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 #8138-34 Motor Case Kit Stock 1965-1969 Harley-Davidson Big Twin - CAD Plated
$51.70

Colony #8133-34 Motor Case Kit Acorn Head 1948-1964 Harley-Davidson Panhead - Chrome Plated
$63.61

Colony #8130-34 Motor Case Kit Acorn Head 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$63.61

Colony #8128-34 Motor Case Kit Stock 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$58.30

Colony #8127-34 Motor Case Kit Acorn Head 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$63.61

Colony #8206-9 Tool Box Mounting Kit 1935-1954 Harley-Davidson - CAD Plated
$22.00

Colony #8116-1 Motor Case Drain Plug/Oil Pump Body Plug 1911-1970 Harley-Davidson Big Twin Cases/1968-1984 Oil Pump Body - Chrome Plated
$6.60

Colony #8108-1 Long Oil Pump Nut Pre-1967 Harley-Davidson Big Twins - Chrome Plated
$7.17

Colony #8103-16 Lifter Base Screw Kit 1936-1953 Harley-Davidson Big Twin & 1937-1973 45's - CAD Plated
$16.35

Colony #7713-20 Head Bolt Set CAD Plated 1936-1939 Harley-Davidson Knucklehead - CAD Plated
$64.09

Colony #7712-36 Head Bolt Set 1940-Up Harley-Davidson 45's 1930-1947 Flathead 74's/80's with Iron Heads - CAD Plated
$97.04

Colony #7711-18 Head Bolt Set CAD Plated 1940-1947 Harley-Davidson Flathead 74's/80's with Aluminum Heads - CAD Plated
$98.48

Colony #7628-8 Lifer Base Screw Kit 1976-Up Harley-Davidson 74's - Chrome Plated
$25.71

Colony #7602-11 Transmission Mounting Hardware Kit 1936-1964 Harley-Davidson Big Twins - Chrome Plated
$31.28

Colony #7509-20 Upper Pushrod Cover Kit 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$50.08

Colony #7414-20 Acorn Primary Cover Screw Kit 1936-1969 Harley-Davidson Big Twin With Steel Primary Cover- Chrome Plated
$60.91

Colony #7412-24 Acorn Rocker Arm Cover Screw Kit All Harley-Davidson Panheads- Chrome Plated
$60.91

Colony #7402-7 Acorn Head Timing Cover Screw Kit 1970-1992 Harley-Davidson Big Twins - Chrome Plated
$24.26

Colony #7152-20 Heat Treated Acorn Head Bolt Kit - 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$66.63

Colony #7144-5 Acorn Head Screw Kit For Rear Wheel Star Shaped Covers 1/4-24 Thread - Chrome Plated
$17.22

Colony #7131-8 Lifter Base Acorn Screw Kit - 1936-1975 OHV Harley-Davidson Davidson Big Twin - Chrome Plated
$25.71

Colony #7120-4 Aluminum Valve Retainers - All Harley-Davidson Davidson OHV 74's
1 review $35.13

Colony #8306 PARK Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Aluminum Head - CAD Plated
$339.82

Colony #8304 CHR Complete Stock Hardware Kit - 1937-1939 Harley-Davidson 74 & 80 Cast Iron Head - Chrome Plated
$389.63

Colony #8313 CAD Complete Stock Hardware Kit - 1979-1980 Harley-Davidson Shovelhead - CAD Plated
$266.32

Colony #8307 CHR Complete Stock Hardware Kit - 1966-1969 Harley-Davidson Shovelhead - Chrome Plated
$387.28

Colony #9742-6 Front Fender Mounting Kit 1936-1948 Harley-Davidson Springers - Chrome Plated
$22.09

Colony #9740-2 Front Brake Cable Sleeve Adjuster 1928-1940 Harley-Davidson All Models - Chrome Plated
$17.14

Colony #9736-1 Gear Box Adjusting Screw 1936-1964 Harley-Davidson Big Twin - CAD Plated
$15.52

Colony #9730-3 Gas Strainer Brass Cap 1932-1938 Harley-Davidson Twins
$17.52

Colony #9716-8 Cylinder Base Nut Lockwashers 1930-1977 Harley-Davidson Big Twin - Parkerized
$4.76

Colony #9715-8 Cylinder Base Nut Lockwashers 1930-1977 Harley-Davidson Big Twin - Chrome Plated
$6.14

Colony #9683-2 Front Brake Cable Sleeve Adjuster & Nut 1928-1940 Harley-Davidson All Models - Parkerized
$15.52

Colony #9635-4 Oil Pump Check & Relief Valve Plugs 1981-Up Harley-Davidson FL/FX - CAD Plated
$15.94

Colony #9631-1 Oil Pump Stud Nut Short 1941-1948 Harley-Davidson 74/80 SV 1941-1954 45's - Parkerized
$5.58

Colony #9616-4 Rear Stand Mounting Kit 1938-1957 Harley-Davidson Big Twins 1939-Up 45s - Chrome Plated
$22.80

Colony #9531-13 Rear Crash Bar Mounting Kit 1936-1957 Harley-Davidson Big Twin - CAD Plated
$36.54

Colony #9530-13 Rear Crash Bar Mounting Kit 1936-1957 Harley-Davidson Big Twin - Chrome Plated
$43.32

Colony #9525-1 Oil Pump Check Valve Plug 1936-1980 Harley-Davidson Big Twin 1937-Up UL/45s - Parkerized
$9.56

Colony #9405-3 Front Axle Nut Kit 1930-1936 Harley-Davidson VL 1936-1945 Big Twins - Chrome Plated
$24.98

Colony #9306-7 Timing Cover Screw Kit 1970-1980 Harley-Davidson Shovelhead - CAD Plated
$10.04

Colony #9210-1 Exhaust Pipe Nut 1921-1924 Harley-Davidson 75 1925-1929 61 & 74 OEM# 1014-21 - Nickel Plated
$28.25

Colony #9209-1 Exhaust Pipe Nipple 1924-1929 Harley-Davidson 74 & 61 Twins OEM# 1012-25 - Nickel Plated
$47.07

Colony #9108-2 Generator Screws 1930-1948 Harley-Davidson Big Twin Sidevalves OEM# 1523-30 - Chrome Plated
$13.94

Colony #9015-3 Dash Mounting Kit Cap Head 1986-Up Harley-Davidson FXR (Except 88-Up FXRS) - Chrome Plated
$10.76

Colony #9004-2 Brake Cable Lubricator 1930-1938 Harley-Davidsons OEM# 4142-30
$30.04

Colony #8940-2 Swingarm Pivot Bolt Cover Red Reflectors 1986-1999 Harley-Davidson FXST/FLSH - Chrome Plated
$24.62

Colony #8939-2 Swingarm Pivot Bolt Cover Amber Reflectors 1986-1999 Harley-Davidson FXST/FLSH - Chrome Plated
$24.62

Colony #8938-2 Front Brake Cable Sleeve Adjuster & Nut 1928-1940 Harley-Davidson All Models - CAD Plated
$15.52

Colony #8935-9 Caliper Anti Vibration Kit 1973-1980 Harley-Davidson FL/FX - CAD Plated
$22.00

Colony #8926-3 Gas Strainer Cap Head 1942-1965 Harley-Davidson Twins OEM #3629-32 3633-32 - CAD Plated
$14.34

Colony #8925-3 Gas Strainer Cap Head 1942-1965 Harley-Davidson Twins OEM #3629-32 3633-32 - Chrome Plated
$16.34

Colony #8922-5 Transmission Shifter Cover Cap Head Screw Kit 1988-Up Harley-Davidson Evo FX/FL - Chrome Plated
$17.52

Colony #8920-3 Clutch Arm Fulcrum Rebuild Kit 1941-1973 Harley-Davidson 45's OEM #37052-44 - Parkerized
$11.96

Colony #8917-19 Primary Cover Chrome Acorn Head Screw Kit 1989-2006 Harley-Davidson Softail 1991-2005 Dyna - Chrome Plated
$56.11

Colony #8914-17 Primary Cover Acorn Head Screw Kit 1985-Up Harley-Davidson FXR 1985-1999 FLT - Chrome Plated
$49.25

Colony #8912-13 Transmission Side Cover Chrome Acorn Head Screw Kit 1987-2006 Harley-Davidson FXR/FLT/Softail 1991-2005 Dyna - Chrome Plated
$43.09

Colony #8855-4 Front Axle Nut Kit 1937-1952 Harley-Davidson 45 Solo OEM #3910-37 - CAD Plated
$6.38

Colony #8853-4 Front Axle Nut Kit 199-1936 Harley-Davidson 45 Solo OEM #0128 - CAD Plated
$5.18

Colony #8844-10 Sprocket Cap Style Bolt & Nut Kit 1985-1992 Harley-Davidson Big Twin Spoked Rear Wheel - Chrome Plated
$29.70

Colony #8843-10 Sprocket Nut & Bolt Kit Acorn 1985-1992 Harley-Davidson Big Twin - Chrome Plated
$29.70

Colony #8839-10 Sprocket Bolt & Washer Kit Cap Head 1993-1998 Harley-Davidson Big Twin Spoke Wheel 1979-1990 XL Cast Wheel - Chrome Plated
$39.11

Colony #8838-10 Sprocket Bolt & Washer Kit Acorn Head 1993-1998 Harley-Davidson Big Twin Spoke Wheel 1979-1990 XL Cast Wheel - Chrome Plated
$39.11

Colony #8779-12 Rocker Box Mounting Kit 1936-1947 Harley-Davidson Knucklehead - CAD Plated
$19.51

Colony #8778-12 Rocker Box Mounting Kit 1936-1947 Harley-Davidson Knucklehead - Chrome Plated
$22.80

Colony #8743-14 Oil Pump Mounting Kit 1967-1977 Harley-Davidson Big Twin - CAD Plated
$20.31

Colony #8721-1 Oil Pump Mounting Nut 1941-1948 Harley-Davidson 74/80 1941-1954 45s - CAD Plated
$5.58

Colony #8719-1 Oil Pump Mounting Nut 1941-1948 Harley-Davidson 74/80 1941-1954 45s - Chrome Plated
$6.78

Colony #9948-8 Electrical Panel Cover Mounting Allen Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
$5.95

Colony #9947-8 Electrical Panel Cover Mounting Acorn Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
$11.96

Colony #9940-9 Fuel Gauge Housing Trim Panel Button Allen Kit 1994-Up Harley-Davidson FXD/FXDS-CON/FXDX - Chrome Plated
$9.16

Colony #9936-28 Front Motor Mount Kit Acorn 1991-Up Harley-Davidson Dyna - Chrome Plated
$36.20

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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