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 #3653-3 Primary Inspection Cover Kit - Black Powdercoat - 1929-1952 Harley-Davidson 45's 1932-1973 Servi-car 1930-1936 VL
$22.50

Colony #3643-3 Shift Rod Stud 1951-E1979 Harley-Davidson FL - Chrome Plated
$11.55

Colony #3631-6 Front Stand Spring Kit 1931-1948 Harley-Davidson Big Twins - Parkerized
$11.55

Colony #3628-2 Speedo Drive Unit Retainer 1937-1952 Harley-Davidson WL - CAD Plated
$7.43

Colony #3627-2 Speedo Drive Unit Retainer 1937-1952 Harley-Davidson WL - Chrome Plated
$8.25

Colony #3622-1 Oil Pump Feed Line Nut 1938-1957 Harley-Davidson Big Twins - CAD Plated
$7.70

Colony #3460-5 Chain Tensioner Plate/Pad Mounting Kit 1965-1982 Harley-Davidson FL/FX/FXR - Parkerized
$14.85

Colony #3613-1 Horn Bracket Spring Plate 1942-1954 Harley-Davidson All Models
$8.80

Colony #3611-2 Horn Bracket Spring Plate 1936-1941 Harley-Davidson All Models
$12.10

Colony #3610-2 Horn Bracket Spring Plate 1936-1941 Harley-Davidson All Models
$14.85

Colony #3615-1 Horn Bracket Reinforcement 1936-1948 Harley-Davidson Big Twins 1940-1957 45's
$14.85

Colony #8318 Stock Hardware Kit Late 1930-1936 Harley-Davidson VL - Parkerized
$302.50

Colony #8323 Stock Hardware Kit Early 1930 Harley-Davidson VL - Parkerized
$302.50

Colony #3672-10 Knurled Allen Sprocket Bolts 1985-1992 Harley-Davidson Big Twin - Chrome Plated
$20.63

Colony #3092-24 Valve Spring Cover Kit 1937-1938 Harley-Davidson Big Twin Side Valve - Chrome Plated
$231.00

Colony #3091-24 Valve Spring Cover Kit 1930-1936 Harley-Davidson VL - Chrome Plated
$231.00

Colony #2899-2 Tool Box Strap Mounting Kit 1940-1945 Harley-Davidson Military Big Twins - Parkerized
$12.10

Colony #1027 Complete Show Bike Kit Knurled Allen 2007-Up Harley-Davidson VRSC - Chrome Plated
$112.28

Colony #3691-15 Plain Head Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Parkerized
$39.88

Colony #3689-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - CAD Plated
$39.88

Colony #3688-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Chrome Plated
$43.45

Colony #3686-12 Lower Motor Mount Kit 1966-1969 Harley-Davidson OHV Big Twins - CAD Plated
$33.00

Colony #3684-12 Lower Motor Mount Kit 1966-1969 Harley-Davidson OHV Big Twins - Parkerized
$33.00

Colony #3570-10 Front Disc Brake Rotor Allen Screw Set 1978-1983 Harley-Davidson FXWG - Zinc Plated
$11.20

Colony #3565-1 Air Cleaner Spring 1941-1965 Harley-Davidson FL 1941-1948 UL 1941-1952 WL - Parkerized
$14.52

Colony #3551-4 Triple Clamp Bolt 1930-1931 Harley-Davidson Twins - Parkerized
$35.20

Colony #3541-4 Windshield Apron Coil Clips and Screw Kit 1941-1948 Harley-Davidson Winshields - Parkerized
$13.01

Colony #3536-16 Head Bolt Set 1940-1951 Harley-Davidson WR/WLDR - CAD Plated
$109.62

Colony #3517-2 Front Brake Lever Clevis Pin 1952-1972 Harley-Davidson K/KH/XL 1971-1972 FX 1951-1957 Servi-car - Parkerized
$7.57

Colony #3512-4 Tappet Adjuster Locknuts 1915-1939 Harley-Davidson Singles/45s/74"/80" - Parkerized
$12.10

Colony #3450-6 Leg Shield U-bolt Mounting Kit 1948-E1951 Harley-Davidson Big Twins - Parkerized
$26.40

Colony #3528-2 Manifold Intake Nipple Brass Seals 1923-1924 Harley-Davidson DCA/DCB 1925-1929 74" 1928-29 61"
$7.87

Colony #3507-2 Crankcase Relief Plug Harley-Davidson WLA - Parkerized
$12.10

Colony #3504-2 Manifold Intake Nuts 1923-1924 Harley-Davidson DCA/DCB 1925-19-29 74" 1928-1929 61" L - Nickel Plated
$30.80

Colony #3503-2 Manifold Intake Nipples 1923-1924 Harley-Davidson DCA/DCB 1925-19-29 74" 1928-1929 61" L - Nickel Plated
$49.50

Colony #3495-1 Rear Support Rod Nut Kit 1930-1935 Harley-Davidson VL - Parkerized
$24.20

Colony #3471-3 Foot Brake Lever Stud 1923-1929 Harley-Davidson 61" and 74" Twins - Parkerized
$20.90

Colony #3466-1 Rear Axle Spacer 1930-1936 Harley-Davidson VL OEM# 3955-30 - Parkerized
$14.52

Colony #3465-1 Rear Axle Spacer 1930-1936 Harley-Davidson VL OEM# 3953-30 - Parkerized
$16.94

Colony #3463-1 Choke Lever 1966 Harley-Davidson FL/FLH 1966 XLH/XLCH - CAD Plated
$43.99

Colony #3462-1 Choke Lever 1936-1937 Harley-Davidson Knucklehead - CAD Plated
$38.50

Colony #3369-2 Air Cleaner Connection Mounting Screws Harley-Davidson 1932 45 Twins and 1930-1934 74" Twins - CAD Plated
$7.26

Colony #8306 CAD Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Aluminum Head - CAD Plated
$339.82

Colony #8305 CHR Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Cast Iron Head - Chrome Plated
$388.19

Colony #8305 PARK Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Cast Iron Head - Parkerized
$305.07

Colony #8304 PARK Complete Stock Hardware Kit - 1937-1939 Harley-Davidson 74 & 80 Cast Iron Head - Parkerized
$306.59

Colony #8304 CAD Complete Stock Hardware Kit - 1937-1939 Harley-Davidson 74 & 80 Cast Iron Head - CAD Plated
$306.59

Colony #8836-10 Sprocket Nut & Bolt Kit Acorn Head 1973-Up Harley-Davidson Big Twin/XL - Spoked Wheel - Chrome Plated
$29.70

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

Colony #8800-12 Primary Cover Allen Screw Kit 1965-1969 Harley-Davidson Big Twin - CAD Plated
$22.00

Colony #8713-8 Lifter Base Screw Kit Pre-1976 Harley-Davidson Cases With Late Lifters - Black
$14.34

Colony #8712-8 Lifter Base Screw Kit Pre-1976 Harley-Davidson Cases With Late Lifters - CAD Plated
$14.34

Colony #8624-2 Front Brake Cable Adjusting Screw 1941-1948 Harley-Davidson Big Twin/45's 1941-1957 Servi-Car - CAD Plated
$21.12

Colony #8613-1 Transmission Fill Plug 1941-Up Harley-Davidson 45's - CAD Plated
$18.72

Colony #8481-20 Primary Cover Acorn Head Screw Kit 1980-1984 Harley-Davidson Big Twin 5 Speed - Chrome Plated
$48.73

Colony #8406-1 Self Tapping Transmission Filler Plug 1936-Up Harley-Davidson Big Twin - Chrome Plated
$18.70

Colony #8404-27 Transmission Screw & Acorn Head Nut Kit 1980-1985 Harley-Davidson FLT 5 Speed - Chrome Plated
$64.09

Colony #8216-18 Head Bolt Kit 1940-1947 Harley-Davidson Alloy Flathead 74 & 80 - Chrome Plated
$123.48

Colony #8138-34 Motor Case Kit Stock 1965-1969 Harley-Davidson Big Twin - CAD Plated
$51.70

Colony #8133-34 Motor Case Kit Acorn Head 1948-1964 Harley-Davidson Panhead - Chrome Plated
$63.61

Colony #8130-34 Motor Case Kit Acorn Head 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$63.61

Colony #8128-34 Motor Case Kit Stock 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$58.30

Colony #8405-2 Transmission Filler Cap/Dipstick 1985-1986 Harley-Davidson FLT 5 Speed - Chrome Plated
$18.34

Colony #8206-9 Tool Box Mounting Kit 1935-1954 Harley-Davidson - CAD Plated
$22.00

Colony #8171-8 Cylinder Base Nut Lockwashers All 1930-1977 Harley-Davidson Big Twins - CAD Plated - OEM #7055
$4.76

Colony #8108-1 Long Oil Pump Nut Pre-1967 Harley-Davidson Big Twins - Chrome Plated
$7.17

Colony #8016-4 Chrome Plated Acorn Dash Mounting 1977-1985 Harley-Davidson FX - Chrome Plated
$14.74

Colony #8004-4 Intake Manifold Conversion Nipple Kit/Panhead O-ring Style Manifold 1936-1939 Harley-Davidson OHV Small Port Heads
$39.47

Colony #7713-20 Head Bolt Set CAD Plated 1936-1939 Harley-Davidson Knucklehead - CAD Plated
$64.09

Colony #7712-36 Head Bolt Set 1940-Up Harley-Davidson 45's 1930-1947 Flathead 74's/80's with Iron Heads - CAD Plated
$97.04

Colony #7711-18 Head Bolt Set CAD Plated 1940-1947 Harley-Davidson Flathead 74's/80's with Aluminum Heads - CAD Plated
$98.48

Colony #7628-8 Lifer Base Screw Kit 1976-Up Harley-Davidson 74's - Chrome Plated
$25.71

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.