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

Drag Specialties High Performance Starter Solenoid 1965-1984 Harley-Davidson Big Twin 4 Speed 1967-1980 XL 1984-1988FXST/FLST 1985-1986 FXWG/FXSB
$75.87

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

V-Factor Motorcycle Parts MCM Slash Cut Drag Pipes 1986-2006 Harley-Davidson Softail - Chrome
$129.99

Cycle Standard Clutch Shell With Starter Ring 1970-E1984 Harley-Davidson Big Twins - OEM # 37702-70A
$259.14

Cycle Standard 35MM Chrome Fork Tubes - 25-1/4 inch - 2 Over
2 reviews $173.31

James Gaskets Top End Gasket Kit 1966-1984 Harley-Davidson Shovelhead
$71.99

Lowbrow Customs Louvered Air Cleaner for S&S Super E / G Carburetors - Chrome
35 reviews $72.79

Burly Brand Ape Hanger Handlebars - 1 inch - 12 inch Rise - Chrome

2 $165.56 $183.95

Dynatek Performance Electronics 5 ohm Dual Fire Coil - for Points Ignition
2 reviews $122.21

Cycle Craft Carburetor Rebuild Kit 1988-2006 Harley-Davidson CV Carbs
9 reviews $25.70

Fork Co., Ltd British Wide and Narrow Handlebars - Stainless Steel
$243.89

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1 inch Diameter - Black
22 reviews From $132.15

Cycle Standard Screw-In Harley Stock Style Vented Gas Cap - 1996 & up - Black
62 reviews $18.74

Old-Stf Cycle Shovelhead Rocker Box Split Oil Lines - Stainless & Black
$99.95

Drag Specialties 6-1/2 inch Forged Aluminum Handlebar Risers - Chrome
$71.02

Bates BattBoy 65 Battery Box 1965-84 Harley-Davidson FL FLH and 1967-78 XL
7 reviews $119.81

Drag Specialties Vintage Style Half Moon Floorboards - Chrome
2 reviews $160.63

Lowbrow Customs 39mm Narrow Glide Fork Brace - Standard Width
$145.59

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

Performance Machine 1 inch Contour Billet Brake Master Cylinder 9/16" Bore - Chrome
$461.95

Cycle Electric Rectifying Regulator CE-203 - 1976-1980 Harley-Davidson Big Twins
11 reviews $161.34 $172.71

Cycle Standard 35MM Chrome Fork Tubes - 23-1/4 inch - Stock Length
2 reviews $166.66

S&S Cycle Replacement 4 Speed Kicker Cover Kit - Aluminum
2 reviews $230.36 $255.95

Cycle Standard Polished Clutch Lever Assembly - 1968-1971 FL/FX 1971-1972 XL - OEM# 38608-68
4 reviews $24.51

V-Factor Motorcycle Parts 18 Spoke Stainless Steel Brake Rotor - 11.5 inches - Rear - Replaces Harley-Davidson OEM# 41789-92/41797-00
$65.40

Cycle Standard Screw-In Harley Stock Style Vented Gas Cap - 1996 & up - Chrome
37 reviews $24.20

Cycle Standard Ignition Advance Unit WIth Bolt 1970-Up Harley-Davidson OEM# 3251770T
$34.13

Gasbox Front Exhaust Pipe 1966-1969 Harley-Davidson Shovelhead - Chrome - OEM# 65443-66
2 reviews $75.00

Cycle Standard 10-stud Clutch Hub Puller
22 reviews $45.39

Mooneyes MOON No Name Air Cleaner for CV or S&S Super E/G Carburetors
3 reviews $112.00

Gasbox Big Twin Voltage Regulator Mount
24 reviews $21.95

Cycle Standard Mega Nut Sprocket and Pulley Lock Nut for 1993+ Harley Sportster, Big Twin, and Twin Cam
17 reviews $65.56

Gasbox Evo Sportster CV Carburetor Support Bracket - 1991-2006 Harley-Davidson Sportsters - Tumbled Aluminum
23 reviews $34.95

Hugh's Handbuilt HHB Harley Davidson Sprocket Lock System - Black Anodized
$69.89

Cycle Electric Stator CE-3845-02 for 2002 - 2005 Harley-Davidson FLH and FLT Models
10 reviews $139.72 $149.56

Gasbox CV Choke Mount - Tumbled Stainless
22 reviews $18.99

American Prime Mfg. Comp Master Ignition Advance Unit - 1970-Up Harley-Davidson Replaces OEM# 3251770T
4 reviews $88.21

Cycle Standard Drilled Stainless Steel Brake Rotor - 11.5 inches - Replaces Harley-Davidson OEM# 44156-00
2 reviews $90.69

Colony #3081-7 Seat Spring Upper and Lower Set 1936-1957 Harley-Davidson Rigid Big Twin
3 reviews $82.50

Cycle Standard Speedometer Mounting Gasket for Harley-Davidson 1989 - 1991 Sportster XL Models and 1987 - 1994 FXR OEM #67104-83
27 reviews $14.82

Progressive Suspension 412 Series 13.5" Shocks Chrome With Full Covers 1958-1972 Harley-Davidson FL/FLH
$454.95

Cycle Standard Universal Fork Boot Gaiter Set for 41mm Front Forks
10 reviews $41.38

Colony #2939-26 Complete Springer Rocker Rebuild Kit 1931-1948 Harley-Davidson Big Twin - Parkerized
2 reviews $204.20

Cycle Standard Primary Chain Adjuster Kit - 1965-2000 Harley-Davidson Big Twin
$70.30

S&S Cycle Quickee Adjustable Pushrod Set - 1984-1999 Harley-Davidson Big Twin
2 reviews $202.46 $224.95

Cycle Standard High Performance Clutch Pressure Plate for Harley Shovelhead Replaces OEM 37871-41
15 reviews $40.64

Hawg Supply Bolt-On Mid Peg Mounts 1970-1999 Harley-Davidson Big Twins
$99.99

Cycle Standard Heavy Duty Clutch Release Pushrod Kit OEM # 37305-70 for 1966-84 Harley-Davidson Big Twins
14 reviews $54.45

Lowbrow Customs Pursuit Shifter Peg for Harleys - Solid Brass
40 reviews $51.01

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

Cycle Electric Generator DGV-2578-H 6 Volt for 1936-1957 Harley-Davidsons w/Heli Coils
$400.50 $428.72

Gasbox S&S Carburetor Support Bracket - 1985-1999 Harley-Davidson Evolution Big Twin
23 reviews $27.99

Fast Eddy Co. No. 20 Pinion Gear Locking Tool 1954-1999 Harley Big Twins
2 reviews $99.95

Cycle Standard Drilled Stainless Steel Brake Rotor - 11.5 inches - Replaces Harley-Davidson OEM# 44136-84A, 44136-92
$90.69

LePera Bare Bones Solo Seat - Pleated - fits 1984-1999 Harley-Davidson Softail
$387.00

Cycle Standard Front Fender - Chrome - Harley-Davidson 1973-up XL FX FXR 35mm 39mm Narrow Glide Front Forks - OEM # 59031-83
16 reviews $101.62

Lowbrow Customs Bolt On 3/4 inch Ignition Key Switch Bracket for Harley-Davidson Four Speed Transmissions - Tumbled Stainless
13 reviews $21.79

Fast Eddy Co. No. 31 Neck Bearing Race Remover / Installer
4 reviews $54.95

Cycle Standard 39mm Fork Boot Gaiter Set for Harley Sportster's Front Forks
28 reviews $41.63

Lowbrow Customs Spare Parts Book for 1958-1968 Harley-Davidson Panhead Shovelhead
14 reviews $33.62

Cycle Standard Black 12V Square Coil 1948-60 Harley-Davidson Big Twins
$105.70

Cycle Standard Ignition Advance Unit - Stainless Steel - 1970-Up Harley-Davidson OEM# 3251770T
$50.85

Cycle Standard Dragton II Air Cleaner - Chrome - Fits Bendix / Zenith, Keihin (except CV) Carbs
13 reviews $64.80

Gasbox Strong Arm Top Engine Mount For Early Big Twin Engines In Gasbox Frames
$74.95

Lowbrow Customs Banded Screw-In Gas Cap for Harley-Davidson 1996 & later - Brass
35 reviews $79.27

Lowbrow Customs Harley-Davidson 45 Flathead Motor Engine Stand
7 reviews $77.99

Drag Specialties Hydraulic Brake Light Switch 1984-99 Harley-Davidson FLST/FX/FXST/FXR 79-85 XL 91-98 Dyna 71-84 FX 80-98 FLT 82-83 FXR
6 reviews $20.75

Trader Cody's Choppers Rotary Top Shift Lever 1979-1986 Harley-Davidson Transmissions 4 Speeds - Stainless Steel
$30.00

Lowbrow Customs Throttle Housing 1996 & up Harley Push-In Dual Cable - Black - 1 inch
16 reviews $93.59

Burly Brand Slammer Suspension Kit - 2006- 2017 Harley-Davidson Dyna FXD - Black
$387.86 $430.95

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.