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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Colony #9633-50 Flatwashers Harley-Davidson FL/FX/XL OEM #6099 - Chrome Plated
6 reviews $14.52

Colony #9897-6 Grease Fitting Zerk Type 1936-1984 Harley-Davidson - Chrome Plated
2 reviews $14.34

Colony #2072-4 Gas Tank Mounting Kit Countersunk 1991-1999 Harley-Davidson Softail - Chrome Plated
$14.34

Colony #8717-4 Acorn Head Headlight Visor Mounting Bolt 1959-Up Harley-Davidson XL/FX/FXR - Chrome Plated
$7.17

Colony #8201-10 Star Shaped Wheel Hub Outer Cover Screw Kit Fits 1936-1966 Harley-Davidson - CAD Plated
$7.17

Colony #8152-2 Generator Screw Kit 1936-1957 Harley-Davidson Big Twin - CAD Plated
3 reviews $7.17

Colony #2769-4 Kick Starter Pedal Mounting Kit 1917-1941 Harley-Davidson - Parkerized
$14.30

Colony #3233-10 Shifter Assembly Cover Screw Kit 1965 - early 1979 Harley-Davidson FL FX — Colony #3233-10 Shifter Assembly Cover Screw Kit 1965-E1979 Harley-Davidson FL/FX
$14.22

Colony #9108-2 Generator Screws 1930-1948 Harley-Davidson Big Twin Sidevalves OEM# 1523-30 - Chrome Plated
$13.94

Colony #8485-1 Stem Nut Reproduction 1936-1948 Harley-Davidson Big Twin Springers - CAD Plated
$13.94

Colony #3292-9 Rear Chain Guard Mounting Kit 1963-1982 Harley-Davidson FL/FLH - CAD Plated
$13.92

Colony #2745-2 Oversized Ignition Timer Cover Stud Kit 1972-1979 Harley-Davidson Big Twin - Zinc Plated
$13.92

Colony #2540-2 Ignition Timer Cover Stud Kit 1980-Up Harley-Davidson Big Twin/XL - Zinc Plated
$13.92

Colony #2439-1 Transmission and Motor Case Drain Plug 1937-1986 Harley-Davidson Big Twin - Chrome Plated
$6.96

Colony #2778-4 Tail Light Bracket Mounting Kit 1947-1948 Harley-Davidson Tombstone
2 reviews $4.54

Colony #8170-10 Cylinder Head Bolt Washers OEM #6469 All 1948-Up Harley-Davidsons - CAD Plated
$6.78

Colony #3401-16 Rocker Cover Allen Screw Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - CAD Plated
$13.55

Cycle Standard Oil Filter for Harley-Davidson Dyna Softail and Touring Models - Black - OEM #63798-99A 63731-99
5 reviews $13.55

Colony #9863-5 Transmission Case Bottom Stud Kit 1984-Up Harley-Davidson Softail
1 review $13.55

James Gaskets Points Cover Gasket 1971-1978 Harley-Davidson Big Twin
1 review $1.34

Colony #8744-12 Oil Pump Mounting Kit 1978-1991 Harley-Davidson Big Twin - Chrome Plated
1 review $13.40

Colony #2913-2 Rocker Stud Spacer Kit 1931-1940 Harley-Davidson Big Twins - Parkerized
$13.31

Colony #9012-5 Linkert Carb Support Bracket 1939-1948 Harley-Davidson OEM #1110-39 - Parkerized
$13.20

Colony #7616-1 Transmission Filler Plug 1936-Up Harley-Davidsons - CAD Plated
$13.20

Colony #9987-4 Rear Wheel Adjusting Screw Flat Head Allen 1991-Up Harley-Davidson Dyna Glide - Chrome Plated
$13.16

Colony #9965-4 Footpeg Mounting Shoulder Bolt/Nut Kit 1952-Up Harley-Davidson FX/FL/XL - CAD Plated
$13.16

Colony #8764-2 Point Cover Allen Head Screws 1970-1978 All Harley-Davidson - Chrome Plated
$4.38

Cycle Standard Oil Filter for Harley-Davidson Dyna Softail and Touring Models - Chrome - OEM #63798-99A 63731-99
8 reviews $12.90

Colony #2090-2 Swing Arm End Plates 19819-1994 Harley-Davidson FXR 1979-2001 FLT - Chrome Plated
3 reviews $12.74

Colony #2853-6 Upper Engine Mounting Kit 1984-1999 Harley-Davidson Softail - Zinc Plated
1 review $12.71

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

Colony #3132-5 Front Brake Hand Lever Bracket Clamp Kit CAD all Harley 1955-64 — Colony #3132-5 Front Brake Hand Lever Bracket Clamp Kit 1955-1964 Harley-Davidson All Models - CAD Plated
$12.34

Colony #8702-2 Oil Pump Check Valve Plug 1936-1980 Harley-Davidson Big Twins OEM #26362-36 - Chrome Plated
1 review $12.34

Colony #8905-7 Transmission Shifter Cover Allen Head Screw Kit 1980-1986 Harley-Davidson Big Twin - Chrome Plated
$12.29

Colony #2375-1 Pinion Gear Shaft Nut 1981-1989 Harley-Davidson Big Twins
$12.10

Colony #3696-4 Exhaust Port Nuts 1984-1999 Harley-Davidson Big Twin 1986-Up XL 1999-Up Twin Cam - Chrome Plated
$6.05

Colony #3228-1 Upper Fork Bearing Adjustment Nut 1949-1984 Harley-Davidson 4-speed Big Twins 1993-2005 FXDWG 1984-2006 Softail - Zinc Plated
2 reviews $12.10

Colony #3247-2 Shock Stud Spacer Kit 1965-1985 Harley-Davidson FLH
$6.05

Colony #2990-2 Generator Screw Kit CAD Special 5/16 inch case holes Harley Big Twins 36-57 — Colony #2990-2 Special Generator Screw Kit 5/16 inch Case Holes 1936-1957 Harley-Davidson Big Twins - CAD Plated
2 reviews $12.10

Colony #2951-1 Wire Clip 1951-1969 Harley-Davidson Big Twins 1963-E1967 Servi-car - Parkerized
1 review $12.10

Colony #2712-1 Brake Shaft Cross Over Bushing Installation Tool 1937-1957 Harley-Davidson Big Twins
1 review $12.10

Colony #2042-5 Rear Axle Clip 1991-Up Harley-Davidson FL/FX/XL OEM #510 - Chrome Plated
1 review $12.10

Colony #9876-2 Oil Screen Plug 1970-1980 Harley-Davidson Big Twins - Chrome Plated
$11.96

Colony #2324-2 Air Cleaner Cover Mounting Screws 1966-1977 Harley-Davidson Big Twin 1956-1977 XL - Chrome Plated
1 review $5.95

Colony #3393-10 Handlebar Lever Mounting Screw Kit 1982-1995 Harley-Davidson Big Twin & Sportsters
1 review $11.62

Colony #9985-24 Valve Cover Washers 1954-1965 Harley-Davidson Panhead - CAD Plated
$11.56

Colony #3531-9 Horn Face Screw & Nut Kit 1931-1957 Harley-Davidson Springer Models - CAD Plated
$11.50

Cycle Standard Neutral Indicator Light for Harley-Davidson OEM #68024-92A
7 reviews $11.39

Colony #2291-8 Front Fender Mounting Kit 1951-1978 Harley-Davidson FL/FLH - CAD Plated
1 review $11.17

Colony #9608-2 Oil Pump Relief Valve Plug 1968-1980 Harley-Davidson Big Twins - CAD Plated
2 reviews $11.14

Colony #9606-2 Oil Pump Relief Valve Plug 1954-1967 Harley-Davidson Big Twin - CAD Plated
$11.14

Colony #9604-2 Oil Screen Plug 1952-1965 Harley-Davidson Big Twin - CAD Plated
$11.14

Colony #8849-2 Circuit Breaker Post Rebuild Kit 1948-1969 Harley-Davidson FL/XL/K/45's
$11.14

Colony #3734-4 Tombstone Tail Light Studs 1947-1954 Harley-Davidson - CAD Plated
$11.00

Colony #8780-4 Pushrod Tappet Adjuster Locknuts Harley-Davidson OHV Big Twins/45's/XL/K models OEM #18570-38
4 reviews $11.00

Colony #3694-4 Rear Fender Support Spacers 1972-1986 Harley-Davidson FX - Zinc Plated
$10.89

Colony #3209-4 Lifter Base Screw Kit 1957-1985 Harley-Davidson Sportster - CAD Plated
1 review $10.65

Colony #3547-5 Sprocket Bolt Washer Kit 1973-Up Harley-Davidson Big Twins 1979-Up XL - Zinc Plated
$10.59

Colony #3621-4 Brake Light Switch Mounting Kit 1939-1957 Harley-Davidson Big Twins - Chrome Plated
$10.45

Colony #9204-3 Clutch Lever Rod Bolt 1952-1964 Harley-Davidson Big Twin OEM #36921-52 - CAD Plated
$10.37

Colony #9674-1 Long Oil Pump Nut Pre-1967 Harley-Davidson All Models - Parkerized
$5.18

Colony #3705-2 Brake Caliper Bleeder Screws 2009-Up Harley-Davidson Touring 2008-Up V-Rod - Chrome Plated
$10.29

Colony #2796-2 Rear Brake Cross Over Shaft Grease Fitting 1938-1957 Harley-Davidson Big Twin - CAD Plated
2 reviews $10.29

Colony #2749-4 Handlebar Bolt Kit 1936-1939 Harley-Davidson Big Twin - Parkerized
$10.29

Colony #9306-7 Timing Cover Screw Kit 1970-1980 Harley-Davidson Shovelhead - CAD Plated
$10.04

Colony #7503-1 Oversized Drain Plug 1965-Up Harley-Davidson Big Twins 1967-Up Sportster - Chrome Plated
$10.04

The Rough Trade Original Tool Kit Reproduction Wrench Set for Harley-Davidson Panheads
$10.00

Colony #3770-4 1/2 x 5/16" x 5/16" Spacer Harley-Davidson OEM #67009-72 - 4 Pack
$9.90

Colony #3762-5 Dash Cover Mounting Kit 1936-1946 Harley-Davidson Twins - Parkerized
$4.95

Colony #3713-3 Instrument Panel Cover Plate Right Side 1939-1946 Harley-Davidson All Models - CAD Plated
$9.90

Colony #3658-8 Circuit Breaker To Coil Wire Fastener Assembly 1949-1964 Harley-Davidson Twins/K/KH/Sportster
$9.90

Colony #3596-2 Swing Arm End Plates 1991-2005 Harley-Davidson Dyna - Zinc Plated
$9.68

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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