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

S&S Cycle SH93 S&S Shovelhead Engine - Complete Harley Big Twin Motor
$9,399.95 $9,999.95

Cannonball Stealthstarter Electric Starter Kit Swingarm Frame 4 Speed 1958-1985 Harley-Davidson Big Twins
$4,157.63

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

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

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

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

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

Mid-USA Panhead OEM Style Springer Front End - Harley Big Twin 1936-1947
3 reviews $970.20

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Belt Drives LTD. 2" Open Belt Drive Kit - Black - 1990-2006 Harley-Davidson FXST/FLST
$2,655.20 $2,794.95

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

Cycle Electric Stator CE-8012 for 2006 - 2016 Harley-Davidson FLH and FLT Models
39 reviews $163.28 $174.78

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

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

Gasbox Upswept Exhaust Pipe Set for 1970-1984 Harley-Davidson Shovelhead Rigid Applications
$329.95

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

Gasbox Hi Lo Shotgun Exhaust Pipe Set 1970-1984 Harley-Davidson Shovelhead
9 reviews $279.99

Cycle Electric Generator DGV-5000-LH 12 Volt Low Voltage - 1936-1964 Harley-Davidsons w/Heli Coils
$548.72 $587.39

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

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

Cycle Standard 41MM Chrome Fork Tubes 1949-1976 Harley-Davidson FL - 26 inch - 6 Over
$201.76

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

Mullins Chain Drive 39mm Super Narrow Triple Trees Set
18 reviews $500.00

Cycle Standard 39MM Chrome Fork Tubes - 33 inch - 8 Over
1 review $282.90

Bates BattBoy Battery Box for Modern Gel or Li-Ion Batteries fits OEM-style Harley-Davidson Horseshoe Oil Tanks
25 reviews $149.09

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

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

Mid-USA 21 x 2.15 Chrome Complete Front Wheel fits Harley-Davidson FL Shovelheads 1973-1984
6 reviews $228.10

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

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

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

Lectron Lectron Billetron Carburetor for 53-100 Cubic Inch Harley-Davidsons
$899.00

Gasbox Upswept Exhaust Pipe Set 1948-1957 Harley-Davidson Rigid Panhead - Chrome
5 reviews $199.00

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

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

American Prime Mfg. Transmission Bearing Support
2 reviews $59.95

Cycle Standard Front Brake Master Cylinder Assembly - Chrome - Single Disc 1996-2017 Models (EXCEPT 15-17 Softail, 08-17 Dressers, Trike, 04-17 XL)
$188.86 $230.05

FNA Custom Cycle Twisty Transmission Plate - Harley-Davidson Big Twin 4 Speeds
3 reviews $240.00

Belt Drives LTD. 2 inch Shorty Belt Drive 1970-1978 Harley-Davidson Big Twins
$1,671.95 $1,759.95

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

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

Cycle Electric DGV-5000 12V Generator for Harley-Davidson 1965-1984
55 reviews $529.22 $566.51

Lowbrow Customs Motorcycle Neck Cup & Bearing Race Installer Tool
3 reviews $46.95

Cycle Standard 35MM Chrome Fork Tubes - 31-1/4 inch - 8 Over
1 review $189.62

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

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
36 reviews $50.00

Drag Specialties Friction Clutch Plate Kit (5-Pack) for 1968-1984 Harley Shovelhead
13 reviews $82.35

Cycle Standard 1936-1986 Harley-Davidson Big Twin 4 Speed Complete Kickstarter Rebuild Kit
$296.78

Cycle Standard 41MM Chrome Fork Tubes 1984-1999 Harley-Davidson FXWG/D FXST - 30-1/4 inch - 6 Over
$208.14

Lowbrow Customs Belt to Chain Conversion Kit Harley-Davidson Dyna 1994-99 - Chrome Sprocket
2 reviews $207.99

Marion Metalworks Universal Headlight Mounting Bracket/Eyebrow Delete
17 reviews $60.00

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

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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