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

James Gaskets 4 Speed Transmission End Cover Gasket 1936-1986 Harley-Davidson Big Twin
1 review $6.46

Cycle Standard Tail Light Screws for 1973-Up Harley-Davidsons - Replaces OEM #68026-73
4 reviews $19.22

Colony #2943-1 Boot Guard 1936-Up Harley-Davidson Knucklehead/Flathead - Black Powder Coated
$95.70

Colony #9521-22 Upper & Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - Chrome Plated
$47.80

FNA Custom Cycle Carb Arm Support Bracket for Harley-Davidson Ironheads and Shovelheads - Tumbled
$95.00

Prism Supply Co. Jockey Shifter - Long - Harley-Davidson Big Twin
4 reviews $94.99

Cycle Standard Drilled Black Brake & Clutch Lever Set for Harley 96-03 Sportster and 96-06 Big Twins
23 reviews $47.09

Drag Specialties Organic Rear Brake Pads L1987-99 H-D XL 91-98 Dyna Glide 84-97 FXR 84-E87 FXST/FLST
$31.19

Thrashin Supply Co. ARP Foot Peg Hardware Kit for Harley-Davidson FXR/XL/Dyna
$45.95

Drag Specialties XLX Style Front Fender 1999-05 Harley-Davidson Dyna 86-Up XL 11-Up 883L/1200C/1200CX 14-20 1200T
2 reviews $91.62

Cycle Standard S&S Super E/G Carburetor Adapter for CV Air Cleaners - Chrome
1 review $30.48

Cycle Standard Bungee Nuts - 5/16-18
10 reviews $11.43

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 #8604-16 Lifter Base Screw Kit Hex Head 1954-1974 Harley-Davidson Big Twin - Chrome Plated
3 reviews $22.78

Colony #9100-8 Cylinder Base Nut Set 1978-1984 Harley-Davidson Shovelhead OEM #16838-78 - Chrome Plated
2 reviews $22.75

James Gaskets Replacement Float Bowl O-ring for 1992-2006 Harley-Davidson CV Carbs
$6.96

Martian Machine Sideways Can Cast Aluminum Points Cover - Horizontal
1 review $45.00

Martian Machine Sideways Can Cast Aluminum Points Cover - Veritcal
$45.00

Martian Machine Can Cast Aluminum Points Cover - Veritcal
2 reviews $45.00

Martian Machine Spiral Cast Aluminum Points Cover - Veritcal
1 review $45.00

Unity Manufacturing Linkert Intake Leak Tester - 4 Bolt
1 review $30.00

Unity Manufacturing Two Bolt Intake Leak Tester
4 reviews $30.00

Gasbox Front Pipe to Frame Clamp Set for 1958 - 1969 Harley-Davidson FL Models - Parkerized - OEM #65513-58, 65512-37A
4 reviews $22.50

Fast Eddy Co. No. 33 Tappet Block Alignment Screws - 3 Pack - 1/4-24 Thread
4 reviews $29.95

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

Colony #9608-10 Hex Bolt & Washer Kit Rear Wheel 1973-1992 Harley-Davidson Big Twin 1979-1990 XL - Chrome Plated
3 reviews $29.44

Colony #3178-2 Piston Lock Ring Tool 1932-1973 Harley-Davidson Big Twins - Parkerized
2 reviews $44.00

Colony #7825-20 Grade 8 Head Bolt Kit 1948-Up Harley-Davidson Panhead/Shovelhead - CAD Plated
$43.99

Gasbox Tumbled Stainless Steel Points Cover for Harley-Davidson Sportsters and 1970 - 1999 Big Twins
3 reviews $21.95

Gasbox S&S Carburetor Support Bracket - Harley-Davidson Evo Big Twin and Strokers - Tumbled Stainless
9 reviews $21.95

Cycle Standard Throttle Cable OEM #56356-92 Harley Dyna 1992-1995
2 reviews $21.91

Drag Specialties Aramid Fiber Clutch Plate Set L1984-1989 Harley-Davidson Big Twins
$87.50

Colony #3597-1 Spark Control Cable Clamp 1949-1964 Harley-Davidson Big Twins
$7.26

Colony #8154-2 Generator Mounting Screws 1958-1969 Harley-Davidson Big Twins - CAD Plated
2 reviews $9.56

Cycle Standard 39mm Fork Seal Rebuild Kit - Showa Forks - 1988-2020 Harley-Davidson XL 1988-94 FXR 1987-2005 Dyna Models
6 reviews $14.25

Gasbox Exhaust Port Clamps 1950 - 1965 Harley-Davidson Panhead - Stainless Steel OEM #65519-48 HDW
5 reviews $28.50

Colony #8150-12 Timing Cover Screw Kit 1936-1969 Harley-Davidson Big Twins - CAD Plated
$21.30

Prism Supply Co. Motor Mount Mid-Pegs for Harley-Davidson Big Twins - Stainless Steel
$84.99

Prism Supply Co. Speedometer Cable Eliminator for 1936-1984 Harley-Davidson Big Twin 4 Speed
$16.99

Cycle Standard Pop-Up Gas Cap Large Diameter - Black - Dummy - 1996 - Up Harley-Davidson
1 review $42.35

Colony #8748-12 Transmission Top Cover Allen Screw 1965-1978 Harley-Davidson Big Twin - Chrome Plated
2 reviews $27.83

V-Twin Manufacturing Polished Shifter Rod 1991-2005 Harley-Davidson FXD
$41.71

Lowbrow Customs Banded Screw-In Gas Cap for Harley-Davidson 1982-1995 / Modern Triumph Bonneville T100 / T120, Scrambler, Thruxton - Brass
6 reviews $83.23

Lowbrow Customs Fork Nut Wrench Harley-Davidson Big Twin & Sportster Fork Tube Caps
9 reviews $27.74

Lowbrow Customs Black Solo Seat Bolt-On Spring Mounts for Harley-Davidson Swingarm Frames 1958 - 1985
5 reviews $41.60

Lowbrow Customs Motor Company Solid Brass Shifter Peg for Harleys
9 reviews $41.60

Colony #3081-7 Seat Spring Upper and Lower Set 1936-1957 Harley-Davidson Rigid Big Twin
3 reviews $82.50

Motone Screw-In Billet Gas Cap for 1996 & later Harley-Davidson - Vented - Black
$82.47 $102.31

Motone Screw-In Billet Gas Cap for 1996 & later Harley-Davidson - Vented - Satin Brass
$82.47 $102.22

Drag Specialties Swing Arm Bearing Kit 1958-86 Harley-Davidson FX/FXWG/FLH (except Softail, FXR, FLT)
1 review $40.74

Colony #3678-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Parkerized
$40.70

Colony #8233-1 Fork Tube Bolt 1978-Up Harley-Davidson Wide Glide - Chrome Plated
1 review $20.31

Colony #3193-2 Primary Drain Plug 2004-2006 Harley-Davidson Softail - Zinc Plated
9 reviews $11.50

The Rough Trade Valve Spring Cover Adjustment Wrench Set for Harley-Davidson Big Twin
$20.00

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

Colony #2912-14 Footboard Mounting Kit Parkerized Harley Davidson Big Twins 1958-64 — Colony #2912-14 Footboard Mounting Kit 1958-1964 Harley-Davidson Big Twins - Parkerized
$79.75

Colony #9659-1 Gas Strainer Assembly 1932-1938 Harley-Davidson Twins - Nickle Plated
1 review $79.66

Colony #3449-10 Disc Rear Rotor To Hub Screw & Nut Kit 1979-1991 Harley-Davidson FX/XL 1981-1984 FL Spoke or Cast Wheel - Zinc Plated
4 reviews $15.73

Cometic Gasket Inc. Cam Change Gasket Kit - 1970-92 Harley-Davidson Big Twin
$26.20

Drag Specialties SAE 80W-90 High-Performance Mineral Transmission Oil for Big Twins - 1 quart
$13.08

Colony #9977-1 Fork Stem Cap 1986-Up Harley-Davidson FLST/FXR/FXD/XL - Chrome Plated
1 review $11.14

Cannonball Kicker Clutch/Housing Puller for Cannonball StealthStarter Kick Drive Systems
$38.56

Colony #2851-1 Wheel Bearing Locknut Tool Harley-Davidson XL/FL/FLH/FX/Sidecar/Servi-car
5 reviews $38.50

Cycle Standard Chrome Headlight Eyebrow Visor for Harley Sportster FX FX FXR - with Indicator Light Holes
$38.41

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

Colony #9662-1 Gas Strainer Assembly 1950-1965 Harley-Davidson Big Twins - CAD Plated
2 reviews $76.76

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

Cycle Standard Transmission Sprocket Spacer OEM# 33344-94
$7.67

Cycle Standard Handlebar Clamp - Smooth - Black
$25.56

Colony #8014-2 Rear Chain Adjuster Screws - 1936-1972 Harley-Davidson Knucklehead/Panhead/Shovelhead - CAD Plated
2 reviews $15.29

Cycle Standard Oil Filter for Harley-Davidson Sportster and Big Twin Models - Chrome - OEM #63782-80
3 reviews $15.26

Colony #8012-2 Intake Manifold Nuts 1930-1948 Harley-Davidson 74 & 80 c.i. Flathead 1936-1939 61 c.i. OHV & 1940-1946 WLD - Chrome Plated
$38.03

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.