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

Cycle Standard Harley-Davidson Shifter Peg - Replaces OEM #34611-65
56 reviews $7.57

Burly Brand Ape Hanger Handlebars - 1 inch - 12 inch Rise - Chrome

2 $165.56 $183.95

Performance Machine Classic 5 Spoke One-Piece Brake Rotor - 11.5 inch - Rear
$164.95

Cycle Standard Handlebar Clamp - Finned - Chrome
$32.93

Lowbrow Customs Finned Thread-In Gas Cap for Harley-Davidson 1996 & later - Polished
35 reviews $54.87

Colony #3157-11 Buddy Seat Auxillary Spring Bolt Kit 1936-69 Harley Davidson — Colony #3157-11 Buddy Seat Auxillary Spring Bolt Kit 1936-1969 Harley-Davidson Big Twins - Parkerized
2 reviews $20.57

Cycle Standard 3 Hole Chrome Derby Cover for 1970-1998 Harley-Davidson Big Twins Replaces OEM #60668-84A 253952-84T
3 reviews $27.13

EBC Brakes Sintered Front Brake Pads 1984-99 H-D FLT/FLHT/FLHR/FLTR 84-99 FXST/FLST 88-06 FXSTS 97-03 FLSTS 05-07 FLSTSC 08-11 FLSTSB
$54.14 $56.31

James Gaskets Top End Gasket Kit 1948-1965 Harley-Davidson Panhead
2 reviews $40.59

Drag Specialties 6-1/2 inch Pullback Handlebar Riser Set - Chrome
$162.13

Cycle Standard Black 6V Square Coil 1948-60 Harley-Davidson Big Twins
$80.82

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

Lowbrow Customs Banded Screw-In Gas Cap for Harley-Davidson 1996 & later - Aluminum
10 reviews $53.41

Gasbox Front Pipe Exhaust Clamp 2 Piece Set 1937-1969 Harley-Davidson EL FL - Parkerized OEM #65512-37
3 reviews $20.00

Solid Custom Rippled Screw-In Billet Gas Cap for 1996 & later Harley-Davidson - Vented - Black
2 reviews $79.99 $99.99

Prism Supply Co. Kickstand Mounting Bracket for Harley-Davidson Big Twin Frames - Stainless Steel
$39.99

The Speed Merchant Speedpegs Foot Pegs - Black
$157.46 $174.95

Colony #2313-19 Upper and Lower Motor Mount Bolt Kit 1936-1969 Harley-Davidson Big Twin - Parkerized
2 reviews $52.45

PanAm Oils Inc. Oil Pressure Gauge 0-60 psi - Chrome
10 reviews $39.18

Colony #9421-21 Transmission Mounting Kit Late 1977-1986 Harley-Davidson Big Twin - Zinc Plated
$31.14

Lowbrow Customs Spare Parts Book for 1958-1968 Harley-Davidson Panhead Shovelhead
15 reviews $38.83

Lowbrow Customs Spare Parts Book for 1936-1948 Harley-Davidson Knucklehead and Flathead
8 reviews $38.83

Prism Supply Co. 3/4"-18 Petcock Fits Early Style Harley-Davidson Tanks - Stainless Steel
$155.00

Bates 1/4" NPT Petcock Conversion Kit 1940-65 H-D Big Twins and 45”/750 cc Sidevalves - CAD Plated
5 reviews $77.49

Colony #7137-22 High Crown Acorn Rocker Box Bolt Kit - 1966-1984 Harley-Davidson Shovelhead - Chrome Plated
4 reviews $51.43

Colony #3254-6 Exhaust Pipe Locking Bolt Mounting Kit 1966-1984 Harley-Davidson Shovelheads - Zinc Plated
14 reviews $22.00

Colony #8221-20 Head Bolt Kit 1948-Up Harley-Davidson Panhead/Shovelhead - Chrome Plated
8 reviews $76.76

The Speed Merchant 39 mm Fork Preload Adjuster - Gold Finish
$152.96 $169.95

Colony #9629-2 Rear Chain Adjusters - 1936-1972 Harley-Davidsons Knucklehead/Panhead/Shovelhead - Parkerized
4 reviews $15.29

Lowbrow Customs Fork Nut Wrench Harley-Davidson Big Twin & Sportster Fork Tube Caps
9 reviews $30.51

Cycle Standard Throttle Idle Cable OEM #56355-96A Harley Dyna 1996-2008 - Blacked Out
2 reviews $25.35 $36.21

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

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 1982-1994 Harley FXR and Gasbox Ironhead & Big Twin Top Motor Mounts
$25.29

Cycle Standard Exhaust Port Gasket 1984-2024 Harley-Davidson Big Twins 1986-2022 XL OEM# 65324-83 - 5 Pack
$30.25

Cycle Standard Replacement Lower 39mm Damper Springs 1987-Up Harley-Davidson XL 1991-2005 FXD 1987-1994 FXR OEM# 45374-87
$18.89

Colony #7508-20 Upper Pushrod Cover Kit 1940-1947 Harley-Davidson Knucklehead Shovelhead and Evo - Chrome Plated
3 reviews $50.08

Cycle Standard Replacement Dished Sprocket - Chrome - 48 Tooth - 1973-1985 Harley-Davidson Big Twin 1979-81 XL OEM #41470-73
2 reviews $75.02

Cycle Standard Replacement Dished Sprocket - Chrome - 51 Tooth - 1973-84 Harley-Davidson Big Twin 1979-81 XL OEM #41470-73
1 review $75.02

Unity Manufacturing Two Bolt Intake Leak Tester
5 reviews $30.00

Colony #9637-13 Transmission Kicker Cover Stud Kit 1936-1984 Harley-Davidson Big Twin - Parkerized
3 reviews $25.00

Gasbox Peg Mount License Plate Bracket - 1984-2017 Harley-Davidson Softail - Vertical or Horizontal
9 reviews $49.95

Colony #2314-36 Transmission Mounting Kit 1936-1964 Harley-Davidson Big Twin - Parkerized
3 reviews $49.41

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

Cycle Standard Handlebar Clamp - Smooth - Chrome
1 review $24.48

Drag Specialties Clutch Cable OEM #38606-87A Harley-Davidson FXST 1987-1999
$73.09

Lowbrow Customs Motor Company Aluminum Shifter Peg for Harleys
23 reviews $20.78

Colony #8728-12 Rubberized Cork Pushrod Cover Seals Pre-1979 Harley-Davidson Panhead/Shovelhead
20 reviews $9.08

Cycle Standard 39mm Fork Boot Gaiter Set for Harley Sportster's Front Forks
32 reviews $48.08

Cycle Standard Transmission Mounting Plate 1986-1999 Harley-Davidson Softail - Black
1 review $36.04

Unity Manufacturing Two Bolt Carburetor Support Bracket - Stainless Steel
4 reviews $18.00

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

Cycle Standard 41mm Fork Seal Rebuild Kit - 1984-2013 Harley-Davidson FLT 1984-86 FXWG 1984-17 Softail 2012-16 FLD
1 review $20.54

Cycle Standard Universal Fork Boot Gaiter Set for 41mm Front Forks
11 reviews $47.80

James Gaskets Wheel Bearing Oil Seals for Big Twin and XL Models - Front or Rear Wheel
19 reviews $6.49

Colony #2322-11 Rocker Arm Cover Stud Kit 1966-1984 Harley-Davidson Shovelhead
4 reviews $47.38

James Gaskets Fork Seal 49MM Rebuild Kit 2006-Up Harley-Davidson FXD/FLD
4 reviews $28.29

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

Colony #2091-12 Replacement Pushrod Covers Late 1979-1984 Harley-Davidson Shovelhead - Chrome Plated
2 reviews $70.39

Colony #9609-15 Hex Bolt & Washer Kit Rear Wheel 1973-1998 Harley-Davidson Big Twin 1979-1990 XL - Chrome Plated
$35.19

Cycle Standard Transmission Sprocket .5" Offset - 22 Tooth - 1991-2006 Harley-Davidson XL 1986-2006 Big Twin 5-Speed
$70.34

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

Gasbox Axle Plate License Plate Bracket for 1936 - 1957 Harley-Davidson Big Twin Rigid Frames
4 reviews $69.95

Colony #7500-2 Oversize Timing Plug/Oil Tank Plug & Tap Kit 11/16-16 Thread - Chrome Plated
$46.35

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

Cycle Standard Popsicle Kicker Pedal with Rubber for 1977 & earlier Harley-Davidson Kicker Arms Replaces OEM #33175-16A
18 reviews $27.65

Colony #2425-2 Clutch Pushrod Adjusting Screw Locknut 1941-1984 Harley-Davidson Big Twin - Parkerized
1 review $15.31

Lowbrow Customs Air Cleaner Backplate Gasket for Super E / G Carburetor
45 reviews $2.22

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

Mooneyes Finned Points Cover for Harley-Davdison 1999 & Up Twin Cam
4 reviews $67.67

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

Cycle Standard Bayonet / Cam Harley Style Vented 2.5" Gas Cap - Gloss Black
7 reviews $33.70

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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