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 #8730-8 Rocker Shaft Chrome Plated Acorn Nut & Washer Kit 1966-1985 Harley-Davidson Shovelhead 1957-1985 Sportster - Chrome Plated
1 review $12.74

Colony #8701-2 Tappet Oil Screen Plug 1970-1980 Harley-Davidson Big Twins OEM #657 - Chrome Plated
1 review $12.74

Colony #8153-2 Generator Mounting Screws 1958-1969 Harley-Davidson Big Twins - Chrome Plated
2 reviews $12.74

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

Cycle Standard Bungee Nuts - 5/16-18
10 reviews $12.57

James Gaskets Generator Mounting Gasket 1958-1983 Harley-Davidson Big Twin
1 review $1.14

James Gaskets Replacement Float Bowl O-ring for 1988-1991 Harley-Davidson CV Carbs
$6.24

Colony #3546-2 Handlebar Grips End Plugs 1953-1961 Harley-Davidson K/KH/XL/45's/FL - CAD Plated
$12.10

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 #2991-2 Generator Screw Kit Special 5/16 inch case holes Harley Big Twins 36-57 — Colony #2991-2 Special Generator Screw Kit 5/16 inch Case Holes 1936-1957 Harley-Davidson Big Twins - Parkerized
$12.10

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

Colony #2799-1 Upper Fork Bearing Adjusting Nut 1948-1984 Harley-Davidson FL 1984-2009 FXST 1991-2005 FXDWG - CAD Plated
5 reviews $12.10

Colony #2807-1 Oversized Transmission and Oil Tank Drain Plug 2000-Up Harley-Davidson Big Twins - Chrome Plated
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 #3758-3 Chain Oiler Adjusting Screw Kit L1950-1964 Harley-Davidson OHV 1958-1969 Servi-car - Parkerized
$12.09

Colony #3049-7 Chain Oiler Adjusting Screw Kit 1932-E1950 Harley-Davidson Twins 1932-1957 45's - Parkerized
$12.09

Cycle Craft #190 Main Jet - 1988-2006 Keihin CV Carburetor
1 review $5.99

Colony #9526-1 Oil Pump Bypass Valve Plug 1936-1952 Harley-Davidson Big Twin 1937-Up UL/45s - Chrome Plated
$11.96

Colony #9203-3 Clutch Lever Rod Bolt 1952-1964 Harley-Davidson Big Twin OEM #36921-52 - Chrome Plated
$11.96

Colony #9981-8 Front Fork and Back Panel Mounting Button Allen Kit 1987-Up Harley-Davidson FLSTC/FLSTF/FLSTN
$11.90

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 #8769-3 Front Axle Nut & Washer Kit 1972-Up Harley-Davidson Wideglide - Chrome Plated
1 review $11.56

Colony #8768-3 Front Axle Nut & Washer Kit 1973-1991 Harley-Davidson FX/XL - Chrome Plated
$11.56

Colony #8747-12 Oil Pump Mounting Kit 1978-1991 Harley-Davidson Shovelhead/Evo - Chrome Plated
$11.53

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

Colony #2578-4 Top Motor Mount Hardware Kit 1948-1951 Harley-Davidson Big Twins - Parkerized
$11.20

Colony #9935-8 Transmission to Motor Mount Allen Kit 1999-2006 Harley-Davidson Twin Cam/Dyna/FLT 2000-2006 Softail - Chrome Plated
$11.14

Colony #9632-5 Rear Cast Wheel Rotor Allen Screw Kit 1979-1991 Harley-Davidson FX/FL 1979-1996 XL - Chrome Plated
1 review $11.14

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

Colony #3700-5 Ignition Coil Mount Plate 1985-2003 Harley-Davidson XL 1994-2001 Touring 1991-1999 Softail 1991-1994 Dyna - Chrome Plated
1 review $11.00

Colony #2323-6 Air Cleaner Backing Plate Mounting Screws 1966-1977 Harley-Davidson Big Twin 1956-1977 XL
$11.00

Colony #3064-2 Parkerized Fender Brace Bolt Kit 1941-57 Harley Davidson Big Twin and 45 — Colony #3064-2 Fender Brace Bolt Kit 1941-1957 Harley-Davidson Big Twin/45's - Parkerized
$5.45

Colony #3791-4 3/4 OD x 5/16" ID x 1/2" Spacers Harley-Davidson OEM #4 52104-38/3209-38 - 4 Pack - CAD Plated
$10.89

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

Colony #3007-4 Exhaust Spacer 1969-1984 Harley-Davidson FL/FLH 1966-1971 XLH Saddlebag Carrier - CAD Plated
$10.89

Colony #9871-10 License Plate Mounting Kit Flat Head Allen Harley-Davidson - Chrome Plated
$10.76

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

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

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

Colony #2600-2 Brake Caliper Bleed Screws 1983-2004 Harley-Davidson Big Twin 1983-2003 XL - Chrome Plated
4 reviews $10.29

Colony #8146-10 Circuit Breaker & Voltage Regulator Screws 1936-1964 Harley-Davidson OHV Twins - CAD Plated
$10.04

Colony #9671-20 Transmission Side Cover & Clutch Arm Nut Kit Pre-1984 Harley-Davidson 4 Speed - Parkerized
4 reviews $9.96

Colony #8488-10 Cylinder Head Bolt Washers 1948-Up Harley-Davidson OEM #6469 - Chrome Plated
$9.96

Colony #3707-1 Instrument Panel Cover Plate Right Side 1947-1964 Harley-Davidson All Models - CAD Plated
1 review $9.90

Colony #3166-1 Timer Screw 1970-E1978 Harley-Davidson FL 1971-E1978 FX/XL - Zinc Plated
$9.68

Colony #3328-4 Exhaust Port Nuts Harley-Davidson 1986-Up XL 1984-1999 Big Twins 1999-Up Twin Cam - Zinc Plated
14 reviews $4.84

Colony #2927-3 Front Axle Nut and Washer Kit 1973-Up Harley-Davidson FL/XL - CAD Plated
1 review $9.68

Colony #2657-3 Clutch Hub Bearing Plate Springs 1944-1984 Harley-Davidson Big Twins 1944-1973 45's - CAD Plated
$4.84

Colony #9508-4 Handlebar Bolt Kit 1936-1948 Harley-Davidson Big Twin Springers 1940-Up 45 Springers - Parkerized
$9.68

Colony #9527-1 Oil Pump Bypass Valve Plug 1936-1952 Harley-Davidson Big Twin 1937-Up UL/45s - CAD Plated
$9.56

Colony #9524-1 Oil Pump Check Valve Plug 1936-1980 Harley-Davidson Big Twin 1937-Up UL/45s - CAD Plated
$9.56

Colony #8930-8 Linkert Carb Mounting Screws Harley-Davidson OEM #47248-48 - CAD Plated
1 review $9.56

Colony #8200-10 Star Shaped Wheel Hub Outer Cover Screw Kit 1936-1966 Harley-Davidson - Chrome Plated
2 reviews $9.56

Colony #8159-8 Linkert Carb Mounting Screws OEM #27422-39 - CAD Plated
$9.56

Colony #9783-4 Headlight Visor Mounting Allen Bolt Kit 1959-Up Harley-Davidson XL/FX/FXR - Chrome Plated
3 reviews $4.76

Colony #9932-8-P Intake Manifold to Cylinder Smooth Allen Kit 1995-Up Harley-Davidson Big Twin/XL - Chrome Plated
1 review $9.35

Colony #9691-2 Seat Post Rod Lock Nut & Washer 1925-1981 Harley-Davidson All Models (Except FX/XL) - Parkerized
6 reviews $9.35

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 #9962-6 Handlebar Clamp & Gauge Mount Kit 1995-Up Harley-Davidson FX/XL - Chrome Plated
$9.31

Colony #8796-4 Handlebar Clamp Allen Screw Kit 1982-Up Harley-Davidson FX/XL - Chrome Plated
8 reviews $9.31

Colony #9957-2 Air Cleaner Mounting Nut 1983-Up Harley-Davidson Big Twins - Chrome Plated
$9.16

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

Colony #8729-12 Rubberized Cork Pushrod Cover Seals 1957-1979 Harley-Davidson XL 1936-1947 Knucklehead
1 review $9.08

Colony #9915-4 Seat Bracket Button Head Mounting Kit 1987-Up Harley-Davidson Softail/Fat Boy - Chrome Plated
$8.93

Colony #9504-1 Timing & Oil Tank Plug 1938-1951 Harley-Davidson All Models OEM #2326-38 - Parkerized
1 review $8.80

Colony #9404-1 Oversize Harley-Davidson Timing & Oil Tank Plug - CAD Plated
1 review $8.80

Colony #8115-1 Timing Plug/Oil Tank Plug OEM #704 1952-1969 Harley-Davidson FL and XL - CAD Plated
3 reviews $8.80

Colony #9782-4-P Triple Tree Pinch Bolt Set Smooth Chrome Allen Harley FL Wideglide
$8.78

Colony #8441-1 Timing/Oil Plug All Harley-Davidson Timing Plug and 74s Oil Tanks - Chrome Plated
$8.78

Colony #9529-12 Pushrod Cover O-Ring Seal Kit Harley-Davidson Big Twin Evo/Twin Cam/Sportster
3 reviews $8.78

Colony #9304-1 Oversize Harley-Davidson Timing & Oil Tank Plug - Chrome Plated
1 review $8.78

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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