How do I know what size petcock I need for my motorcycle?

The first consideration when choosing a petcock is to determine which direction the petcock outlet needs to be facing, left side, right side, or vertical. Next you need to know two measurements in order to choose the right petcock for your motorcycle. You need to know the size of the fuel inlet on your carburetor. Typically, you want the same size fuel line going from your petcock to your carburetor. The second measurement is the thread pitch and size for your petcock bung on your gas tanks. Your petcock has to have the same thread pitch and size in order to mount into your gas tank.

How do you know when your petcock on a motorcycle is bad?

Typically, when your petcock goes bad one of a few things can happen. If the petcock has a diaphragm inside, and it goes bad, the petcock will leak externally. If the seals go bad inside the petcock, it will allow fuel to pass when the valve is closed and in some cases will slowly siphon the gas out of your tank. If the petcock fails due to debris or corrosion, it will simply not allow gas to flow.

Is it okay to use a cheap petcock?

A petcock is a simple valve. It allows gas to flow and it stops gas from flowing. Since the product is so simple there is really not a lot that can go wrong. A good metal petcock should give you many years of service. Just buy something decent so you don't get stranded on the side of the road.

What is Reserve on a petcock, and how do you use it?

The reserve setting on your petcock allows you to draw fuel from the bottom of your gas tank. During normal operation of your motorcycle, you should set your petcock to the “on” position. This will allow fuel to flow from the tank through the top portion of the petcock and out to your fuel system. When you move the petcock selector to the “reserve” position, it allows the fuel to flow from the tank through the bottom portion of the petcock and out to your fuel system. This reserve function allows you to get to the next fuel stop before you run out of gas.

Motorcycle Petcocks

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1/4 inch NPT Petcock - Stainless Steel Prism Supply Co.
$119.95

1/4 inch NPT Lever Petcock - Chrome Plated Brass Cycle Standard
$20.78

1/4 inch NPT Power-Flo Petcock - Hex Body - Aluminum - Inward Pingel
$119.95

EFI To 22mm Gas Tank Petcock Adapter - 2007-Up Harley-Davidson XL Cycle Standard
$90.83

1/4 inch NPT Mini Petcock 90 degree Mini Ball Valve Cycle Standard
$18.99 $29.04

1/4 inch NPT 90 Degree Petcock - Brass Prism Supply Co.
$109.99

1/4 inch NPT Petcock Chrome - Straight Cycle Standard
$32.13

1/4 inch NPT 90 Degree Petcock - Stainless Steel Prism Supply Co.
$129.99

22mm Petcock Harley-Davidson Style - Black - Left Hand Outlet Cycle Standard
$32.13

22mm Petcock Round Body Chrome Harley-Davidson Style - Left Side Position Cycle Standard
$61.48

1/4 inch NPT Mini Petcock 90 Degree Outlet - No Reserve Motion Pro
$22.99

1/4 inch NPT Petcock Chrome - 90 Degree Cycle Standard
$32.13

22mm Petcock Harley-Davidson Style - Chrome - Left Hand Outlet Cycle Standard
$32.13

1/4 inch NPT Petcock - Brass Prism Supply Co.
$94.95

1/4 inch NPT Lever Petcock - Solid Brass Cycle Standard
$23.09

3/8" NPT 90 Degree Petcock - Stainless Steel Prism Supply Co.
$109.99

22mm Petcock - Brass Prism Supply Co.
$104.99

22mm Petcock Round Body Solid Brass Harley-Davidson Style - Left Side Position Cycle Standard
$61.48

22mm Petcock Harley-Davidson Style - Black - Straight Outlet Cycle Standard
$29.34

3/8 inch NPT Petcock Straight Outlet Cycle Standard
$34.92

1/4 inch NPT Petcock Black - Straight Cycle Standard
$26.55

3/8" NPT 90 Degree Petcock - Brass Prism Supply Co.
$109.99

3/8 inch NPT Petcock 90 Degree Outlet Cycle Standard
$32.13

1/4 inch BSP Petcock Fuel Valve - Main - No Reserve - For Triumph BSA Norton British Standard
$20.95

22MM Power-Flo Petcock - Hex Finned Body - Chrome - Inward Pingel
$152.95

22MM Power-Flo Petcock - Round Body - Chrome - Forward Pingel
$152.95

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

22MM Click-Slick Petcock - Round Body - Raw Brass - Forward Golan Products Inc.
$130.95

22MM Click-Slick Petcock - Round Body - Raw Brass - Downward Golan Products Inc.
$130.95

22mm Petcock Harley-Davidson Style - Chrome - Straight Outlet Cycle Standard
$32.13

3/8 inch NPT Petcock - Stainless Steel Prism Supply Co.
$119.95

In-Line Brass Motorcycle Petcock Kustom Tech
$77.74

22mm to 1/4 inch NPT Chrome Petcock Adapter Nut Lowbrow Customs
$24.13

1/4 inch BSP Petcock Fuel Valve Petcock Fuel Valve - Main - UK Made For Triumph BSA Norton British Standard
$42.48

Sealing Washer for British 1/4 inch BSP Petcocks OEM # 70-7351 - Triumph BSA Norton British Standard
$6.97

22mm Petcock Harley-Davidson Style - Chrome - Right Hand Outlet Cycle Standard
$32.13

1/4 inch BSP Petcock Fuel Valve - Reserve - For Triumph BSA Norton British Standard
$20.95

22MM Power-Flo Petcock - Hex Body - Black - Inward Pingel
$173.95

22mm to 1/4 inch NPT Brass Petcock Adapter Nut Lowbrow Customs
$24.13

22MM Power-Flo Petcock - Hex Body - Brass - Inward Pingel
$152.95

22MM Power-Flo Petcock - Round Finned Body - Chrome - Inward Pingel
$152.95

22MM Power-Flo Petcock - Round Body - Chrome - Backward Pingel
$152.95

22MM Power-Flo Petcock - Hex Body - Chrome - Forward Pingel
$152.95

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

3/8 inch NPT Power-Flo Petcock - Hex Body - Brass - Inward Pingel
$131.95

3/8 inch NPT Power-Flo Petcock - Hex Body - Chrome - Forward Pingel
$131.95

3/8 inch NPT Click-Slick Petcock - Round Body - Chrome - Straight Golan Products Inc.
$130.95

3/8 inch NPT Click-Slick Petcock - Round Body - Chrome - Backward Golan Products Inc.
$130.95

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Aftermarket Motorcycle Petcock & Fuel Valves for Sale A motorcycle petcock is simply the fuel valve that allows you to turn on or shut off the flow of gasoline from your gas tank to your carburetor. The funny name comes from the two words. “Pe...

Aftermarket Motorcycle Petcock & Fuel Valves for Sale

A motorcycle petcock is simply the fuel valve that allows you to turn on or shut off the flow of gasoline from your gas tank to your carburetor. The funny name comes from the two words. “Pet” refers to “small” as in French “petit”. The term "cock" means "to block" or "stop." This is where the term fuel petcock valve came from.

How to choose the right Petcock Sizes for your motorcycle?

There are a number of different fuel petcock valve sizes available. Late model Harley-Davidsons typically use a 22mm petcock, which are available in a variety of price ranges depending on the quality, fit and finish and brand. The 22mm motorcycle petcock bung is also found on a variety of custom gas tanks such as the Narrow Frisco Sporty Gas Tank and the Blackbird Legacy Gas Tank for 1982-2003 Harley-Davidson Sportsters®.

Many custom and aftermarket gas tanks such as the Narrow Alien Gas Tank and Super Narrow Frisco Mount Sportster® Gas Tank also use a 1/4 inch NPT or 3/8 NPT petcock. NPT stands for National Pipe Thread, and it is a tapered thread that seals as you tighten the motorcycle gas tank petcock into the threaded fitting on your gas tank.

Lowbrow Customs also makes motorcycle petcock adapter nuts in both brass and chrome and allow you to adapt your 22mm petcock bung to accept either a 1/4 inch NPT or 3/8 inch NPT petcock.

Types of Motorcycle Petcocks

Standard motorcycle fuel petcocks and universal fuel petcocks have two positions: on and off. Some motorcycle fuel petcocks offer a reserve function. A petcock that has reserve has a small tube inside the mesh filter that sits up higher than the bottom of your gas tank.

If you have your petcock in the ON position while riding and your bike starts sputtering as you run out of gas, you can simply turn your petcock to the reserve position and use the bit of reserve gasoline left in your tank. Hopefully there is enough to get you to a fuel station. A motorcycle fuel petcock with a reserve setting gives a bit of peace of mind to those who are riding around with smaller gas tanks. You could watch our reviews video to choose the best motorcycle petcock for your bikes.

Find the Perfect Petcock for Your Harley-Davidson Motorcycle at Lowbrow Customs

At our online store, we offer a wide selection of motorcycle petcocks, including options specifically designed for Harley-Davidson motorcycles. Whether you need a petcock for Harley Davidson or a universal fuel petcock, we have the right solutions to meet your needs.

Our petcocks for Harley Davidson come in various sizes, materials, and finishes to ensure a perfect fit for your motorcycle. We understand the importance of quality, which is why we provide products that deliver reliable performance and precise fuel control.

Choose from our range of 22mm petcocks, commonly used in late model Harley-Davidsons, or explore our selection of 1/4 inch NPT or 3/8 NPT petcocks, suitable for many custom and aftermarket gas tanks. We also offer motorcycle petcock adapter nuts in brass and chrome, allowing you to adapt your 22mm petcock bung to accept either a 1/4 inch NPT or 3/8 inch NPT petcock.

Invest in a High-Quality Fuel Petcock Valve

When it comes to your motorcycle's fuel system, a reliable fuel petcock valve is essential. Our motorcycle fuel petcocks provide optimal fuel flow control, ensuring efficient performance and smooth operation of your carburetor.

Whether you ride a Harley-Davidson or another brand, our universal fuel petcocks are designed to meet the needs of various motorcycles. With two positions, on and off, our standard and universal petcocks offer straightforward functionality.

For added convenience, consider a motorcycle fuel petcock with a reserve setting. This feature provides peace of mind, especially for riders with smaller gas tanks. When you run low on fuel while riding with the petcock in the ON position, switching to the reserve setting allows you to utilize the remaining reserve gasoline and reach the nearest fuel station safely.

Browse our extensive selection of motorcycle petcocks and fuel valves for sale. With our diverse range of options and expert guidance, you can find the perfect fuel valve to enhance the performance and reliability of your motorcycle's fuel delivery system.

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Motorcycle Petcocks FAQ

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