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

Colony #9000-4 Evo Acorn Head Bolt Covers 1984-1985 Harley-Davidson FL/FX/X - Chrome Plated
1 review $25.71

Colony #8226-1 Fork Tube Cap/Plug 1948-1977 Harley-Davidson Hydra-Glide - Chrome Plated
$24.26

Colony #7314-9 Rubber Band Type Intake Manifold Conversion Kit 1940-1954 Harley-Davidson Knucklehead/Panhead
$111.89

Colony #8010-10 Front Brake Shackle Rebuilding Kit 1940-1948 Harley-Davidson Big Twins & 45's
$90.88

Colony #7157-20 Heat Treated Acorn Head Bolt Kit - 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$66.63

Colony #7823-12 Pushrod Covers 1948-Early 1979 Harley-Davidson Panhead & Shovelhead - Chrome Plated
4 reviews $64.80

Colony #7133-8 Stock Aluminum Pushrod Covers - 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$80.00

Colony #8777-20 Head Bolt Allen Screw Kit 1948-Up Harley-Davidson Panhead/Shovelhead - Chrome Plated
$57.94

Colony #7517-8 Knucklehead Rocker Arm Cover Nut Strip & Screw Plate Kit 1936-1947 Harley-Davidson Knucklehead
1 review $57.94

Colony #8165-19 Upper And Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin OHV - CAD Plated
3 reviews $52.45

Colony #7824-12 Pushrod Covers 1940-1947 Harley-Davidson Knuckleheads - Chrome Plated
$54.67

Colony #7607-7 Front Rocker Stud Assembly 1930-1948 Harley-Davidson Big Twin Springers
$53.96

Colony #7610-4 Rocker Stud Bushing Set 1930-1948 Harley-Davidson Big Twin Springers
1 review $48.88

Colony #7350-15 Acorn Primary Cover Screw Kit 1971-Up & All 4 Speed Harley-Davidson Big Twins - Chrome Plated
$48.73

Colony #7410-1-US Sprocket Shaft Bearing Retainer with Lip Seal -.002 Undersized Threads 1955-1968 Harley-Davidson 74's
1 review $45.98

Colony #7410-1-OS Sprocket Shaft Bearing Retainer with Lip Seal +.002 Oversized Threads 1955-1968 Harley-Davidson 74's
$45.98

Colony #8202-18 Rear Fender Mounting Kit 1936-1957 Harley-Davidson Big Twins - CAD Plated
$42.00

Colony #7627-4 Weld-In Aluminum Intake Manifold Nipples 1948-1954 Harley-Davidson Panhead
$36.94

Colony #7519-4 Aluminum Alloy Tubular Pushrods 1948-1952 61c.i. Harley-Davidson Panhead
$55.00

Colony #7506-4 Aluminum Alloy Tubular Pushrods 1948-1952 Harley-Davidson Panhead using 1966-Up Shovel Top End
1 review $55.00

Colony #7146-12 Acorn Head Primary Cover Screw Kit - 1965-1970 Harley-Davidson 74's - Chrome Plated
3 reviews $36.20

Colony #7129-12 Acorn Head Timing Cover Set - 1936-1969 Harley-Davidson 74's/61 OHV - Chrome Plated
$36.20

Colony #7710-18 Head Bolt Washer Kit 1940-1947 Harley-Davidson 45's/75's/80's with Aluminum Heads - CAD Plated
1 review $33.31

Colony #7622-1 Fork Tube Bolt 1973-Mid 1985 Harley-Davidson XL/FX - Chrome Plated
1 review $32.60

Colony #7620-1 Fork Tube Cap/Bolt/Breather 1947-1977 Harley-Davidson Glide Front Ends - Chrome Plated
$21.73

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

Colony #7613-2 Spring Retainer & Acorn Nut Set 1936-1948 Harley-Davidson Big Twin Springers 1936-1952 45's
$20.65

Colony #8101-6 Swingarm End Cover Kit 1973-1984 Harley-Davidson FX/FL 1979-1992 XL 1981-1987 FXR - Chrome Plated
1 review $21.12

Colony #8203-6 Front Fender Mounting Kit 1936-1948 Harley-Davidson Springers - CAD Plated
$20.85

Colony #7705-4 Knucklehead Rocker Box Drain Tube Fitting Kit
$20.31

Colony #7804-6 Spark Plug Cable Packing Nut Kit 1927-1959 Harley-Davidson Coils
1 review $19.93

Colony #7104-2 Brass Intake Manifold Seals 1940-54 Harley-Davidson OHV 74's/61's 1953-56 K/KH
$20.00

Colony #7820-4 Rear Brake Cross Shaft Nut & Lock Kit 1930-1957 Harley-Davidson Big Twins - CAD Plated
$17.92

Colony #7826-1 Motor Sprocket Nut 7/8-14 Threads 1955-1976 Harley-Davidson Big Twin
1 review $20.90

Colony #7816-1 Acorn Motor Sprocket Nut 1955-1976 Harley-Davidson Big Twin - Chrome Plated
1 review $16.73

Colony #7351-2 Transmission Pug Standard Size 1940-1984 Harley-Davidson 74's
$15.94

Colony #7626-2 Handlebar End Nuts 1937-1948 Harley-Davidson All Models 1940-Up
$15.73

Colony #7111-2 Upper Spring Retainers - 1936-1948 Harley-Davidson Big Twin Spiringer 1932-52 45's 1953-54 Servicar - Chrome Plated
$15.27

Colony #8163-3 Front Axle Nut Kit 1946-1971 Harley-Davidson Big Twins - CAD Plated
$14.74

Colony #8145-10 Circuit Breaker & Voltage Regulator Screws 1936-1964 Harley-Davidson OHV Twins - Chrome Plated
1 review $14.89

Colony #8102-16 Lifter Base Screw Kit 1936-1953 Harley-Davidson Big Twin & 1937-1973 45's - Chrome Plated
$19.25

Colony #7612-3 Oil Line/Vent Line Fittings Pre-1965 Harley-Davidson Big Twins - CAD Plated
2 reviews $13.94

Colony #8009-2 Front Fender Brace Clip Lock Kit 1934-1948 Harley-Davidson Big Twins & 1940-1954 45's
$13.40

Colony #7801-2 Gas Tank Shut Off Operating Knob Extension 1940-65 Harley-Davidson
2 reviews $11.96

Colony #7101-1 Motor Sprocket Nut 11/16-18 Thread - 1930-1954 Harley-Davidson Big Twins
$15.40

Colony #7107-1 Acorn Style Sprocket Nut - 1936-1954 Harley-Davidson Big Twins - Chrome Plated
2 reviews $11.56

Colony #7616-1 Transmission Filler Plug 1936-Up Harley-Davidsons - CAD Plated
$13.20

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

Colony #7501-1 Oversize Timing Plug/Oil Tank Plug 11/16-16 Thread - Chrome Plated
$10.04

Colony #7106-1 Timing/Oil Plug - Harley-Davidson '74 Oil Tanks with 5/8-18 Thread - Chrome Plated
1 review $10.04

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

Colony #8114-1 Timing Plug/Oil Tank Plug OEM #704 1952-1969 Harley-Davidson FL and XL -Chrome Plated
1 review $8.78

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

Colony #8109-1 Long Oil Pump Nut Pre-1967 Harley-Davidson Big Twins - CAD Plated
$5.18

Colony #8007-2 Intake Manifold Nuts 1936-1939 61 c.i. Knucklehead & 1930-1948 Sidevalve (Except 45's) - CAD Plated
$29.34

Colony #8205-8 Saddle Bag Mounting Kit 1934-1957 Harley-Davidson - Chrome - Chrome Plated
2 reviews $28.42

Colony #7813-8 High Crown Acorn Cylinder Base Nut Set 1978-1984 Harley-Davidson Shovelhead - Chrome Plated
2 reviews $29.34

Colony #7827-12 Oil Pump Acorn Screw Kit 1978-1991 Harley-Davidson Big Twins - Chrome Plated
$25.71

Colony #7417-13 Oil Pump Acorn Nut Screw & Washer Kit 1968-1977 Harley-Davidson Big Twins - Chrome Plated
1 review $25.71

Colony #7102-12 Acorn Head Rocker Box Bolt Set - 1936-1947 Harley-Davidson Knucklehead - Chrome Plated
$26.44

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

Colony #7715-6 Dash Plate Mounting Kit All 1936-1946 Harley-Davidson Big Twins
$29.37

Colony #7611-2 Rocker Busing Installation Tool 1930-1948 Harley-Davidson Big Twins
3 reviews $22.00

Colony #8302 PARK Complete Stock Hardware Kit - 1948-1957 Harley-Davidson Panhead - Parkerized
1 review $216.35

Gasbox Shovelhead Bolt On Sissy Bar - 4 Speed Frame - 1965 - 1984
6 reviews $134.95

Led Sled Customs Derby Oil Tank for Harley-Davidson Choppers
5 reviews $199.95

Bad&G Customs Harley Dyna Battery Cover Bag - Bolt-On Storage for 2006 and Up Models
23 reviews $89.99

Mullins Chain Drive 39mm Super Narrow Triple Trees Set
18 reviews $500.00

Mullins Chain Drive Kicker Pedal
4 reviews $125.00

Colony #8306 CHR Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Aluminum Head - Chrome Plated
$426.57

Colony #8305 CAD Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Cast Iron Head - CAD Plated
$305.07

Colony #9506-4 Rear Chain Adjusters - 1932-1973 Harley-Davidson Servi-car - Parkerized
$21.90

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.