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

Cannonball Stealthstarter Electric Starter Kit Swingarm Frame 4 Speed 1958-1985 Harley-Davidson Big Twins
$3,997.74

Cannonball Stealthstarter Electric Starter Kit Rigid Frame 4 Speed Harley-Davidson Big Twins
2 reviews $3,997.74

S&S Cycle SH93 S&S Shovelhead Engine - Complete Harley Big Twin Motor
$9,399.95 $9,999.95

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons
5 reviews $256.66 $264.43

Mid-USA 16 x 3.00 Chrome Complete Rear Wheel fits all Harley-Davidson 1979-1999
22 reviews $206.50

Cycle Standard 39MM Chrome Fork Tubes - 31 inch - 6 Over
14 reviews $223.69

Lowbrow Customs Complete 21 inch Ribbed Spool Hub Chopper Wheel - 3/4 inch Bearings - Chrome
20 reviews $299.99

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1965-1978 Harley-Davidson Big Twins
$596.55 $627.95

Lowbrow Customs Rogue Fender - 1958-84 Harley-Davidson Panhead Shovelhead
118 reviews $299.99

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

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

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1-Inch Diameter - Chrome
23 reviews $119.99

Cycle Electric DGV-5000 12V Generator for Harley-Davidson 1965-1984
52 reviews $509.63 $553.95

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

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

Gasbox Full Rigid Frame 1936-1999 Harley-Davidson Big Twin 4 Speed - Frisco Tank Mounts - Horseshoe Oil Tank
1 review $1,799.00

Mid-USA 16 x 3.00 Chrome Complete Front / Rear Wheel fits Harley-Davidson Big Twins 1973-1984
13 reviews $206.50

Dynatek Performance Electronics Dyna S Ignition Complete Kit - Dual Fire for Harley Davidson
17 reviews $204.43

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

Mid-USA Forward Controls 1936-1999 Harley-Davidson Big Twin - 5/8" Bore - Black Billet
$249.99

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

Cycle Standard 39MM Chrome Fork Tubes - 29 inch - 4 Over
4 reviews $218.80

Cycle Standard Isolator Motor Mount - Front - 1991-2017 Harley-Davidson Dyna
3 reviews $99.11 $123.89

Cycle Electric Generator DGV-5000-LH 12 Volt Low Voltage - 1936-1964 Harley-Davidsons w/Heli Coils
$528.83 $574.82

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

Cycle Electric Generator DGV-5000L 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
41 reviews $514.21 $558.92

Mullins Chain Drive 39mm Super Narrow Tree Set
17 reviews $500.00

Lowbrow Customs Big Twin Harley-Davidson Engine Stand (1936-1999) - Fits Knucklehead, Panhead, Shovelhead, Evo Motors
49 reviews $59.99

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 - Black
9 reviews $269.99 $299.99

S&S Cycle Super E Carburetor Kit 1993-99 Harley-Davidson Big Twin
$719.96 $799.95

Lowbrow Customs Narrow Rabbit Ears Handlebars - 1 inch - Chrome
40 reviews $119.99

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

Cycle Standard Chrome Flexible Exhaust Cover for vintage Harley & Universal
17 reviews $46.57

Cycle Electric Generator DGV-5000-L-BLK 12 Volt - Low Voltage - 1965-84 Harley-Davidson - Blacked Out
$505.97 $549.97

Drag Specialties 5 ohm Dual Fire Coil - for Points Ignition
15 reviews $76.45

Mid-USA 16" x 3.00" Black Wheel for 1973-1984 Harley Big Twin - Front or Rear - Dual Flange
5 reviews $247.55

Lowbrow Customs Louvered Air Cleaner for Harley CV / EFI 1991-2020 - Chrome
77 reviews $69.99

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

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 $170.94

Cycle Electric LeBeef Generator DGV-5000-LH-CP 12 Volt Low Voltage - 1936-1964 Harley-Davidsons w/Heli Coils
$606.30 $659.02

Lowbrow Customs Springer Riser Adapter Top Clamp
3 reviews $179.99

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

Mid-USA Forward Controls 1936-1999 Harley-Davidson Big Twin - 5/8" Bore - Polished Billet
$249.99

Cycle Standard Bayonet / Cam Harley Style Vented 2" Gas Cap - Chrome
52 reviews $16.76

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

V-Twin Manufacturing Offset Spring Fork Assembly 1997-2005 Harley-Davidson FLSTS - Chrome
$1,664.11 $1,808.82

Airspeed Cycles T-Bar Handlebars - 12 inch Rise - 1 inch - Stainless Steel
$235.00

V-Twin Manufacturing Chrome Neck Cup Hidden / Internal Fork Stop Kit 1949-1987 Harley-Davidson Big Twins
12 reviews $81.86

Bates BattBoy Battery Box for Modern Gel or Li-Ion Batteries fits OEM-style Harley-Davidson Horseshoe Oil Tanks
26 reviews $135.65

Cycle Standard Wagner Lockheed Type Rear Disc Brake Master Cylinder - Chrome - 1973-E1979 Harley-Davidson FL/FX
$89.24

V-Factor Motorcycle Parts Lever Action Starter Solenoid 1965-1986 Harley-Davidson Big Twin 4 Speed 1984-1988 Softail - Black
$119.95

Cycle Electric CE-84T-99 Stator Rotor and Regulator Kit for 1999 - 2003 Harley-Davidson FLH and FLT Models
18 reviews $514.12 $558.83

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

Cycle Standard Fat Bob Style Gas Tanks - 1948-1984 Harley-Davidson FX/FL - 3.5 Gallon
$249.95

Cannonball Heavy Duty Kickstarter Kit fits 1985-1998 Harley-Davidson 5-Speed Big Twin
$1,684.24

Dynatek Performance Electronics 3 Ohm Dual Output HD - For Use With Dyna Electronic Ignitions
$112.21

American Prime Mfg. Comp Master Ignition Advance Unit - 1970-Up Harley-Davidson Replaces OEM# 3251770T
4 reviews $76.40

Cycle Electric Stator CE-8012 for 2006 - 2016 Harley-Davidson FLH and FLT Models
23 reviews $160.44 $174.39

Lowbrow Customs Lowbrow Customs Springer Lil Speedies Handlebars - 1 inch - Chrome
$179.99

Cycle Electric Rectifying Regulator CE-608 - 2009-2013 Harley-Davidson FLH FLT Models with Low Mount Oil Cooler
17 reviews $201.77 $219.31

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

V-Twin Manufacturing 16 x 3 Front/Rear Black Star Hub Wheel 1941-1966 Harley-Davidson FL 1937-1948 UL 1936-1940 EL
$466.59 $507.16

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
25 reviews $45.00

V-Twin Manufacturing 21 x 2.15 Front Star Hub Chrome Wheel 1937-1948 Harley-Davidson UL 1936-1940 EL 1941-1966 FL
$463.50 $503.80

Lowbrow Customs 39mm Solid Riser Bushings for Harley-Davidson - Aluminum
31 reviews $30.79

Drag Specialties Friction Clutch Plate Kit (5-Pack) for 1968-1984 Harley Shovelhead
13 reviews $77.47

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 $456.65

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.