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 Deluxe Choke Knob Enricher for Harley-Davidson S&S Super E and G Carburetors - Chrome
45 reviews $44.19

Lowbrow Customs Speedometer Gauge Riser Mount for 1 inch T-Bar Handlebars - Polished
20 reviews $100.89

Progressive Suspension Heavy-Duty Fork Springs 1999-2005 Harley-Davidson FXD FXDC FXDL 2004-15 XL Models
3 reviews $139.95

James Gaskets Complete Motor Gasket Kit - Shovelhead 1966 - 1984
8 reviews $116.17

Drag Specialties Fat Bob Flatside Style Gas Tanks - 1984-1999 Harley-Davidson FXST/FLST 1985-1986 FX/FXWG - 3.5 Gallon
$348.09

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

Prism Supply Co. 4 inch Mid-Pegs - Harley-Davidson Cone Shovelhead and Evo Big Twins - Open Primary
1 review $98.99

Timken Harley Timken Wheel Bearings - OEM #9033 & 9052 Replacement
14 reviews $22.25

Cycle Standard 5 Post Ignition Key Switch Replaces Harley-Davidson OEM #71500-36T - Chrome Bezel
7 reviews $45.95

S&S Cycle Super E Manifold Conversion Kit for 80" Harley-Davidson Evolution
1 review $229.46 $254.95

S&S Cycle High Performance Hydraulic Tappet Set - 1984-99 Harley-Davidson Big Twin 1986-90 XL
1 review $343.76 $381.95

Mooneyes MOON Pressure Gauge 0-100 psi
5 reviews $49.00

Lowbrow Customs Lowbrow Customs Springer Buckhorn Handlebars - 1 inch - Raw
$171.38

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1 inch Diameter - Black
25 reviews From $136.11

Lowbrow Customs Rabbit Ears Handlebars - 1 inch - Black
19 reviews From $135.85

Prism Supply Co. Motor Mount Mid-Pegs for Harley-Davidson Big Twins - Stainless Steel
$84.99

Gasbox Strong Arm Top Motor Mount With Crank Key Mount 1948-1984 Harley Big Twins
5 reviews $74.95

Cycle Standard 41MM Chrome Fork Tubes 1984-1999 Harley-Davidson FXWG/D FXST - 24-1/4 inch
$167.43

Cycle Standard Drilled Stainless Steel Brake Rotor - 11.5 inches - Replaces Harley-Davidson OEM #44156-00
4 reviews $95.22

Lowbrow Customs Rogue Rear Fender Strut Set 1958 - 1984 Harley-Davidson Panhead Shovelhead
17 reviews $95.21

LCFabrications Brake Switch Pod Delete - Black - for H-D
28 reviews $35.00

Colony #3020-8 Head Bolt Set 12 Point 1992-Up Harley-Davidson Big Twin/Twin Cam 1993-Up XL - Zinc Plated
3 reviews $83.00

S&S Cycle 2.5 inch Velocity Stack for S&S Super E/G Carburetor
1 review $165.56 $183.95

Cycle Standard 3 position Ignition Key Switch Replaces Harley-Davidson OEM #71425-77 - Chrome Bezel
84 reviews $31.49

Cycle Standard Drilled Stainless Steel Brake Rotor - 10 inches - Replaces Harley-Davidson OEM #44137-77A
2 reviews $94.29

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

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

Fast Eddy Co. No. 49 Neck Cup Removers
5 reviews $54.95

Belt Drives LTD. 11mm/1.5 inch Primary Belt Drive with Idler Gear - Electric Start - 1965-E1984 Harley-Davidson Big Twin
2 reviews $659.25 $693.95

Belt Drives LTD. 8mm/3 inch Primary Open Belt Drive - Kick Start - Spline Shaft - 1955-1984 Harley-Davidson Big Twin
1 review $657.35 $691.95

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Left Hand Outlet
30 reviews $36.46

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

Cycle Electric Rectifying Regulator CE-608 - 2009-2013 Harley-Davidson FLH FLT Models with Low Mount Oil Cooler
20 reviews $217.85 $233.20

James Gaskets Exhaust Port Gasket Kit - Thick Graphite Wire Gaskets & Hex Nuts - 1984-Up Harley-Davidson Evo/Twin Cam 1986-2022 XL
$24.95

Cycle Standard Mini 2:1 ratio Mechanical Speedometer with Trip Meter - 2.4 inch
12 reviews $92.02

Lowbrow Customs Lowbrow Customs Springer Lil Speedies Handlebars - 1 inch - Raw
4 reviews $160.67

Drag Specialties Brake/Mechanical Clutch Controls Kit with Switches - Chrome - Single Disc 1996-11 Harley-Davidson FXD/FXDWG 96-03 XL 96-07 FLHR 96-10 FXST/FLST
$636.49

LCFabrications Clutch Switch Pod Delete - Black - for H-D
28 reviews $35.00

Lowbrow Customs Lowbrow Customs Springer Buckhorn Handlebars - 1 inch - Chrome
$207.99

Cycle Standard Hidden / Internal Fork Stop Kit Harley-Davidson Big Twins
$77.54 $103.38

Cycle Standard 10-stud Clutch Hub Puller
23 reviews $47.66

Cycle Standard Springer Style Bottom Mount Headlight - Chrome
11 reviews $101.93

Cycle Standard Universal Fork Boot Gaiter Set for 41mm Front Forks
11 reviews $43.45

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

Cycle Standard Chrome Mesh CV Carb Air Cleaner - Sportster & Big Twin Harley
41 reviews $100.05

Fast Eddy Co. No. 22 Engine Rotation Socket - 10 Spline for 1955-2006 Harley-Davidson Big Twin
4 reviews $74.95

Bates S&S Super E/G Carburetor Adapter for Bendix Style Oval Harley Air Cleaners
11 reviews $149.22

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

Mooneyes 3 quart Traditional Chopper Oil Tank for Harley-Davidson Choppers
9 reviews $295.00

Lowbrow Customs Throttle Housing 1981-1995 Harley Thread-In Single Cable - Black - 1 inch
7 reviews $98.27

Gasbox CV Choke Mount - Tumbled Stainless
24 reviews $18.99

V-Factor Motorcycle Parts 18 Spoke Stainless Steel Brake Rotor - 11.5 inches - Front - Replaces Harley-Davidson OEM #44136-92/44156-00
1 review $65.40

Bar-None Moto BNM Bolt On Sissy Bar For Rogue Fender - 1958-1984 Harley-Davidson Panhead/Shovelhead
4 reviews $293.54

Cycle Standard Heavy Duty Chrome Kicker Lever 1936-1977 Harley-Davidson Big Twin 1957-1976 XL
7 reviews $64.94

Drag Specialties Clutch Cable Harley-Davidson 4 Speed Big Twin 1968-86 - 56" Long
2 reviews $64.84

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Right Hand Outlet
17 reviews $36.41

Cycle Standard 41MM Chrome Fork Tubes 1977-1984 Harley-Davidson FL/FLH - 26-7/8 inch - 6 Over
$191.25

Cycle Standard Clutch Hub Bearing Kit - 1941-84 Harley-Davidson Big Twins
3 reviews $44.00

Cycle Electric Alternator Kit CE-71AR 1980-1988 Harley-Davidson FLH/FLT/FXR With 5 Speed Rubber Mount Motors
$571.48 $611.75

Old-Stf Cycle Shovelhead Rocker Box Split Oil Lines - Stainless Steel
14 reviews $114.29

Prism Supply Co. Jockey Shifter - Long - Harley-Davidson Big Twin
4 reviews $94.99

Cycle Standard 22mm Petcock Round Body Solid Brass Harley-Davidson Style - Left Side Position
14 reviews $70.22

Cycle Standard Replacement Dished Sprocket - Chrome - 51 Tooth - 1973-84 Harley-Davidson Big Twin 1979-81 XL OEM #41470-73
1 review $70.11

Cycle Standard 3 Stud Clutch Hub Assembly - Harley-Davidson Big Twins 1941-1984 - OEM #37550-41B
15 reviews $111.80

Belt Drives LTD. 11mm/1.5 inch Primary Belt Drive - Kick Start - Spline Shaft - 1955-1964 Harley-Davidson Big Twin
1 review $556.65 $585.95

Cycle Standard Front Brake Master Cylinder Assembly - Black - Single Disc 1996-2017 Models (EXCEPT 15-17 Softail, 08-17 Dressers, Trike, 04-17 XL)
$185.44

Cycle Electric Generator DGV-5006 6 Volt for 1936-1964 Harley-Davidsons with 5/16-24 mounting bolts
$555.08 $594.19

Cycle Standard High Performance Clutch Pressure Plate for Harley Shovelhead Replaces OEM #37871-41
16 reviews $42.67

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

Cycle Electric LeBeef CE-540-CP Regulator for use on 65a 12v Harley-Davidson Generators
$275.98 $295.43

Cycle Standard 22mm Petcock Harley-Davidson Style - Black - Left Hand Outlet
24 reviews $36.69

Fast Eddy Co. No. 30 Wheel Bearing Race Remover / Installer
7 reviews $54.95

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.