILVER
- COLOR/FINISH:
- WHITE
- TYPE:
- STOCK
- BASE COLOR:
- BRASS
- BASE FINISH:
- NATURAL
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- ROCKER LOCKER
- UNITS:
- 10 PACK
Now: $35.00Was: $54.00 -
ROCKER LOCKERS Rocker Locker Kit - 86-06 XL DK-RL-SPT-8606
ROCKER LOCKERS
$24.95Harley rocker arm tick is more than just an annoying noise—it's a sign that your rocker plates are shifting under load, causing uneven wear and potential valve train instability. The ROCKER LOCKERS Rocker Locker Kit eliminates this problem by centering...09500927- SKU:
- 09500927
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BASE COLOR:
- BRASS
- RIDING STYLE:
- STREET
- TYPE:
- STOCK
- UNITS:
- KIT
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- SILVER
- BASE FINISH:
- NATURAL
- COLOR/FINISH:
- WHITE
- PRODUCT NAME:
- ROCKER LOCKER
$24.95
