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 #8141-34 Motor Case Kit Stock 1970-1978 Harley-Davidson Shovelhead - CAD Plated
$51.70

Cycle Standard Kickstand Spring 1936-1987 Harley-Davidson Big Twins / Pre 1984 Ironhead Sportster Models - Chrome - OEM #50011-30
44 reviews $9.04

Colony #2212-1 Harley-Davidson Gas Strainer Assembly - 1/4 inch Barbed Fitting - CAD Plated
2 reviews $76.76

Lowbrow Customs Finned Exhaust Flanges 1984-2025 Harley-Davidson Big Twin and 1986-2022 XL (Except Revolution Sportster)
1 review $76.43

Lowbrow Customs Rocker Box Oil Pressure Gauge Adapter Fitting - Brass - 1971 - Up Harley-Davidson Shovelhead, 1971 - 1985 Sportster
8 reviews $30.51

Lowbrow Customs Rocker Box Oil Pressure Gauge Adapter Fitting - Chrome - 1971 - Up Harley-Davidson Shovelhead, 1971 - 1985 Sportster
9 reviews $30.51

Colony #2053-10 Custom Sprocket Hex Bolt/Washer Kit Cast Rear Wheels 1997-1998 Harley-Davidson Big Twins 1997-1998 Dyna/FLT 1991-1999 XL - Chrome Plated
3 reviews $30.42

Colony #1010 Complete Show Bike Kit Allen Hardware 1978-1984 Harley-Davidson Shovelhead - Chrome Plated
2 reviews $150.65

Colony #9418-19 Transmission Mounting Kit 1965-Early 1977 Harley-Davidson Big Twin - Chrome Plated
3 reviews $37.66

Cycle Standard 22mm Petcock Round Body Solid Brass Harley-Davidson Style - Left Side Position
15 reviews $75.14

Trader Cody's Choppers Rear Master Cylinder Mount for Harley-Davidson 4 Speeds - Stainless Steel
$30.00

Gasbox 26 inch Cigar Muffler 1950-1957 Harley-Davidson Panhead - Raw - OEM #65235-50
$150.00

Unity Manufacturing Linkert Intake Leak Tester - 4 Bolt
2 reviews $30.00

Unity Manufacturing Four Speed Clutch Lockup Tool - Stock
3 reviews $50.00

Gasbox Front Exhaust Pipe 1966-1969 Harley-Davidson Shovelhead - Chrome - OEM #65443-66
2 reviews $75.00

Gasbox Strong Arm Top Motor Mount With OEM #71425-77 Ignition Switch Mount 1948-1984 Harley Big Twins
2 reviews $74.95

Fast Eddy Co. No. 32 Tappet Block Alignment Screws - 3 Pack - 1/4-20 Thread
12 reviews $29.95

Cycle Standard Replacement Dished Sprocket - Black - 51 Tooth - 1973-1985 Harley-Davidson Big Twin 1979-81 XL OEM #41470-73
$74.78

Colony #2318-1 Sprocket Shaft Bearing Retainer Installation Tool 1955-1968 Harley-Davidson Big Twin
5 reviews $74.45

Colony #2094-4 Handlebar Riser Allen Bolt Kit 1/2-13 x 2-1/2" Harley-Davidson FLST Models - Chrome Plated
5 reviews $14.89

Lowbrow Customs Radius Breather Bolts for Harley-Davidson Twin Cam - Black ED
16 reviews $49.49

Colony #9885-2 Transmission Fill Plug/Dip Stick - 1987-Up Harley-Davidson Big Twin - Chrome Plated
1 review $21.12

Cycle Standard Rocker Box Covers - Chrome - 1948-65 Harley-Davidson Panhead
2 reviews $147.41

Cycle Standard Clutch Hub Retainer With Rollers 1941-1984 Harley-Davidson Big Twins - OEM #37567-41A
1 review $29.41

S&S Cycle Oil Filter Black '86 & up Sportster and '84 - 99 Big Twin S&S Cycle #31-4101
7 reviews $20.95

James Gaskets Exhaust Gasket/Mounting Kit for Harley-Davidson 1984-2013 Big Twins and 1986-2013 XL
16 reviews $24.43

Drag Specialties Oil Filter for 1980-1985 Harley-Davidson Sportster and Big Twin Models - Black - OEM #63782-80
2 reviews $10.45

Colony #2962-6 Flat Top Brass Grease Fitting Alemite Pre-1938 Harley-Davidson - 3 Pack
$20.85

Cycle Standard Dragton II Air Cleaner - Chrome - Fits Bendix / Zenith, Keihin (except CV) Carbs
15 reviews $72.80

Cycle Standard Heavy Duty Clutch Spring Kit 1968-1984 Harley-Davidson Big Twins
$29.11

Cycle Standard Transmission Mounting Plate 1986-1999 Harley-Davidson Softail - Chrome
$36.27

Cycle Standard Clutch Cable OEM #38606-87A 1987-1994 Harley-Davidson FXR +4 inch Extended
$71.98

The Speed Merchant 39 mm Fork Preload Adjuster - Raw Machined Finish
$143.96 $159.95

Colony #7800-8 Acorn Bolt Transmission Mounting Plate to Frame Kit 1936-1986 Harley-Davidson Big Twins & 4 Speed - Chrome Plated
5 reviews $23.91

Colony #7516-4 Aluminum Pushrods for Hydraulic Lifters - 1966-1983 Harley-Davidson Shovelhead
5 reviews $71.50

Cycle Standard Transmission Sprocket .75" Offset - 23 Tooth - 1991-2006 Harley-Davidson XL 1986-2006 Big Twin 5-Speed
$70.46

Lowbrow Customs Inline Springer Fork Handlebar Fabricator Top Clamp - Raw Steel
3 reviews $140.53

LCFabrications Micro Switch Housing - Clutch Side - Single - Black - 1996-2013 Harley-Davidson
$70.00

Cycle Standard Domed Slim Black Screw-In Harley Style Gas Cap 1996 & up
47 reviews $28.00

LCFabrications "The OG" Clutch Switch Pod Delete - Polished - for Harley-Davidson
8 reviews $35.00

Fast Eddy Co. No. 7 Connecting Rod Alignment Tool 1936-99 Harley Big Twins & All Sportsters
$34.95

S&S Cycle Ignition Rotor - 1970-99 Harley-Davidson Big Twins
$19.95

James Gaskets 5 Speed Transmission End Cover Gasket 1987-2006 Harley-Davidson Big Twin
1 review $6.34

Lowbrow Customs 60 psi Oil Pressure Gauge - White Face
24 reviews $46.49

Lowbrow Customs Premium Stainless Steel Exhaust Clamps 1948-1965 Harley-Davidson Panhead
1 review $27.68

Thrashin Supply Co. ARP Foot Peg Hardware Kit for Harley-Davidson FXR/XL/Dyna
$46.00

James Gaskets Primary Cover & Inspection Cover Gasket Kit With Seals 1984-1986 Harley-Davidson FL/FLH/FX/FXE/FXWG 1984-1988 Softail
$68.87

Colony #3411-15 Hex Bolt & Washer Kit Rear Wheel 1973-1998 Harley-Davidson Big Twin 1979-1990 XL - Zinc Plated
1 review $27.50

Lowbrow Customs Bottom Mount Headlight Bracket - Harley Narrow Glide, Triumph, BSA - Tumbled Stainless
7 reviews $45.76

Lowbrow Customs Motor Company Solid Brass Shifter Peg for Harleys
10 reviews $45.76

Lowbrow Customs Radius Fork Tube Caps - Chrome - 39mm Narrow Glide Front End
6 reviews $45.76

Bates Linkert 3-Bolt Carb Throttle Conversion Kit 1936-39 Harley-Davidson Knucklehead and All Flatheads
2 reviews $68.14

Colony #8204-4 Hydraulic Lifter Converters Eliminate Hydraulic Units 1953-Up Harley-Davidson Big Twins
$34.05

Drag Specialties Clutch Cable OEM #38618-68C Harley-Davidson 4 Speed Big Twin 1968-1986 - 60" Long
$67.79

Colony #3604-52 Horn Mounting Kit 1931-1936 Harley-Davidson VL 1931-1939 RL
$135.00

Prism Supply Co. 3/4"-18 Petcock Fits Early Style Harley-Davidson Tanks - Brass
$134.99

Lowbrow Customs Throttle Housing 1981-1995 Harley Thread-In Single Cable - Brass - 1 inch
5 reviews $134.96

Cycle Standard S&S Super E/G Carburetor Adapter for CV Air Cleaners - Black
$33.53

Cycle Standard Clutch Cable OEM #38606-87A 1987-1994 Harley-Davidson FXR
1 review $66.94

Cycle Standard Clutch Cable OEM #38618-52 1952-1967 Harley-Davidson FL/EL +8 inch Extended
2 reviews $33.39

Cannonball Transmission Base Plate 1936-1985 4 Speed Harley-Davidson Big Twins
$132.13

V-Factor Motorcycle Parts Lever Action Starter Solenoid 1965-1986 Harley-Davidson Big Twin 4 Speed 1984-1988 Softail - Chrome
10 reviews $131.95

Cycle Standard Handlebar Clamp - Finned - Chrome
1 review $32.93

Gasbox Shovelhead Exhaust Flanges - Mild Steel
12 reviews $21.95

Blue Streak High-Performance Condenser - 1970-79 Harley-Davidson
$10.95

Cycle Standard Clutch Friction Disc Set 1991-Up Harley-Davidson Sportster 90-97 Big Twin
2 reviews $130.92

Colony #3537-17 Primary Cover Allen Screw Kit 1971-Up Harley-Davidson Shovelhead & Evolution 4 Speed
5 reviews $16.34

Gasbox Wideglide Headlight Mount 1948 - 1985 Harley-Davidson FLH - Tumbled Stainless
8 reviews $25.95

Lowbrow Customs 39mm Fork Shrouds - Black - 1987-Up - Harley-Davidson Sportsters
53 reviews $128.90

Lowbrow Customs FiltroMax Big Twin Bracket - Tumbled
11 reviews $32.10

Lowbrow Customs PVC Spacer Kit For Extended 35mm Fork Tubes
$14.26

Drag Specialties 30A Circuit Breaker 1970-1999 Harley-Davidson Big Twin/XL 1999 Twin Cam
2 reviews $7.95

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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