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

Cycle Standard Throttle Cable OEM #56356-92 Harley Dyna 1992-1995 +4 inch Extended
$25.28

Colony #9803-4 Triple Tree Pinch Bolts Kit Harley-Davidson FL and Wideglide - Chrome Plated
$8.36

Cycle Standard Neutral Indicator Light for Harley-Davidson OEM #68024-92A
7 reviews $12.53

Unity Manufacturing Splined Motor Turning Tool - 1954-1999 Harley-Davidson Big Twins
$25.00

Colony #9722-18 Footboard Hinge Bolt Buddy Footrest Bolt Kit 1941-1964 Harley-Davidson All Models - Parkerized
$25.00

Colony #3068-30 Primary Cover Screw Kit 1956-1964 Harley-Davidson Big Twins - CAD Plated
1 review $25.00

Colony #8156-30 Primary Cover Screw Kit 1936-1964 Harley-Davidson Big Twins - CAD Plated
$25.00

Colony #8860-8 Cylinder Base Stud Spacer 1978-1984 Harley-Davidson Shovelhead OEM #16836-78 - Chrome Plated
1 review $24.98

Colony #9601-10 Inner Primary Cover Rear Bolt Kit 1936-1964 Harley-Davidson Big Twin - Parkerized
3 reviews $12.45

Colony #3557-1 Sprocket Shaft Bearing Retainer Seal 1955-1968 Harley-Davidson 74's
$8.25

Colony #3350-7 Clutch Release Stud Bushings 1936-1984 Harley-Davidson Big Twins - Parkerized
1 review $24.75

Colony #8736-24 Valve Cover Screws 1954-1965 Harley-Davidson Panhead With Steel D-Rings - Chrome Plated
$24.71

Colony #8493-2 Oil Tank Drain Plug 1981-Up Harley-Davidson Big Twin - Chrome Plated
1 review $12.34

#3104-14-P Transmission Side Cover Chrome Polished Allen Kit Harley Touring 2017-up — Colony #3104-14-P Transmission Side Cover Polished Allen Kit 2017-Up Harley-Davidson Touring - Chrome Plated
$24.48

Cycle Standard 41mm Triple Lip Fork Seal Rebuild Kit - 1949-1977 Harley-Davidson FL
$24.45

Colony #2084-2 Seat Post Bushings 1958-1984 Harley-Davidson Big Twins OEM #47094-58
1 review $24.37

Colony #8742-14 Oil Pump Mounting Kit 1967-1977 Harley-Davidson Big Twins - Chrome Plated
$24.37

Colony #3284-50 Flat Washers Harley-Davidson All FL/FX/XL OEM #6099 - Zinc 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 #2990-2 Generator Screw Kit CAD Special 5/16 inch case holes Harley Big Twins 36-57 — Colony #2990-2 Special Generator Screw Kit 5/16 inch Case Holes 1936-1957 Harley-Davidson Big Twins - CAD Plated
2 reviews $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 #9910-4 Fork Slider Drain Screws 1973-Up Harley-Davidson XL/FXR - Chrome Plated
5 reviews $4.84

Colony #8149-12 Timing Cover Screw Kit 1936-1969 Harley-Davidson Big Twins - Chrome Plated
1 review $24.20

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

Colony #3674-10 Sprocket Bolts Knurled 1979-1990 Harley-Davidson XL 1993-1998 Big Twins - Chrome Plated
$24.01

James Gaskets Kicker Cover Gasket 1936-1986 Harley-Davidson Big Twin 4 Speeds OEM# 3329536
$4.00

Colony #9873-16 Inner Primary Mounting Kit 1994-1999 Harley-Davidson Softail 1994-1998 Dyna Glide - CAD Plated
1 review $24.00

Colony #7803-11 Acorn Nut Kickstand Mounting Kit 1936-1986 Big Twin 4 Speeds (Except Softail) - Chrome Plated
5 reviews $23.91

Colony #7619-1 Custom Stem Nut 1971-Up Harley-Davidson 1979-Up Sportster - Chrome Plated
1 review $23.91

Drag Specialties 40A Circuit Breaker 1970-1999 Harley-Davidson Big Twin/XL 1999 Twin Cam
$7.95

Colony #8761-7 Timing Cover Knurled Allen Screw Kit 1970-1992 Harley-Davidson Shovelhead/Evo - Chrome Plated
2 reviews $11.90

Cycle Standard Screw-In Harley Stock Style Non-Vented Gas Cap - Left Side - 1996 & up - Black
$23.51

Colony #2921-2 Spring Retainer & Acorn Nut Set 1936-1948 Harley-Davidson Big Twin Springers 1936-1952 45s 1953-1954 Servi-car - Chrome Plated
2 reviews $23.38

Colony #9919-3 Transmission Bottom Stud Kit 1929-Up Harley-Davidson 45's
$23.18

Colony #7716-2 Dash Cover Mounting Center Screw & Stud Kit All 1947-1967 Harley-Davidson
2 reviews $23.18

Colony #9103-4 Shift Rod End Bolt Kit 1936-1954 Harley-Davidson Handshift 1951-1964 Foot Shift - Chrome Plated
$11.56

Colony #8931-16-P Rocker Cover Smooth Allen Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - Chrome Plated
$23.01

Colony #2280-16 Rocker Cover 12 Point Screw Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - Chrome Plated
$23.01

Colony #3763-5 Generator Strap Rebuild Kit 1930-1957 Harley-Davidson 45's/VL/Knucklehead/Panhead
$23.00

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 2004-2006 Harley-Davidson XL 1999-2008 FLH/FLT
$22.99

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

Colony #2953-5 Carburetor Support Bracket 1954-E1955 Harley-Davidson OHV Big Twins - Parkerized
$22.50

Colony #3751-1 Intake Manifold Conversion Nipple 1940-Up Manifold On 1936-1939 Harley-Davidson OHV
$22.45

Colony #3140-4 Oversize 1/2-13 Transmission Case Bottom Stud Kit 1915-1936 Harley-Davidson Twins
$22.45

Colony #9655-4 Extra Oversize Transmission Case Bottom Stud Kit 1936-1983 Harley-Davidson Big Twins - Parkerized
$22.45

Colony #8762-17 Primary Cover Allen Head Screw Kit 1971-Up Harley-Davidson Shovelhead/Evo 4 Speed - Chrome Plated
2 reviews $22.34

The Rough Trade 2" Wrench for Harley-Davidson Small Port Knucklehead & Big Twin Flathead Intake
1 review $22.31

The Rough Trade Valve Spring Cover Adjustment Wrench Set for Harley-Davidson Big Twin
$22.31

The Rough Trade Axle Wrench for Harley-Davidson Big Twin
$22.31

Colony #9977-1 Fork Stem Cap 1986-Up Harley-Davidson FLST/FXR/FXD/XL - Chrome Plated
1 review $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 #8849-2 Circuit Breaker Post Rebuild Kit 1948-1969 Harley-Davidson FL/XL/K/45's
$11.14

Colony #3768-5 Rubber Grommets Harley-Davidson OEM #11410 - 5 Pack
1 review $11.00

Colony #3266-5 Rear Axle Spring Clip Set 1991-Up Harley-Davidson FL/FX/XL - Zinc Plated
5 reviews $11.00

Colony #9669-9 Tool Box Mounting Kit 1935-1954 Harley-Davidson All Models - Parkerized
3 reviews $22.00

Colony #3363-1 Carburetor Choke Rod 1941-1947 Harley-Davidson OHV Big Twins - Parkerized
$21.99

Fast Eddy Co. No. 5 Cam Gauge Pins .108" 1990-1999 Harley Big Twins
2 reviews $39.95

Colony #9018-5 Hand Shifter Lever Stud and Bushing Kit 1936-1954 Harley-Davidsons - Chrome Plated
$21.73

Colony #7017-16 High Crown Acorn Cylinder Base Nut Set - 1930-1977 Harley-Davidson 74's - Chrome Plated
$21.66

Colony #8820-9 Transmission Side Cover Allen Screw Kit 1936-Up Harley-Davidson Big Twin 4 Speeds - Chrome Plated
$21.60

Colony #2528-10-P Gas Tank Mounting Smooth Allen Kit 1990-1995 Harley-Davidson Softail - Chrome Plated
$21.51

Colony #9621-12 Timing Cover Screw Kit 1936-1969 Harley-Davidson Big Twins
3 reviews $21.30

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

Colony #9630-2 Front Brake Cable Adjusting Screw 1941-1948 Harley-Davidson Big Twin 1941-1957 45 Servicar - Parkerized
$21.12

Gasbox Axle Plate Threaded Bungs for 1936 - 1957 Harley-Davidson Big Twin Rigid Frames
2 reviews $20.99

Colony #8104-16 Cylinder Base Nuts 1930-1978 Harley-Davidson Big Twins - Chrome Plated
$20.99

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

Colony #2875-1 Rear Axle Spacer 1967-1972 Harley-Davidson FL/FLH - Chrome Plated
$20.90

Colony #2496-2 Tappet Oil Screen and Spring 1966-1969 Harley-Davidson Shovelhead
1 review $6.96

Colony #9678-2 Generator Screws 1930-1948 Harley-Davidson Big Twin Sidevalve - Parkerized
$10.37

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.