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

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

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

Lowbrow Customs Complete 21 inch Ribbed Spool Hub Chopper Wheel - 3/4 inch Bearings - Chrome
20 reviews $336.68

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

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

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

Fast Eddy Co. No. 3 Pinion Gear Puller for all 1999 & earlier Harley-Davidson
12 reviews $109.95

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

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

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

Cycle Electric LeBeef Generator DGV-5000-L-CP 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
$628.30 $672.57

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 Motorcycle Neck Cup & Bearing Race Installer Tool
$44.71

Cycle Electric LeBeef Generator DGV-5000-CP 12 Volt - 1965-1984 Harley-Davidsons
$623.66 $667.60

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

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

Lowbrow Customs Belt to Chain Conversion Kit Harley-Davidson Dyna 2000-05 Mag Wheels - Chrome Sprocket
$207.99

Lowbrow Customs 39mm Solid Handlebar Riser Bushings for Harley-Davidson - Aluminum
31 reviews $32.02

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

Cycle Standard Nose Cone Cam Gear Cover - Chrome - 1973-92 Harley-Davidson Big Twin
1 review $175.06

Old-Stf Cycle Shovelhead Rocker Box Split Oil Lines - Brass
29 reviews $91.43

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

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

Cycle Standard 5 Stud Clutch Hub Assembly - Harley-Davidson Big Twins 1941-1984 OEM # 37550-41B
5 reviews $105.64

American Prime Mfg. Transmission Bearing Support
2 reviews $59.95

Cycle Standard 3 Stud Clutch Hub Assembly - Harley-Davidson Big Twins 1941-1984 - OEM # 37550-41B
14 reviews $108.54

Lowbrow Customs Lowbrow Customs Springer Lil Speedies Handlebars - 1 inch - Chrome
$187.19

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

Lowbrow Customs Pursuit Foot Peg Set - Raw Aluminum
14 reviews $100.72

Fast Eddy Co. No. 6 Transmission Socket 1-7/8" for 1936-2005 Harley Big Twins
12 reviews $139.95

Belt Drives LTD. 11mm/1.5 inch Primary Belt Drive - Kick Start - Tapered Shaft - 1936-1954 Harley-Davidson Big Twin
$556.65 $585.95

Lowbrow Customs Pursuit Foot Peg Set - Brass
37 reviews $162.48

Drag Specialties Replacement Starter - 1990-2006 Harley-Davidson Big Twin/Twin Cam - Black
1 review $368.11

Cycle Electric Generator DGV-5006H 6 Volt for 1936-1957 Harley-Davidsons w/Heli Coils
1 review $551.51 $590.37

Cycle Electric Alternator Kit 32 amp CE-32AL - 1988-1999 Harley-Davidson Softail
$363.15 $388.74

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

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

Cycle Electric Rectifying Regulator CE-606- 2006-2008 Harley-Davidson FLH FLT
32 reviews $210.84 $225.70

Mooneyes MOON Spun Aluminum Air Cleaner for CV or S&S Super E/G Carburetors
13 reviews $98.00

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

Drag Specialties Friction Clutch Plate Kit (5-Pack) for 1968-1984 Harley Shovelhead
13 reviews $78.23

Lowbrow Customs Louvered Air Cleaner for Harley CV / EFI 1991-2020 - Chrome
77 reviews $72.79

Lowbrow Customs 39mm Tapered Fork Lowers - Aluminum
$334.04

Mullins Chain Drive 35mm Super Narrow Tree Set
3 reviews $500.00

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons - Includes Module and DC-6-5 Twin Fire II Mini Coil
1 review $499.99

Prism Supply Co. Sling Shot Hydraulic Brake Pedal Kit - Harley-Davidson Cone Engine - Stainless Steel
$249.99

Cycle Standard 41MM Chrome Fork Tubes 1977-1984 Harley-Davidson FL/FLH - 28-7/8 inch - 8 Over
$206.69

Gasbox Strong Arm Top Motor Mount With Coil Mount 1948-84 Harley Big Twins
5 reviews $74.95

Cycle Standard Nose Cone Cam Gear Cover - Chrome - 1993-99 Harley-Davidson Big Twin
$141.56

Lowbrow Customs Complete 21 inch Ribbed Spool Hub Chopper Wheel - 3/4 inch Bearings - Black
9 reviews $341.10

Cycle Standard Exhaust Flange Kit H-D 1984-13 Big Twins and 1986-13 XL OEM 65328-83 and 65325-83
18 reviews $31.39

Mooneyes 60 psi Oil Pressure Gauge
33 reviews $49.00

Andrews EV27 Camshaft - 1984-1999 Harley-Davidson Big Twin
$226.76 $251.95

Lowbrow Customs Rigid Shock Struts for Harley-Davidson Motorcycles
8 reviews $129.99

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

Cycle Standard 41MM Chrome Fork Tubes 1984-1999 Harley-Davidson FXWG/D FXST - 28-1/4 inch - 4 Over
$200.94

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

Cycle Standard Chrome Kickstand Kit - 1966 - 1986 Harley-Davidson FL FX
12 reviews $107.62

Mooneyes Finned Points Cover for Harley-Davidson Big Twins
30 reviews $67.67

Lowbrow Customs Mounting Kit for WX Gas Tanks - 1985-1999 Harley-Davidson Softails
$62.39

S&S Cycle Super E Carburetor Kit 1984-91 Harley-Davidson Big Twin
1 review $809.96 $899.95

LCFabrications Brake Switch Pod Delete - Black - for H-D
27 reviews $29.95

Lowbrow Customs Belt to Chain Conversion Kit Harley-Davidson Dyna 1994-99 - Black Sprocket
9 reviews $199.99

Led Sled Customs Smoothie Oil Tank for Harley-Davidson Choppers
5 reviews $199.95

Cycle Standard 1936-1986 Harley-Davidson Big Twin 4 Speed Kickstarter Rebuild Kit
1 review $115.29

Cycle Standard 3 position Ignition Key Switch Replaces Harley-Davidson OEM #71425-77 - Chrome Body / Chrome Bezel
16 reviews $36.00

Drag Specialties Complete Advance Unit Assembly 1970-1999 Harley Davidson Big Twin 1971-2003 XL Points Ignition (Except Single Fire Ignition)
3 reviews $64.43

Fast Eddy Co. No. 12 Float Bowl Drain Valve for S&S Super E / G / B Carburetors
23 reviews $44.95

Mid-USA 16 x 3 Black Complete Front Single Flange Wheel Harley-Davidson FLST 1984-1999
$188.45

Gasbox Exhaust Pipe Set 1966-1969 Harley-Davidson Generator Shovelhead FL FLH 74 ci - Bare Steel
$249.99

Gasbox Strong Arm Top Motor Mount with Coil Mount - 1984-1999 Harley-Davidson Big Twin Evolution
$74.95

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.