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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The Rough Trade Passenger Peg Mounts For Harley-Davidson Duo-Glides
$27.69

Cycle Standard High-Flow Washable Air Filter Element for 1990-1999 Harley 80 inch Evo #29330-96
1 review $27.58

Colony #8747-12-P Oil Pump Mounting Kit Smooth Allen Screw Kit 1978-1991 Harley-Davidson Shovelhead & Evolution - Chrome Plated
$13.78

Colony #2573-4 Shock Mounting Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
2 reviews $27.50

Colony #9694-19 Oil Pump Mounting Kit 1936-1967 Harley-Davidson OHV Big Twin - Parkerized
3 reviews $27.50

Colony #2142-12 Pushrod Cover Seal Kit 1979-1984 Harley-Davidson Shovelhead
4 reviews $13.40

Colony #8009-2 Front Fender Brace Clip Lock Kit 1934-1948 Harley-Davidson Big Twins & 1940-1954 45's
$13.40

Colony #9667-8 Oil Tank Mounting Kit - 1936-1957 Harley-Davidson Kuncklehead/Panhead - Parkerized
$13.40

Cycle Standard Foot Peg Spring Washers - 10 Pack
$13.35

Colony #2914-2 Rocker Stud Spacer Kit 1931-1940 Harley-Davidson Big Twin - CAD Plated
$13.31

Colony #3425-10 Disc Brake Rotor Bolt Kit 1973-1980 Harley-Davidson FL Rear 1973-1974 FL Front 1973 FX/XL Front - Zinc Plated
2 reviews $13.31

Cycle Standard Headlight Visor - 7" Headlight - Black - Replaces OEM #69734-05
$24.78 $35.40

Cycle Standard Headlight Visor - 7" Headlight - Chrome - Replaces OEM #69734-05
1 review $24.78 $35.40

Colony #9503-1 Timing & Oil Tank Plug 1938-1951 Harley-Davidson All Models OEM# 2326-38 - CAD Plated
$8.80

Colony #8842-10 Sprocket Allen Bolt & Nut Kit 1985-1992 Harley-Davidson Big Twin - Chrome Plated
$26.40

Colony #8834-10 Sprocket Nut & Bolt Kit Allen Head 1973-Up Harley-Davidson Big Twin/XL - Spoked Wheel - Chrome Plated
1 review $26.40

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

Colony #7158-2 Linkert Carburetor Fitting For 1/4 inch ID Hose
2 reviews $8.78

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

Colony #2074-6 Tappet Oil Screen/Pump Check Valve/Relief Valve Set 1981-Up Harley-Davidson Big Twin - Chrome Plated
2 reviews $26.07

Colony #8752-19 Transmission Side Cover 1936-1984 Harley-Davidson Big Twin - Chrome Plated
$26.06

Colony #8799-12 Primary Cover Screw Kit 1969-1969 Harley-Davidson Big Twin - Chrome Plated
$26.06

Colony #8447-8 Lifter Base Cap Screw Kit 1936-1975 Harley-Davidson OHV Big Twins - Chrome Plated
$25.71

Colony #2794-6 Grease Zerk Fitting 1936-1984 Harley-Davidson - 6 Pack - Parkerized
5 reviews $12.74

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

Colony #8754-2 Generator Allen Screw Kit 1958-1969 Harley-Davidson Panhead/Shovelhead - Chrome Plated
1 review $12.74

Colony #3358-4 Handlebar Riser Cupped Washers 1973-Up Harley-Davidson All Models - Zinc Plated
$12.71

Colony #2696-5 Linkert Low Speed Needle Valve 3-1/2 inch 1948-1965 Harley-Davidson Type 2 Heads
$25.30

Cycle Standard Shift Lever - 1974-1984 Harley-Davidson FL 1980-1986 FXWG (With Splines) - Chrome - OEM #34606-74
$25.27

Colony #2772-22 Exhaust System Mounting Bolt Kit 1941-1957 Harley-Davidson Knucklehead/Panhead - Parkerized
$25.08

Colony #2566-2 Transmission Drain Plug 1981-1992 Harley-Davidson FLT/FXR - Chrome Plated
1 review $12.53

Colony #3068-30 Primary Cover Screw Kit 1956-1964 Harley-Davidson Big Twins - CAD Plated
1 review $25.00

Colony #3067-30 Primary Cover Screw Kit Harley-Davidson 1950-1955 Big Twins - CAD Plated
2 reviews $25.00

Colony #3633-2 Footpeg Rubbers 1952-1990 Harley-Davidson K/KH/XL 1971-1991 FX
$24.99

Cycle Standard Headlight Visor - 7" Headlight - Chrome - Replaces OEM #69733-05
1 review $24.78 $35.40

Colony #7112-19 Transmission Side Cover & Clutch Arm Acorn Nut Kit - 1936-1984 Harley-Davidson Big Twin 4 Speeds - Chrome Plated
3 reviews $24.71

Colony #8703-2 Oil Pump Screen Check Relief Plug 1981-Up Harley-Davidson Big Twins - Chrome Plated
$12.34

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 #8742-14 Oil Pump Mounting Kit 1967-1977 Harley-Davidson Big Twins - Chrome Plated
$24.37

Colony #7411-2 Sprocket Shaft Seal Assembly Replaces 1936-1954 Harley-Davidson Big Twins
1 review $24.26

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 #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

Cycle Standard 39MM Lower Fork Slider Bushings - 0.778" - 1988-2015 Harley-Davidson Sportster XL 1988-1994 FXR 1991-2005 FXD OEM# 45465-87
$12.00

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

Colony #9904-17 Inner Primary Mounting Kit 1986-2000 Harley-Davidson FLT/FXR
2 reviews $24.00

Colony #3461-14 Rear Fender Mounting Kit 1930-1936 Harley-Davidson VL - Parkerized
$23.98

Cycle Craft #42 Pilot Jet - 1988-2006 Keihin CV Carburetor
3 reviews $5.99

Cycle Craft #40 Pilot Jet - 1988-2006 Keihin CV Carburetor
1 review $5.99

Colony #9612-13 Transmission Top Cover Screw Kit 1936-1955 Harley-Davidson Big Twin - Chrome Plated
$23.90

Colony #3693-20 Rear Fender Rail Screw Kit 1972-1986 Harley-Davidson FX - Chrome Plated
1 review $23.65

Cycle Standard Screw-In Harley Stock Style Non-Vented Gas Cap - Left Side - 1996 & up - Black
$23.51

Colony #7716-2 Dash Cover Mounting Center Screw & Stud Kit All 1947-1967 Harley-Davidson
2 reviews $23.18

Colony #8931-16-P Rocker Cover Smooth Allen Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - Chrome Plated
$23.01

Colony #3003-3 Oil Line Banjo Bolt and Washer Kit 1936-1937 Harley-Davidson Knucklehead 1937 Flathead/Sidevalve
$11.50

Cycle Standard Kickstand Bumper Rubber - 1985-2000 Harley-Davidson Touring Models OEM #50059-85A
2 reviews $7.62

Cycle Standard Kickstand Bumper Rubber - 1991-2000 Harley-Davidson Dyna OEM #50054-90
3 reviews $7.62

Colony #9100-8 Cylinder Base Nut Set 1978-1984 Harley-Davidson Shovelhead OEM #16838-78 - Chrome Plated
2 reviews $22.75

Colony #2070-1 Oil Line Fitting Chrome 1/8 NPT Thread for 3/8 inch Hose OEM #63533-41 - Chrome Plated
6 reviews $4.54

Gasbox Front Pipe to Frame Clamp Set for 1958 - 1969 Harley-Davidson FL Models - Parkerized - OEM #65513-58, 65512-37A
4 reviews $22.50

The Rough Trade Valve Spring Cover Adjustment Wrench Set for Harley-Davidson Big Twin
$22.31

Colony #9977-1 Fork Stem Cap 1986-Up Harley-Davidson FLST/FXR/FXD/XL - Chrome Plated
1 review $11.14

Colony #9742-6 Front Fender Mounting Kit 1936-1948 Harley-Davidson Springers - Chrome Plated
$22.09

Colony #9785-9 Transmission Shifter Cover Acorn 1991-Up Harley-Davidson Dyna - Chrome Plated
$22.09

Colony #3768-5 Rubber Grommets Harley-Davidson OEM #11410 - 5 Pack
1 review $11.00

Colony #3747-2 Steering Damper Friction Washers 1930-1948 Harley-Davidson All Models 1949-1957 45's/Servi-car
$22.00

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

Colony #3346-1 Horn Power Pack Rubber Mount 1954-1964 Harley-Davidson FL/FLH/XL/XLH
$22.00

Colony #9402-1 Timing Plug 1970-Up Harley-Davidson OEM #720 - Chrome 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 #7611-2 Rocker Busing Installation Tool 1930-1948 Harley-Davidson Big Twins
3 reviews $22.00

Colony #3364-1 Carburetor Choke Rod 1948-1965 Harley-Davidson OHV Big Twins - CAD Plated
1 review $21.99

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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