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

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Cannonball Stealthstarter Electric Starter Kit Rigid Frame 3 & 4 Speed Harley-Davidson Big Twins
3 reviews $3,894.96

Belt Drives LTD. 2" SS Belt Drive - Without Cover - 1990-2006 Harley-Davidson FXST/FLST
$2,790.51 $2,937.38

Lowbrow Customs 21" Front Ribbed Spool Wheel - Chrome
24 reviews $374.52

Mid-USA 6 Speed Transmission - Cast Finish - 1990-1999 Harley-Davidson Softail
$1,089.00 $1,414.70

Lowbrow Customs Rogue Fender - 1958-84 Harley-Davidson Panhead Shovelhead
130 reviews $337.68

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

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

Mid-USA 6 Speed Transmission - Black Finish - 1990-1999 Harley-Davidson Softail
$1,289.00 $1,443.75

Cycle Standard 39MM Chrome Fork Tubes - 31 inch - 6 Over
22 reviews $278.39

Gasbox Bolt-On Oil Tank for Rigid Harley-Davidson Big Twin Frames with Electric Start
3 reviews $299.99

Gasbox Reno Full Rigid Chopper Frame 1936-1999 Harley-Davidson Big Twin 5 Speed - 2" Up - Frisco Tank Mounts
1 review $1,499.00

Gasbox Reno Full Rigid Chopper Frame 1936-1999 Harley-Davidson Big Twin 4 Speed - 2" Up - Frisco Tank Mounts
$1,499.00

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1-Inch Diameter - Chrome
30 reviews $151.71

Cannonball Stealthstarter Electric Starter Kit Swingarm Frame 4 Speed 1958-1985 Harley-Davidson Big Twins
1 review $4,260.63

Cycle Standard 39MM Chrome Fork Tubes - 29 inch - 4 Over
6 reviews $272.24

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

Jims USA 6 Speed Overdrive Transmission - Plain Case - 1991-1999 Harley-Davidson Softail
$3,964.00

Mid-USA 6 Speed Transmission - Polished Finish - 1990-1999 Harley-Davidson Softail
2 reviews $1,289.00 $1,451.70

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

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

Gasbox Reno Full Rigid Chopper Frame 1936-1999 Harley-Davidson Big Twin 5 Speed - 2" Up - Frisco Tank Mounts - Horseshoe Oil Tank
$1,799.00

Gasbox Reno Full Rigid Chopper Frame 1936-1999 Harley-Davidson Big Twin 4 Speed - 2" 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

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 Standard 39MM Chrome Fork Tubes - 35 inch - 10 Over
1 review $338.79

Cycle Electric CE-84T-99 Stator Rotor and Regulator Kit for 1999 - 2003 Harley-Davidson FLH and FLT Models
21 reviews $545.16 $583.57

Lowbrow Customs Springer Top Clamp for Standard 3.5" Handlebar Risers
3 reviews $214.60

Belt Drives LTD. 2" Open Belt Drive Kit - Polished - 1990-2006 Harley-Davidson FXST/FLST
2 reviews $2,958.01 $3,113.69

Cycle Electric Alternator Kit 32 amp CE-32AR for Harley-Davidson Evo Big Twins
4 reviews $367.45 $393.34

Belt Drives LTD. 8mm/1.5 inch Primary Belt Drive - Kick Start - 1965-1978 Harley-Davidson Big Twins
$726.39 $764.62

Lowbrow Customs T-Bars Handlebars - 12 Inch Rise - 1 inch Diameter - Chrome
5 reviews $155.67

Lowbrow Customs 39mm Tapered Fork Lowers - Aluminum
2 reviews $371.58

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

Cycle Standard 39MM Chrome Fork Tubes - 27 inch - 2 Over
2 reviews $226.35

Cycle Electric Generator DGV-5000L 12 Volt - Low Voltage - 1965-1984 Harley-Davidson
45 reviews $543.94 $582.26

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

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

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

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

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

S&S Cycle Super E Carburetor Kit 1979-84 Harley-Davidson Shovelhead
2 reviews $799.95

Gasbox High Low Shotgun Exhaust Pipe Set for Harley-Davidson Evolution Big Twin Engines in Rigid Frames
$299.95

Gasbox Upswept Exhaust Pipe Set 1948-1957 Harley-Davidson Rigid Panhead - Chrome
5 reviews $214.95

Cycle Electric Stator CE-8012 for 2006 - 2016 Harley-Davidson FLH and FLT Models
41 reviews $165.80 $177.48

Lowbrow Customs Narrow Rabbit Ears Handlebars - 1 inch - Chrome
47 reviews From $143.17

Lowbrow Customs 39mm Narrow Triple Trees Kit
3 reviews $449.99

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

Cycle Electric CE-8010-08 Stator Replacement for 2008-2017 Harley Dyna & Softail OEM #30017-08
23 reviews $163.88 $175.43

Cycle Standard Bayonet / Cam Harley Style Vented 2" Gas Cap - Chrome
54 reviews $23.81

Cycle Standard 39MM Chrome Fork Tubes - 33 inch - 8 Over
2 reviews $314.70

Unity Manufacturing Torque Wrench Dogbones Adaptor Set
39 reviews $50.00

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

Lowbrow Customs Belt To Chain Conversion Kit 1995-1999 Harley-Davidson Softail - Chrome Sprocket
3 reviews $172.22

Lowbrow Customs Rear Suspension Delete Kit 1984-1999 Harley-Davidson Softails
2 reviews $210.23

Airspeed Cycles Narrow Bottom Ape Hanger Handlebars - 11 inch Rise - 1 inch - Stainless Steel
$175.00

Cannonball Lion Battery Box for Li-Ion Batteries 1936-1964 Harley-Davidson OHV Big Twin 1937-1948 SV Big Twin
$463.52

Lowbrow Customs Belt To Chain Conversion Kit 1984-1994 Harley-Davidson Softail - Chrome Sprocket
2 reviews $191.76

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

Lowbrow Customs 39mm Solid Handlebar Riser Bushings for Harley-Davidson - Aluminum
36 reviews $39.20

Cycle Standard 41MM Chrome Fork Tubes 1984-1999 Harley-Davidson FXWG/D FXST - 30-1/4 inch - 6 Over
$231.53

Belt Drives LTD. BDL 8mm 1.5" Primary Belt Drive – Electric Start – 1965-1978 Harley Shovelhead
$845.50 $890.00

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

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for Harley-Davidsons
9 reviews $330.71

Cycle Standard Drilled Stainless Steel Brake Rotor - 11.5 inches - Replaces Harley-Davidson OEM #41791-79A
2 reviews $110.04

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

Cycle Standard 8-1/2 inch Pullback Handlebar Riser Set - Chrome
2 reviews $142.05

Belt Drives LTD. 11mm/1.5 inch Primary Belt Drive - Kick Start - Spline Shaft - 1965-E1984 Harley-Davidson Big Twin
$784.84 $826.15

Prism Supply Co. Quick Stick Start Lever 2.0 1991-Up Harley-Davidson Sportster 1989-Up Big Twin - Matte Aluminum
6 reviews $119.99

Lowbrow Customs Big Twin Harley-Davidson Engine Stand (1936-1999) - Fits Knucklehead, Panhead, Shovelhead, Evo Motors
54 reviews $74.31

Cycle Electric Stator CE-8999 for 1989-1999 Harley-Davidson Evo Big Twins with 32 amp Alternator
27 reviews $109.29 $116.99

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.

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Harley-Davidson Big Twin Parts FAQ

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