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 #8775-4 Dash Mounting Kit Button Allen 1977-1985 Harley-Davidson FX - Chrome Plated
$9.16

Colony #9013-4 Linkert Carb Support Bracket 1936-1952 Harley-Davidson OEM #27432-36 - Parkerized
$12.65

Colony #8854-4 Front Axle Nut Kit 1937-1952 Harley-Davidson 45 Solo OEM #3910-37 - Chrome Plated
$8.36

Colony #8718-4 Cap Head Headlight Visor Mounting Bolt 1959-Up Harley-Davidson XL/FX/FXR - Chrome Plated
$7.17

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

Colony #8874-2 Seat Post Rod Lock Nut & Lockwasher 1925-1981 All Harley-Davidson Models (Except FX/XL) - CAD Plated
3 reviews $9.35

Colony #8797-4 Handlebar Lever Mount Allen Screw Pre-1972 Harley-Davidson FX/FL/XL - Chrome Plated
$5.96

Colony #8735-24 Valve Cover Screws 45/64 inch Long 1954-1965 Harley-Davidson Panhead With Steel D-Rings - CAD Plated
1 review $34.93

Colony #8733-24 Valve Cover Screws 1-1/4 inch Long 1954-1965 Harley-Davidson Panhead With Alloy D-Rings - CAD Plated
$34.93

Colony #8876-5 Seat Bar Bushing Set 1965-1980 Harley-Davidson Big Twin - CAD Plated
1 review $33.31

Colony #8875-5 Seat Bar Bushing Set 1937-1964 Harley-Davidson Big Twin 1929-1973 45 Solo/Servi-Car - CAD Plated
$33.31

Colony #8614-4 Rocker Shaft End Caps 1971-Up Harley-Davidson Shovelhead 1971-1984 XL - Chrome Plated
$33.31

Colony #8223-8 Rocker Shaft End Plug & Cap Kit 1966-1970 Harley-Davidson Shovelhead 1957-1970 XL - CAD Plated
1 review $31.81

Colony #8858-8 Cylinder Base Stud Set 1954-1985 Harley-Davidson K/XL OEM #16830-54 & 16830-72
2 reviews $30.42

Colony #8835-10 Sprocket Bolt & Washer Kit Allen Head 1993-1998 Harley-Davidson Big Twin Spoke Wheel 1979-1990 XL Cast Wheel - Chrome Plated
1 review $30.79

Colony #8821-18 Top of Tank Screw & Washer Kit 1918-1936 All Harley-Davidson 1936-1952 45s - Nickel Plated
$31.14

Colony #8822-18 Top of Tank Screw & Washer Kit 1918-1936 All Harley-Davidson 1936-1952 45s - CAD Plated
$30.04

Colony #8750-14 Transmission Top Cover Allen Screw 1936-1964 Harley-Davidson Big Twin - Chrome Plated
$28.97

Colony #8490-8 Lifter Base Acorn Head Screw Kit Harley-Davidson Late Shovelhead Lifter to 1/4-24 Motor Case - Chrome Plated
$27.51

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

Colony #8707-6 Tappet Oil Screen/Oil Pump Check Valve/Relief Valve Plug Set 1981-Up Harley-Davidson Big Twin OEM #26263-80 - Chrome Plated
4 reviews $26.07

Colony #9002-4 Evo Cap Head Bolt Covers 1984-1985 Harley-Davidson FL/FX/XL - Chrome Plated
1 review $25.71

Colony #9000-4 Evo Acorn Head Bolt Covers 1984-1985 Harley-Davidson FL/FX/X - Chrome Plated
1 review $25.71

Colony #8868-16 Rocker Box Screw Kit Acorn Head 1985-Up Harley-Davidson FL/FX/XL - Chrome Plated
2 reviews $25.72

Colony #8755-12 Timing Cover Screw Kit 1936-1969 Harley-Davidson Big Twin - Chrome Plated
2 reviews $24.62

Colony #8010-10 Front Brake Shackle Rebuilding Kit 1940-1948 Harley-Davidson Big Twins & 45's
$90.88

Colony #7157-20 Heat Treated Acorn Head Bolt Kit - 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$66.63

Colony #7714-20 Head Bolt Set CAD Plated 1940-1947 Harley-Davidson Knucklehead Engines - CAD Plated
$64.09

Colony #7133-8 Stock Aluminum Pushrod Covers - 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$80.00

Colony #8777-20 Head Bolt Allen Screw Kit 1948-Up Harley-Davidson Panhead/Shovelhead - Chrome Plated
$57.94

Colony #7517-8 Knucklehead Rocker Arm Cover Nut Strip & Screw Plate Kit 1936-1947 Harley-Davidson Knucklehead
1 review $57.94

Colony #8164-19 Upper And Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin OHV - Chrome Plated
5 reviews $57.53

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

Colony #7610-4 Rocker Stud Bushing Set 1930-1948 Harley-Davidson Big Twin Springers
1 review $48.88

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

Colony #7706-2 Springer Spring Rod Bushings Harley-Davidson 45's And 1931-1945 Big Twin Springers
2 reviews $43.82

Colony #7410-1-US Sprocket Shaft Bearing Retainer with Lip Seal -.002 Undersized Threads 1955-1968 Harley-Davidson 74's
1 review $45.98

Colony #7410-1-OS Sprocket Shaft Bearing Retainer with Lip Seal +.002 Oversized Threads 1955-1968 Harley-Davidson 74's
$45.98

Colony #7707-4 Spring Rod Kit 1936-1947 Harley-Davidson 45's & Big Twin Springers
2 reviews $42.63

Colony #8202-18 Rear Fender Mounting Kit 1936-1957 Harley-Davidson Big Twins - CAD Plated
$42.00

Colony #7627-4 Weld-In Aluminum Intake Manifold Nipples 1948-1954 Harley-Davidson Panhead
$36.94

Colony #8005-12 Electrical Terminal Box Assembly1948-1969 Harley-Davidson Big Twins & 45's
2 reviews $55.04

Colony #7519-4 Aluminum Alloy Tubular Pushrods 1948-1952 61c.i. Harley-Davidson Panhead
$55.00

Colony #7506-4 Aluminum Alloy Tubular Pushrods 1948-1952 Harley-Davidson Panhead using 1966-Up Shovel Top End
1 review $55.00

Colony #7505-4 Aluminum Alloy Tubular Pushrods 1941-1947 Harley-Davidson 74 Knucklehead
$55.00

Colony #7146-12 Acorn Head Primary Cover Screw Kit - 1965-1970 Harley-Davidson 74's - Chrome Plated
3 reviews $36.20

Colony #7143-4 Knucklehead Type Rocker Arm Shaft End Plug - 1966-1970 Harley-Davidson Shovelhead 1957-70 Sportster - Chrome Plated
2 reviews $34.85

Colony #7129-12 Acorn Head Timing Cover Set - 1936-1969 Harley-Davidson 74's/61 OHV - Chrome Plated
$36.20

Colony #7710-18 Head Bolt Washer Kit 1940-1947 Harley-Davidson 45's/75's/80's with Aluminum Heads - CAD Plated
1 review $33.31

Colony #7808-4 Upper Pushrod Covers (Inner) 1957-1985 Harley-Davidson Sportster 1936-Early 1979 OHV Big Twins
3 reviews $34.05

Colony #7622-1 Fork Tube Bolt 1973-Mid 1985 Harley-Davidson XL/FX - Chrome Plated
1 review $32.60

Colony #7802-1 Acorn Stem Nut 1936-1977 Harley-Davidson Springers - Chrome Plated
3 reviews $21.73

Colony #7620-1 Fork Tube Cap/Bolt/Breather 1947-1977 Harley-Davidson Glide Front Ends - Chrome Plated
$21.73

Colony #7613-2 Spring Retainer & Acorn Nut Set 1936-1948 Harley-Davidson Big Twin Springers 1936-1952 45's
$20.65

Colony #7349-3 Rocker Box Oil Line Fittings 1942-1947 Harley-Davidson Knucklehead - Chrome Plated
1 review $20.27

Colony #8101-6 Swingarm End Cover Kit 1973-1984 Harley-Davidson FX/FL 1979-1992 XL 1981-1987 FXR - Chrome Plated
2 reviews $21.12

Colony #8203-6 Front Fender Mounting Kit 1936-1948 Harley-Davidson Springers - CAD Plated
$20.85

Colony #7705-4 Knucklehead Rocker Box Drain Tube Fitting Kit
$20.31

Colony #8015-4 Rear Stand Mounting Kit 1938-1957 Harley-Davidson Big Twins & 1939-Up 45's - Parkerized
1 review $20.57

Colony #7818-5 Shifter Lever Stud & Bushing Kit 1936-1954 Harley-Davidson - CAD Plated
$19.51

Colony #8162-3 Front Axle Nut Kit 1946-1971 Harley-Davidson Big Twins - Chrome Plated
$18.72

Colony #7605-4 Rocker Arm Thrust And Packing Washer Kit 1936-1947 Harley-Davidson Knucklehead
$18.15

Colony #7820-4 Rear Brake Cross Shaft Nut & Lock Kit 1930-1957 Harley-Davidson Big Twins - CAD Plated
$17.92

Colony #7148-3 Oil Line/Vent Fitting - Pre-1965 Harley-Davidson Davidson Big Twin - Chrome Plated
1 review $17.22

Colony #7816-1 Acorn Motor Sprocket Nut 1955-1976 Harley-Davidson Big Twin - Chrome Plated
1 review $16.73

Colony #7351-2 Transmission Pug Standard Size 1940-1984 Harley-Davidson 74's
$15.94

Colony #7156-2 Self-Tapping Transmission Side Cover Oil Plug - 1936-1984 Harley-Davidson Big Twin - Chrome Plated
$15.94

Colony #7821-6 Air Cleaner Mounting Screw & Lock Kit 1956-1965 Harley-Davidson Big Twins
$16.94

Colony #7609-6 Rocker Stud Lock Kit 1930-1948 Harley-Davidson Big Twin Springers
$15.14

Colony #8158-8 Linkert Carb Mounting Screws OEM #27422-39 - Chrome Plated
$14.74

Colony #8145-10 Circuit Breaker & Voltage Regulator Screws 1936-1964 Harley-Davidson OHV Twins - Chrome Plated
1 review $14.89

Colony #8118-1 Transmission Filler Plug 1936-Up Harley-Davidson Big Twins - Chrome Plated
1 review $16.50

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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