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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Cannonball Stealthstarter Electric Starter Kit Rigid Frame 4 Speed Harley-Davidson Big Twins
3 reviews $3,894.96

Cycle Standard 39MM Chrome Fork Tubes - 31 inch - 6 Over
20 reviews $257.77

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

Mid-USA 6 Speed Transmission - Polished Finish - 1990-1999 Harley-Davidson Softail
$1,289.00 $1,451.70

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

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

Lowbrow Customs Rogue Fender - 1958-84 Harley-Davidson Panhead Shovelhead
129 reviews $318.57

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1-Inch Diameter - Chrome
29 reviews From $143.12

Dynatek Performance Electronics Dyna S Ignition Complete Kit - Dual Fire for Harley Davidson
19 reviews $264.29

Lowbrow Customs 21" Front Ribbed Spool Wheel - 3/4" Bearings - Chrome
24 reviews $346.78

Cycle Standard 39MM Chrome Fork Tubes - 35 inch - 10 Over
$313.69

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

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1965-1978 Harley-Davidson Big Twins
$608.74 $627.95

Mid-USA 6 Speed Transmission - Black Finish - 1990-1999 Harley-Davidson Softail
$1,289.00 $1,443.75

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

Belt Drives LTD. 2" SS Belt Drive - Without Cover - 1990-2006 Harley-Davidson FXST/FLST
$2,338.94 $2,411.95

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons
9 reviews $320.27

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

Gasbox Bolt-On Oil Tank for Rigid Harley-Davidson Big Twin Frames with Electric Start
1 review $299.99

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

Cycle Standard Bobbed Rear Fender Without Light Mount for 1984-1999 Harley-Davidson Softail
5 reviews $185.88

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

Mid-USA 6 Speed Transmission - Cast Finish - 1990-1999 Harley-Davidson Softail
$1,150.00 $1,414.70

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

Mid-USA 16 x 3.00 Black Complete Rear Wheel fits all Harley-Davidson 1979-1999
11 reviews $203.25

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

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

Gasbox 007 Stainless Air Cleaner for 1991-2022 Harley-Davidson CV Carburetor/EFI
39 reviews $99.95

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

Morris Magneto 74LDMD Dual Magneto Setup for Alternator Big Twin Harley Davidsons - Brushed Finish
$3,101.96

Cycle Standard 39MM Chrome Fork Tubes - 27 inch - 2 Over
1 review $209.58

American Prime Mfg. Complete Comp Master Clutch fits 1936-1984 Harley-Davidson Pre-EVO Big Twin
1 review $639.76

Lowbrow Customs 39mm Tapered Fork Lowers - Aluminum
1 review $344.06

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

S&S Cycle Super E Carburetor Kit 1966-78 Harley-Davidson Shovelhead
4 reviews $729.73 $799.95

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

Cycle Electric CE-8010-08 Stator Replacement for 2008-2017 Harley Dyna & Softail OEM #30017-08
22 reviews $163.88 $175.43

Cannonball Lion Battery Box for Li-Ion Batteries 1936-1964 Harley-Davidson OHV Big Twin 1937-1948 SV Big Twin
$463.52

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Electric Start - 1979-E1984 Harley-Davidson Big Twins
1 review $694.40 $730.95

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

Mid-USA 16 x 3.00 Chrome Complete Rear Wheel fits all Harley-Davidson 1979-1999
27 reviews $179.46 $190.85

Morris Magneto MM2 Magneto for 1971-1980 Harley-Davidson XL - Brushed Finish
$1,295.00

Cycle Standard 5 Stud Clutch Hub Assembly - Harley-Davidson Big Twins 1941-1984 OEM #37550-41B
6 reviews $114.25

Lowbrow Customs T-Bars Handlebars - 12 Inch Rise - 1 inch Diameter - Chrome
5 reviews $144.14

Lowbrow Customs Narrow Rabbit Ears Handlebars - 1 inch - Chrome
47 reviews From $143.17

Morris Magneto T5 Twin Cam Magneto for Harley Davidson - Brushed Finish
$2,453.41

Belt Drives LTD. 2" Open Belt Drive Kit - Polished - 1990-2006 Harley-Davidson FXST/FLST
2 reviews $2,429.10 $2,556.95

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

Mid-USA 21 x 2.15 Black Complete Front Wheel fits Harley-Davidson Sportster XL & FX 1984-1999
13 reviews $334.00

Cycle Standard Chrome Kickstand Kit - 1966 - 1986 Harley-Davidson FL FX
15 reviews $116.39

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
38 reviews $50.00

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

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

S&S Cycle HI-4N Ignition Module Kit - 1970-1999 Harley-Davidson Big Twins 1971-1990 XL
1 review $550.04 $599.95

S&S Cycle Super E Carburetor Kit 1979-84 Harley-Davidson Shovelhead
2 reviews $756.20 $799.95

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

Lowbrow Customs T-Bars Handlebars - 12 Inch Rise - 1 inch Diameter - Black
1 review $144.14

Lowbrow Customs Rear Suspension Delete Kit 1984-1999 Harley-Davidson Softails
$194.66

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 $557.00

American Prime Mfg. Transmission Bearing Support
4 reviews $59.95

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

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

Drag Specialties 5 ohm Dual Fire Coil - for Points Ignition
16 reviews $80.20

Gasbox Upswept Exhaust Pipe Set for 1948-1965 Harley-Davidson Panhead Rigid Applications
$389.95

Morris Magneto MM74L Magneto for Alternator Big Twin Harley Davidsons with Aftermarket Cases - Brushed Finish
$1,942.38

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

Cycle Standard Front Brake Master Cylinder Assembly - Black - Single Disc 1996-2017 Models (EXCEPT 15-17 Softail, 08-17 Dressers, Trike, 04-17 XL)
$194.71

American Prime Mfg. Comp Master Ignition Advance Unit - 1970-Up Harley-Davidson Replaces OEM #3251770T
6 reviews $88.21

S&S Cycle Replacement 4 Speed Kicker Cover Kit - Aluminum
2 reviews $234.69 $255.95

Lowbrow Customs Louvered Air Cleaner for Harley CV / EFI 1991-2020 - Chrome
81 reviews $81.78

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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