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 3 & 4 Speed Harley-Davidson Big Twins
3 reviews $3,894.96

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

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

Belt Drives LTD. 2" SS Belt Drive - Without Cover - 1990-2006 Harley-Davidson FXST/FLST
$2,790.51 $2,937.38

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

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

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

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

Mid-USA 6 Speed Transmission - Cast Finish - 1990-1999 Harley-Davidson Softail
$1,089.00 $1,414.70

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

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

Morris Magneto MM74e Magneto for Harley Davidson Big Twins 1936 - 1969 Pan / Shovel - Brushed Finish
6 reviews $1,359.75

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

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1965-1978 Harley-Davidson Big Twins
$726.39 $764.62

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

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

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

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

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

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

Cycle Standard 39MM Chrome Fork Tubes - 29 inch - 4 Over
6 reviews $252.07

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

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

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

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

Dynatek Performance Electronics Dyna S Ignition Complete Kit - Dual Fire for Harley Davidson
19 reviews $277.77

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons
9 reviews $330.71

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

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

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)
2 reviews $188.86 $230.05

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

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

Lowbrow Customs 21" Front Ribbed Spool Wheel - 3/4" Bearings - Black
9 reviews $351.33

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

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

Prism Supply Co. Sling Shot Clutch Control - Harley-Davidson 5 & 6 Speed - Stainless Steel
4 reviews $324.99

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

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
39 reviews $50.00

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 Belt To Chain Conversion Kit 1995-1999 Harley-Davidson Softail - Chrome Sprocket
3 reviews $159.99

Lowbrow Customs Belt To Chain Conversion Kit 1984-1994 Harley-Davidson Softail - Chrome Sprocket
$188.99

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

Lowbrow Customs 39mm Narrow Triple Trees Kit
3 reviews $449.99

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

Cycle Standard 39MM Chrome Fork Tubes - 33 inch - 8 Over
2 reviews $291.39

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

Morris Magneto MM74L Magneto for Alternator Big Twin Harley Davidsons 1974 - 1992 - Brushed Finish
2 reviews $1,942.38

Cycle Standard 41MM Chrome Fork Tubes 1984-1999 Harley-Davidson FXWG/D FXST - 30-1/4 inch - 6 Over
$214.38

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

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

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

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 4 Speed - Frisco Tank Mounts - Horseshoe Oil Tank
4 reviews $1,799.00

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

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

Til Death Cycles 49mm Harley-Davidson Front End Extended Damper Tube Kit
5 reviews $119.12

Cycle Standard Isolator Motor Mount - Front - 1991-2017 Harley-Davidson Dyna
7 reviews $117.41

American Prime Mfg. Transmission Bearing Support
4 reviews $59.95

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

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

Mid-USA 16 x 3.00 Chrome Complete Front / Rear Wheel fits Harley-Davidson Big Twins 1973-1984
15 reviews $202.75

Belt Drives LTD. 8mm/2 inch Primary Open Belt Drive - Kick Start - Spline Shaft - 1955-1984 Harley-Davidson Big Twin
$808.37 $850.92

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

Fast Eddy Co. No. 20 Pinion Gear Locking Tool 1954-1999 Harley Big Twins
8 reviews $99.95

V-Factor Motorcycle Parts Lever Action Starter Solenoid 1965-1986 Harley-Davidson Big Twin 4 Speed 1984-1988 Softail - Chrome
10 reviews $131.95

Lowbrow Customs Premium Stainless Steel Intake Clamp & Seal Kit 1955-1977 Harley-Davidson FL/FX/XL
16 reviews $33.63

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

Cycle Standard Bayonet / Cam Harley Style Vented 2" Gas Cap - Chrome
54 reviews $22.46

Lowbrow Customs 39mm Solid Handlebar Riser Bushings for Harley-Davidson - Aluminum
35 reviews $36.98

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

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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