Which models are considered Big Twins?

Big Twins refer to larger displacement Harley-Davidsons, including Flathead, Knucklehead, Panhead, Shovelhead, Evo, and Twin Cam.

Do I need any special tools for installing custom Big Twin parts?

Basic hand tools usually suffice, but some installations (like welding) may require specialized equipment or professional assistance.

Can I return items if they don’t fit my Big Twin?

Absolutely. As long as the part is in original, unused condition, you can return it according to our standard return policy.

Harley-Davidson Big Twin Parts

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Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1965-1978 Harley-Davidson Big Twins
$596.55 $627.95

S&S Cycle S&S Super E Carburetor Assembly - fits Harley Big Twin & Sportster
12 reviews $469.95 $499.95

Cycle Standard 39MM Chrome Fork Tubes - 33 inch - 8 Over
2 reviews $282.90

Lowbrow Customs Rogue Fender - 1958-84 Harley-Davidson Panhead Shovelhead
126 reviews $309.29

S&S Cycle V80 Series Complete Assembled Evo Long Block Engine - Wrinkle Black
1 review $6,673.95 $7,099.95

Mid-USA 6 Speed Transmission - Black Finish - 1990-1999 Harley-Davidson Softail
$1,250.00 $1,443.75

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1-Inch Diameter - Chrome
28 reviews From $136.30

Gasbox Bolt-On Horseshoe Oil Tank for 1965-Up Harley Four-Speed Swingarm Frames
27 reviews $299.99

Cycle Electric Generator DGV-5000L 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
42 reviews $543.94 $582.26

Mid-USA 6 Speed Transmission - Polished Finish - 1990-1999 Harley-Davidson Softail
$1,250.00 $1,451.70

Mid-USA Harley Sportster 21" Front Wheel - Chrome Finish
15 reviews $332.40

Lowbrow Customs Narrow Rabbit Ears Handlebars - 1 inch - Chrome
44 reviews From $136.35

Dynatek Performance Electronics Dyna S Ignition Complete Kit - Dual Fire for Harley Davidson
19 reviews $239.99

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons
8 reviews $296.65

Morris Magneto G5 Magneto for Big Twin Harley Davidsons 1936 - 1969 - Brushed Finish
1 review $2,195.00

Cycle Electric DGV-5000 12V Generator for Harley-Davidson 1965-1984
56 reviews $543.94 $582.26

Cannonball Stealthstarter Electric Starter Kit Swingarm Frame 4 Speed 1958-1985 Harley-Davidson Big Twins
$4,260.63

Mid-USA Forward Controls 1936-1999 Harley-Davidson Big Twin - 5/8" Bore - Polished Billet
4 reviews $399.95

Cycle Electric Alternator Kit 32 amp CE-32AR for Harley-Davidson Evo Big Twins
4 reviews $367.45 $393.34

Gasbox Full Rigid Chopper Frame 1936-1999 Harley-Davidson Big Twin 5 Speed - 3" Up - Frisco Tank Mounts - Horseshoe Oil Tank
1 review $1,799.00

Gasbox Full Rigid Frame 1936-1999 Harley-Davidson Big Twin 5 Speed - Frisco Tank Mounts - Horseshoe Oil Tank
$1,799.00

Gasbox Full Rigid Frame 1936-1999 Harley-Davidson Big Twin 4 Speed - Frisco Tank Mounts - Horseshoe Oil Tank
3 reviews $1,799.00

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1979-E1984 Harley-Davidson Big Twins
$596.55 $627.95

Til Death Cycles 39mm Extended Damper Tube Kit- Harley-Davidson Front End
28 reviews $104.95

Lowbrow Customs Weld-On Hardtail Frame 1958-1984 Harley-Davidson Panhead & Shovelhead
$699.99

Gasbox Exhaust Pipe Set 2-into-1 1970-84 Harley Cone Shovelhead - Chrome OEM #65435-70
14 reviews $279.99

Lowbrow Customs T-Bars Handlebars - 12 Inch Rise - 1 inch Diameter - Chrome
4 reviews $137.28

Gasbox Bolt-On Oil Tank for Rigid Harley-Davidson Big Twin Frames 1936-1957
10 reviews $299.99

Cycle Electric Generator DGV-5000-LH 12 Volt Low Voltage - 1936-1964 Harley-Davidsons w/Heli Coils
$557.87 $597.17

Old-Stf Cycle Centerline Adjustable Aluminum Transmission Plate - Harley-Davidson Big Twin 4 Speeds
4 reviews $249.00

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
36 reviews $50.00

Mullins Chain Drive 41mm Super Narrow Triple Trees Set
1 review $500.00

Cycle Standard Bobbed Rear Fender Without Light Mount for 1984-1999 Harley-Davidson Softail
4 reviews $177.03

Belt Drives LTD. 8mm/2 inch Primary Open Belt Drive - Kick Start - Spline Shaft - 1955-1984 Harley-Davidson Big Twin
$619.35 $651.95

Cycle Standard 39MM Chrome Fork Tubes - 27 inch - 2 Over
1 review $203.48

Fiorucci Fabrications 1948-1999 Harley-Davidson Aluminum Head Motor Machining Fixture
$799.00

American Prime Mfg. Complete Comp Master Clutch fits 1936-1984 Harley-Davidson Pre-EVO Big Twin
1 review $597.11

Lowbrow Customs 39mm Tapered Fork Lowers - Aluminum
1 review $334.04

Belt Drives LTD. 2" SS Belt Drive - Without Cover - 1990-2006 Harley-Davidson FXST/FLST
$2,291.35 $2,411.95

Cycle Electric Stator CE-8012 for 2006 - 2016 Harley-Davidson FLH and FLT Models
39 reviews $165.80 $177.48

FNA Custom Cycle Tite Seal Intake Manifold Kit for 1948-1984 Harley Big Twin & Sportster
64 reviews $55.95

Lowbrow Customs Belt To Chain Conversion Kit 1984-1994 Harley-Davidson Softail - Chrome Sprocket
$179.99

Cycle Standard Filler Neck- Thread In Style Gas Cap Weld In Bung- Right Hand Thread -1996 & Up Caps - Vented
8 reviews $12.93

Cycle Electric CE-84T-99 Stator Rotor and Regulator Kit for 1999 - 2003 Harley-Davidson FLH and FLT Models
21 reviews $545.16 $583.57

Cycle Standard 39MM Chrome Fork Tubes - 35 inch - 10 Over
$304.55

Cycle Standard Bayonet / Cam Harley Style Vented 2" Gas Cap - Chrome
53 reviews $20.42

Cycle Electric Generator DGV-5000-L-BLK 12 Volt - Low Voltage - 1965-84 Harley-Davidson - Blacked Out
2 reviews $535.58 $573.32

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons - Includes Module and DC-6-5 Twin Fire II Mini Coil
2 reviews $513.32

Lowbrow Customs 21" Front Ribbed Spool Wheel - 3/4" Bearings - Black
9 reviews $341.10

V-Twin Manufacturing Chrome Fork Neck Cup Kit for Harley-Davidson Big Twins
11 reviews $78.37

Lowbrow Customs 39mm Narrow Triple Trees Kit
3 reviews $399.99

Lowbrow Customs Louvered Air Cleaner for Harley CV / EFI 1991-2020 - Chrome
80 reviews $76.43

James Gaskets 39mm Narrowglide Fork Seal Rebuild Kit 1988-Up Harley Sportster
20 reviews $26.09

Prism Supply Co. Quick Stick Start Lever 2.0 1991-Up Harley-Davidson Sportster 1989-Up Big Twin - Matte Aluminum
4 reviews $119.99

S&S Cycle Super E Carburetor Assembly - Black #110-0133
$494.96 $549.95

Mid-USA Forward Controls 1936-1999 Harley-Davidson Big Twin - 5/8" Bore - Black Billet
1 review $383.40

Lowbrow Customs Big Twin Harley-Davidson Engine Stand (1936-1999) - Fits Knucklehead, Panhead, Shovelhead, Evo Motors
53 reviews $65.51

Cycle Electric LeBeef Generator DGV-5000-L-CP 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
$638.37 $683.35

Cycle Electric LeBeef Generator DGV-5000-CP 12 Volt - 1965-1984 Harley-Davidsons
$638.37 $683.35

Cycle Standard Smooth Stainless Steel Hidden / Internal Fork Stop Kit 1949-1987 Harley-Davidson Big Twins
1 review $109.25

Drag Specialties 5 ohm Dual Fire Coil - for Points Ignition
16 reviews $77.95

Gasbox Full Rigid Chopper Frame 1936-1999 Harley-Davidson Big Twin 4 Speed - 3" Up - Frisco Tank Mounts - Horseshoe Oil Tank
$1,799.00

Gasbox Full Rigid Frame 1936-1999 Harley-Davidson Big Twin 5 Speed - Sporty Tank Mounts - Horseshoe Oil Tank
$1,799.00

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1955-1964 Harley-Davidson Big Twins
$596.55 $627.95

Cycle Standard Exhaust Flange Kit H-D 1984-13 Big Twins and 1986-13 XL OEM #65328-83 65325-83
18 reviews $32.96

Cycle Standard Wagner Lockheed Type Rear Disc Brake Master Cylinder - Chrome - 1973-E1979 Harley-Davidson FL/FX
1 review $104.83

Lowbrow Customs Belt To Chain Conversion Kit 1995-1999 Harley-Davidson Softail - Chrome Sprocket
1 review $159.99

Timken Neck Post Bearing & Race Set Made in USA
17 reviews $28.14

Cycle Standard 39MM Chrome Fork Tubes - 29 inch - 4 Over
5 reviews $244.73

Lowbrow Customs 39mm Solid Handlebar Riser Bushings for Harley-Davidson - Aluminum
33 reviews $33.62

Cannonball Springbrake Disc Brake Kit for I-Beam And Classic Springer Forks - Star Hub
1 review $1,656.10

Harley-Davidson Big Twin motorcycles are legendary for their raw power, distinctive style, and unmatched capacity for customization. From the Flathead and Knucklehead to the Panhead, Shovelhead, Evo, and Twin Cam, each Big Twin engine carries its...

If you’re looking to transform your ride—enhancing speed, comfort, or that unmistakable retro look—explore our Harley-Davidson Big Twin Parts collection. We have everything you need to customize your bike, whether you’re focusing on performance upgrades or eye-catching aesthetics.

Why Upgrade a Harley-Davidson Big Twin?

Boundless Customization: Big Twins allow for radical transformations—from stripped-down bobbers to vintage choppers—letting you express your unique vision.
Enhanced Performance: Boost horsepower, torque, and responsiveness with high-quality ignition kits, carburetors, and more.
Personalized Aesthetics: Whether it’s a retro-inspired racer or a comfortable tourer, your bike can reflect your style and riding needs.

Why Buy Big Twin Motorcycle Parts at Lowbrow Customs?

We curate top brands and rigorously test products for durability, fitment, and performance before shipping them out.
Variety of Choices: We offer a carefully curated selection of motorcycle parts for a wide range of Big Twin engines—from the Flathead and Knucklehead to the Panhead, Shovelhead, Evo, and Twin Cam—so you can find the perfect fit for your ride.
Expert Guidance: Need advice on installing a gas tank or swapping out your ignition? Our dedicated staff is here to help—from how-to videos to step-by-step articles.
Passion for Custom Builds: We’re not just sellers—we’re fellow riders who believe in the art of motorcycle customization. Count on our expertise to bring your dream bike to life.
Wide Selection & Fast Shipping: Our warehouse in northeast Ohio is stocked daily, ensuring you get the parts you need quickly. Plus, enjoy free economy shipping on U.S. orders over $99 and flexible return policy within 90-day & no return fee.

Our Featured Big Twin Motorcycle Parts Products

Ignition Kits & Carburetors: Gain more power and better throttle response by upgrading your ignition and carb system. A refined setup can increase speed, torque, and overall rideability.
Custom Gas Tanks: Our Big Twin gas tanks are crafted from high-grade steel, pressure-tested to prevent leaks, and available in multiple shapes and capacities. Achieve the perfect balance between form and function.
Handlebars & Controls: From vintage ape hangers to sporty drag bars, our collection of handlebars offers different heights, widths, and designs. Complete the setup with controls like grips, mirrors, and brake/clutch assemblies for a cohesive look.
Retro Accessories: Elevate your Big Twin’s retro appeal with add-ons like vintage-inspired seats, windshield options, saddle bags, or even a top-mounted box for touring. Personalizing these details completes the old-school charm.

Ready to Customize Your Harley-Davidson Big Twin?

Explore our Harley-Davidson Big Twin Parts collection today and transform your ride into the perfect blend of power, comfort, and style. If you have questions, reach out to our expert support team or dive into our installation guides for pro tips. Let’s make your dream bike a reality—shop now and gear up for the open road.

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Harley-Davidson Big Twin Parts FAQ

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