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 Rigid Frame 4 Speed Harley-Davidson Big Twins
2 reviews $3,354.48

Cannonball Stealthstarter Electric Starter Kit Swingarm Frame 4 Speed 1958-1985 Harley-Davidson Big Twins
$3,354.48

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

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

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

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

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1965-1978 Harley-Davidson Big Twins
$556.65 $585.95

Lowbrow Customs T-Bars Handlebars - 10-Inch Rise - 1-Inch Diameter - Chrome Finish for Harley-Davidson
23 reviews $119.99

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

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

Til Death Cycles 39mm Harley-Davidson Front End Extended Damper Tube Kit
19 reviews $99.95

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

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1979-E1984 Harley-Davidson Big Twins
$556.65 $585.95

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

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

V-Twin Manufacturing Inline Spring Fork Assembly 1988-2006 Harley-Davidson FXSTS - Black
$1,603.80 $1,782.00

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

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

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

Cycle Electric Alternator Kit 32 amp CE-32A - Harley-Davidson Evo Big Twins
3 reviews $354.35 $385.16

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

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

Lowbrow Customs Complete 21 inch Ribbed Spool Hub Chopper Wheel - 3/4 inch Bearings - Black
9 reviews $269.99 $299.99

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

Lowbrow Customs Big Twin Harley-Davidson Engine Stand (1936-1999) - Fits Knucklehead, Panhead, Shovelhead, Evo Motors
49 reviews $74.99

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

Bates BattBoy Battery Box for Modern Gel or Li-Ion Batteries fits OEM-style Harley-Davidson Horseshoe Oil Tanks
26 reviews $129.37

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

Lowbrow Customs Premium Stainless Steel Intake Clamp Kit 1955-1977 Harley-Davidson FL/FX/XL
$27.99

S&S Cycle Super E Carburetor Assembly - Black #110-0133
$494.96 $549.95

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
25 reviews $45.00

Lowbrow Customs Belt to Chain Conversion Kit Harley-Davidson Dyna 2000-05 Mag Wheels - Black Sprocket
3 reviews $229.49 $269.99

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

Cycle Electric Regulator CE-540 for use on 65a 12v Harley-Davidson Generators
25 reviews $178.13 $193.62

Cycle Electric LeBeef Generator DGV-5000-CP 12 Volt - 1965-1984 Harley-Davidsons
$587.09 $638.14

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

Lowbrow Customs Belt to Chain Conversion Kit Harley-Davidson Dyna 1994-99 - Black Sprocket
9 reviews $212.49 $249.99

FNA Custom Cycle Twisty Transmission Plate - Harley-Davidson Big Twin 4 Speeds
$240.00

Lowbrow Customs Dimpled Steel Motorcycle Oil Tank for H-D Sportster Big Twin and Universal Choppers
28 reviews $209.99

Cannonball Heavy Duty Kickstarter Kit fits 1985-1998 Harley-Davidson 5-Speed Big Twin
$1,641.26

V-Twin Manufacturing Inline Spring Fork Assembly 1988-2006 Harley-Davidson FXSTS - Chrome
$1,627.94 $1,808.82

V-Twin Manufacturing Offset Spring Fork Assembly 1997-2005 Harley-Davidson FLSTS - Black
$1,603.82 $1,782.02

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

Cycle Electric Generator DGV-2569 model 65A 12v for Harley-Davidson 1936 - 1984
12 reviews $383.52 $416.87

Mooneyes 60 psi Oil Pressure Gauge
33 reviews $39.99

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

Lowbrow Customs Rigid Shock Struts for Harley-Davidson Motorcycles
8 reviews $124.99

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

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

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

Bar-None Moto BNM Bolt On Sissy Bar For Rogue Fender - 1958-1984 Harley-Davidson Panhead/Shovelhead
4 reviews $269.99

V-Twin Manufacturing MCM Slash Cut Drag Pipes 1971-1984 Harley-Davidson Shovelhead - Chrome
1 review $149.72 $170.14

Cycle Standard 39MM Chrome Fork Tubes - 25 inch - Stock Length
5 reviews $191.86

V-Twin Manufacturing Chrome Fork Neck Cup Kit with Fork Stops for Harley-Davidson Big Twins
9 reviews $73.22 $77.07

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

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

Morris Magneto MM2 Magneto for 1971-1980 Harley-Davidson XL - Brushed Finish
$1,295.00

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

Drag Specialties 5 ohm Dual Fire Coil - for Points Ignition
15 reviews $67.95

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

Lowbrow Customs Springer Riser Adapter Top Clamp
3 reviews $179.99

Lowbrow Customs Throttle Housing 1996 & up Harley Push-In Dual Cable - Black - 1 inch
16 reviews $89.99

Mid-USA Forward Controls 1936-1999 Harley-Davidson Big Twin - 3/4" Bore - Polished Billet
$249.99

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

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

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

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

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

Cycle Electric LeBeef Generator DGV-5000-L-CP 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
$591.66 $643.11

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

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.