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

Colony #2693-1 Spoke Nipple Wrench Harley-Davidson Big Twins/45s/Servi-car
$55.00

Colony #3252-6 Locking Exhaust Pipe Bolt Kit 1966-1984 Harley-Davidson Shovelhead - Chrome Plated
7 reviews $27.50

Colony #2916-2 Starter Shaft Nut and Spacer Kit 1965-1969 Harley-Davidson FL
1 review $27.50

Prism Supply Co. Blade Style Push-in Oil Plug - Tumbled
$54.99

Colony #7824-12 Pushrod Covers 1940-1947 Harley-Davidson Knuckleheads - Chrome Plated
$54.67

Lowbrow Customs Air Cleaner Backplate Gasket for CV Carburetor
24 reviews $2.02

Colony #8728-12 Rubberized Cork Pushrod Cover Seals Pre-1979 Harley-Davidson Panhead/Shovelhead
18 reviews $9.08

Colony #3168-16 Footboard Mounting Kit 1965-69 Harley Davidson Big Twins — Colony #3168-16 Footboard Mounting Kit 1965-1969 Harley-Davidson Big Twins - Parkerized
1 review $54.45

Colony #2711-2 Brake Shaft Cross Over Bushing Kit 1937-1957 Harley-Davidson Big Twins
4 reviews $18.15

Samwel Supplies Reproduction Bearing Adjuster Nuts for Springer Forks - Parkerized
8 reviews $54.19

Colony #2082-5 Front Brake Shoe Pivot Stud Kit 1949-1971 Harley-Davidson FLH 1958-1972 Servi-car - CAD Plated
1 review $27.07

Cycle Standard Mini 1:1 ratio Mechanical Speedometer - 2.4 inch
4 reviews $53.99

Colony #3639-2 Intake Manifold Rubber Seals 1978-1984 Harley-Davidson Shovelhead & Sportster
$7.70

Colony #7807-3 Gas Tank Fitting Kit 1950-1965 Harley-Davidson Big Twins - Chrome Plated
1 review $23.91

Cycle Standard Laydown License Plate Mount - Black - Bolt-on Fitment for 1955 - 2018 Harley-Davidson
22 reviews $37.76

Colony #8457-20 Heat Treated Cap Style Head Bolt Kit 1948-1983 Harley-Davidson Panhead/ Shovelhead - Chrome Plated
$66.63

Cycle Standard Replacement Dished Sprocket - Black - 51 Tooth - 1973-1985 Harley-Davidson Big Twin 1979-81 XL OEM# 41470-73
$66.56

James Gaskets Exhaust Port Gaskets - STD Heads for Harley-Davidson Shovelheads
$13.11

Cometic Gasket Inc. Cam Change Gasket Kit - 1993-99 Harley-Davidson Big Twin
$26.20

Cometic Gasket Inc. Cam Change Gasket Kit - 1970-92 Harley-Davidson Big Twin
$26.20

Colony #3038-18 Gas Tank Mounting Kit 1937-1975 Harley-Davidson Big Twins 1971-1972 FX - Parkerized
1 review $17.42

Cycle Standard Headlight Visor - 7" Headlight - Chrome - Replaces OEM# 69734-05
$26.55 $35.40

Colony #8449-22 Rocker Box and Rocker Shaft Cap Nut Kit 1966-1983 Harley-Davidson Shovelhead - Chrome Plated
1 review $52.87

Cycle Standard Heel-Toe Shift Lever - 1965-1984 Harley-Davidson FL/FLH (With Splines) - Chrome - OEM# 34692-74TA
$52.84

Colony #9618-18 Jiffy Stand & Foot Clutch Lever Bracket Mounting Kit 1936-1978 Harley-Davidson Big Twin - CAD Plated
1 review $26.40

Colony #9893-18 Gas Tank Mounting Kit 1937-1975 Harley-Davidson Big Twin 1972-1972 FX - Parkerized
3 reviews $17.42

Colony #3045-14 Inner Primary Chain Guard Kit 1936-1954 Harley-Davidson Big Twins - Parkerized
1 review $26.08

Colony #2024-4 Headbolt Covers L1985-Up Harley-Davidson FL/FX/XL - Chrome Plated
1 review $52.14

Colony #2232-4 Headbolt Smooth Covers 1985-Up Harley-Davidson FL/FX/XL - Chrome Plated
1 review $52.14

#2373-1 Fork Tube Bolt OEM 45756-59 Harley Superglide 71-72 K XL 52-72 — Colony #2373-1 Fork Tube Cap/Bolt 1971-1972 Harley-Davidson Superglide 1952-1972 K/XL - Chrome Plated
$26.07

Colony #9866-18 Transmission Mounting Kit 1986-Up Harley-Davidson FXST - Chrome Plated
$26.07

Cycle Standard Oil Filter OEM# 63840-53 for Harley-Davidson Big Twins with Filter In Tank
9 reviews $7.44

Colony #3744-1 Stem Crown Nut Kit 1936-1948 Harley-Davidson Big Twin Springer
$51.70

Colony #3561-1 Stem Crown Nut 1939-1948 Harley-Davidson Big Twin Springer - Parkerized
$51.70

Colony #3014-34 Stock Fastener Motor Case Kit 1948-1964 Harley-Davidson Panhead - Parkerized
2 reviews $51.70

Colony #7137-22 High Crown Acorn Rocker Box Bolt Kit - 1966-1984 Harley-Davidson Shovelhead - Chrome Plated
4 reviews $51.43

#3107-16 Front Shock Absorber Upper Mount Kit Harley Springer 1946-57 — Colony #3107-16 Front Shock Absorber Upper Mount Kit 1946-1957 Harley-Davidson Springers - Parkerized
$51.15

Colony #9864-6 Grease Fitting Zerk Type 1936-1984 Harley-Davidson - CAD Plated
3 reviews $12.74

Colony #2867-1 Rear Axle Spacer 1936-1957 Harley-Davidson Big Twins - Chrome Plated
$25.30

Colony #2695-5 Linkert Low Speed Needle Valve 3-1/2 inch 1948-1965 Harley-Davidson Type 1 Heads
$25.30

Colony #9724-30 Primary Cover Screw Kit 1936-1964 Harley-Davidson Big Twin - Parkerized
2 reviews $25.00

Colony #8156-30 Primary Cover Screw Kit 1936-1964 Harley-Davidson Big Twins - CAD Plated
$25.00

Colony #8860-8 Cylinder Base Stud Spacer 1978-1984 Harley-Davidson Shovelhead OEM# 16836-78 - Chrome Plated
1 review $24.98

Clymer Manuals 1948-1965 Harley Davidson Panhead Manual
$49.95

Drag Specialties 50A Circuit Breaker 1970-1999 Harley-Davidson Big Twin/XL 1999 Twin Cam
$12.43

Cycle Standard Shift Lever - 1990-2017 Harley-Davidson Dyna/Softail - Chrome - OEM# 34564-90A
$31.03

Colony #2714-36 Instrument Panel Base Restoration Kit 1939-1946 Harley-Davidson Big Twins
1 review $49.50

Colony #2490-1 Seat Post/Frame Tube/Frame Head Wire Clip 1936-1949 Harley-Davidson Big Twin - Parkerized
$16.50

Colony #9695-26 Transmission Mounting Kit 1936-1964 Harley-Davidson Big Twin - Parkerized
2 reviews $49.41

Colony #8232-26 Transmission Mounting Kit 1936-1964 Harley-Davidson Big Twin - CAD Plated
1 review $49.41

Colony #9927-28 Upper & Lower Motor Mounting Allen Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
$49.25

Colony #8738-10 Disc Brake Rotor Bolt & Nut Kit Harley-Davidson FL/FX/XL - Chrome Plated
1 review $16.38

Colony #9622-16 Lifter Base Screw Kit 1936-1953 Harley-Davidson Big Twin 1937-1973 45's - Parkerized
2 reviews $16.35

Colony #3533-3 Front Brake Cable Clip 1950-1971 Harley-Davidson FL/FLH - CAD Plated
2 reviews $16.34

James Gaskets Exhaust Gasket/Mounting Kit for Harley-Davidson 1984-2013 Big Twins and 1986-2013 XL
15 reviews $24.43

Colony #2085-2 Seat Post Bushing Installation Tool 1958-1984 Harley-Davidson Big Twins - Parkerized
$48.73

Colony #7350-15 Acorn Primary Cover Screw Kit 1971-Up & All 4 Speed Harley-Davidson Big Twins - Chrome Plated
$48.73

Colony #2593-5 Front Brake Control Wire Lower Connection Kit 1928-1948 Harley-Davidson Big Twins 1928-1950 45s - Parkerized
4 reviews $24.20

Colony #9217-4 Handlebar Bolt Kit Harley-Davidson 1936-1948 Big Twin Springers 1940-Up 45 Springers - Chrome Plated
$12.10

Colony #3785-1 Inner Primary Cover Reinforcement Ring 1936-1954 Harley-Davidson Knucklehead/Panhead
$24.00

Colony #9009-5 Linkert Carb Support Bracket 1941-1953 Harley-Davidson OHV OEM# 27431-41 - Parkerized
$15.95

Colony #9833-24 Rocker Cover Allen Screw Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - Chrome Plated
2 reviews $23.91

Colony #8801-2 Transmission Fill Plug 1940-1984 Harley-Davidson Big Twin 4 Speed - Chrome Plated
1 review $15.94

Colony #9521-22 Upper & Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - Chrome Plated
$47.80

Colony #2205-4 Swing Arm Pivot Hex Bolts 1984-1999 Harley-Davidson Softail - Chrome Plated
$47.38

#3099-2 Starter Clutch to Mainshaft Nut Lockwasher Kit Harley 1941-67 FL FLH — Colony #3099-2 Starter Clutch to Mainshaft Nut Lockwasher Kit 1941-1967 Harley-Davidson FL/FLH
2 reviews $7.87

Colony #3664-10 Disc Rotor Allen Screw & Nut Kit 1979-1991 Harley-Davidson XL/FX (Spoked Wheel) - Zinc Plated
$15.73

Drag Specialties Starter Brake Light and Fuel Pump Relay 1991-2007 Harley-Davidson Big Twin Models (w/diode)
$15.55

Colony #7500-2 Oversize Timing Plug/Oil Tank Plug & Tap Kit 11/16-16 Thread - Chrome Plated
$46.35

Colony #3571-10 Disc Brake Rotor Allen Screw Set 1978-1982 Harley-Davidson FX/XL - Zinc Plated
2 reviews $15.43

Lowbrow Customs Banded Screw-In Gas Cap for Harley-Davidson 1996 & later - Aluminum
10 reviews $46.24

Cycle Standard Clutch Cable OEM 38602-92 Harley Dyna 1992-2005 - Blacked Out
$46.07 $56.33

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.