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

Sort by

Lowbrow Customs WX Split Gas Tanks - Bolt-On for 1936 - 1984 Big Twin Harley-Davidsons - 2.25 gallon
82 reviews $399.99

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

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

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
10 reviews $469.95 $499.95

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

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

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

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

S&S Cycle Super E Carburetor Kit 1966-78 Harley-Davidson Shovelhead
3 reviews $719.96 $799.95

Lowbrow Customs T-Bars Handlebars - 12 Inch Rise - 1 inch Diameter - Chrome
$133.28

Dynatek Performance Electronics Dyna S Ignition Complete Kit - Dual Fire for Harley Davidson
17 reviews $233.32

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1-Inch Diameter - Chrome
23 reviews From $132.33

Cycle Electric Alternator Kit 32 amp CE-32A - Harley-Davidson Evo Big Twins
3 reviews $363.15 $388.74

Cycle Electric Generator DGV-5000L 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
41 reviews $533.87 $571.48

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

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

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

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

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

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

Lowbrow Customs 39mm Narrow Triple Trees Kit
$399.99

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons
5 reviews $288.88

Lowbrow Customs Big Twin Harley-Davidson Engine Stand (1936-1999) - Fits Knucklehead, Panhead, Shovelhead, Evo Motors
49 reviews $62.39

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

Cycle Standard 35MM Chrome Fork Tubes - 27-1/4 inch - 4 Over
3 reviews $180.20

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

Lowbrow Customs Rear Suspension Delete Kit 1984-1999 Harley-Davidson Softails
$179.99

Lowbrow Customs Springer Top Clamp for Standard 3.5" Handlebar Risers
3 reviews $187.19

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

Lowbrow Customs Motorcycle Neck Cup & Bearing Race Installer Tool
$44.71

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

Trader Cody's Choppers Midway Mid Controls 1970-1984 Harley-Davidson Shovelhead 1984-1999 Evo - Black
$355.00

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

V-Twin Manufacturing Chrome Fork Neck Cup Kit with Fork Stops for Harley-Davidson Big Twins
9 reviews $78.22

Gasbox Bolt-On Oil Tank for Rigid Harley-Davidson Big Twin Frames 1936-57
10 reviews $299.99

Cycle Electric Generator DGV-5000-BLK 12 Volt - 1965-1984 Harley-Davidson - Blacked Out
2 reviews $520.87 $557.57

Cycle Standard Bobbed Rear Fender Without Light Mount for 1984-1999 Harley-Davidson Softail
$171.87

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

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

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

Cycle Standard 35MM Chrome Fork Tubes - 31-1/4 inch - 8 Over
$184.10

Cycle Standard Smooth Stainless Steel Hidden / Internal Fork Stop Kit 1949-1987 Harley-Davidson Big Twins
$106.07

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

Trader Cody's Choppers Midway Mid Controls 1970-1984 Harley-Davidson Shovelhead 1984-1999 Evo - Chrome
$450.00

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 5 Speed - Sporty Tank Mounts - Horseshoe Oil Tank
$1,799.00

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 - Sporty Tank Mounts - Horseshoe Oil Tank
$1,799.00

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

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

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

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

Andrews 4-Speed Gear Set 1936-76 Harley-Davidson Big Twin - Close Ratio
$881.06 $978.95

Cycle Standard Wagner Lockheed Type Rear Disc Brake Master Cylinder - Chrome - 1973-E1979 Harley-Davidson FL/FX
$99.84

Gasbox Shovelhead Exhaust Pipe Set 2-into-1 for 1970-84 Harley Cone - Bare Steel OEM # 65435-70
24 reviews $214.99

Cycle Standard 35MM Chrome Fork Tubes - 29-1/4 inch - 6 Over
2 reviews $190.54

Lowbrow Customs Narrow Rabbit Ears Handlebars - 1 inch - Chrome
40 reviews From $132.38

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

Cycle Standard Filler Neck- Thread In Style Gas Cap Weld In Bung- Right Hand Thread -1996 & Up Caps - Vented
8 reviews $11.75

Lowbrow Customs 39mm Tapered Fork Lowers - Aluminum
$334.04

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

S&S Cycle HI-4N Ignition Module Kit - 1970-1999 Harley-Davidson Big Twins 1971-1990 XL
$539.96 $599.95

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

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

Cycle Standard Bayonet / Cam Harley Style Vented 2" Gas Cap - Chrome
52 reviews $18.56

Cycle Standard Fat Bob Style Gas Tanks - 1948-1984 Harley-Davidson FX/FL - 3.5 Gallon
$276.46

Cycle Electric Generator DGV-5000-L-BLK 12 Volt - Low Voltage - 1965-84 Harley-Davidson - Blacked Out
$525.51 $562.54

Bar-None Moto BNM Two-Up Bolt On Sissy Bar For Rogue Fender - 1958-1984 Harley-Davidson Panhead/Shovelhead
$307.02

Fast Eddy Co. No. 29 Driver Handle with Wedge Spacer
5 reviews $79.95

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
25 reviews $50.00

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.

Read less

Harley-Davidson Big Twin Parts FAQ

STAY CONNECTED
WITH LOWBROW

NO SPAM, EVER. JUST GREAT STUFF. YOUR INFO IS NEVER SHARED.