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.

Ready Motorcycle Petcocks

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Prism Supply Co. 1/4 inch NPT Polished Stainless Steel Petcock
10 reviews $119.95

Prism Supply Co. 1/4 inch NPT Polished Brass Petcock
3 reviews $94.95

Cycle Standard 1/4 inch NPT Petcock Chrome - Straight
23 reviews $25.29

Cycle Standard 1/4 inch NPT Lever Petcock - Chrome Plated Brass
36 reviews $17.99

Cycle Standard 1/4 inch NPT Petcock Chrome - 90 Degree
22 reviews $25.29

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Left Hand Outlet
25 reviews $25.29

British Standard 1/4 inch BSP Petcock Fuel Valve - Reserve - For Triumph BSA Norton
13 reviews $16.49

Prism Supply Co. 22mm Polished Stainless Steel Petcock
$119.99

Cycle Standard 22mm Petcock Harley-Davidson Style - Black - Left Hand Outlet
13 reviews $25.29

Cycle Standard 3/8 inch NPT Petcock Straight Outlet
25 reviews $27.49

Cycle Standard 22mm Petcock Harley-Davidson Style - Black - Straight Outlet
21 reviews $23.09

Prism Supply Co. 22mm Polished Brass Petcock
1 review $94.99

Motion Pro 1/4 inch NPT Mini Petcock 90 Degree Outlet - No Reserve
14 reviews $20.99

British Standard 1/4 inch BSP Petcock Fuel Valve - Main - No Reserve - For Triumph BSA Norton
10 reviews $16.49

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Straight Outlet
15 reviews $25.29

Cycle Standard 1/4 inch NPT Lever Petcock - Solid Brass
30 reviews $19.99

Motion Pro 1/4 inch NPT Mini Petcock Straight Outlet - No Reserve
7 reviews $20.99

British Standard 1/4 inch BSP Petcock Fuel Valve - Reserve - UK Made For Triumph BSA Norton
13 reviews $40.87

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Right Hand Outlet
15 reviews $25.29

Cycle Standard 1/4 inch NPT Petcock All Solid Brass with Lever Handle
14 reviews $21.99

Kustom Tech Carb Mounted Petcock for S&S Carburetor
5 reviews $82.58

Cycle Standard 3/8 inch NPT Petcock 90 Degree Outlet
18 reviews $25.29

Kustom Tech In-Line Brass Motorcycle Petcock
11 reviews $74.04

British Standard Sealing Washer for British 1/4 inch BSP Petcocks OEM # 70-7351 - Triumph BSA Norton
12 reviews $5.49

Cycle Standard 22mm Petcock Round Body Chrome Harley-Davidson Style - Left Side Position
15 reviews $48.39

Prism Supply Co. 3/8 inch NPT Polished Stainless Steel Petcock
1 review $119.95

British Standard 1/4 inch BSP Petcock Fuel Valve Petcock Fuel Valve - Main - UK Made For Triumph BSA Norton
8 reviews $40.87

Lowbrow Customs 22mm to 3/8 inch NPT Chrome Petcock Adapter Nut
10 reviews $16.99

Lowbrow Customs 22mm to 1/4 inch NPT Brass Petcock Adapter Nut
13 reviews $16.99

Cycle Standard 22mm Petcock Harley-Davidson Style - Black - Right Hand Outlet
10 reviews $25.29

Lowbrow Customs 22mm to 3/8 inch NPT Brass Petcock Adapter Nut
13 reviews $16.99

Lowbrow Customs 22mm to 1/4 inch NPT Chrome Petcock Adapter Nut
5 reviews $16.99

Cycle Standard EFI To 22mm Gas Tank Petcock Adapter - 2007-Up Harley-Davidson XL
$71.49

Cycle Standard 1/4 inch NPT Petcock All Solid Brass with T Handle
10 reviews $21.99

British Standard Petcock Straight Fuel Feed Pipes British Triumph BSA Norton OEM # 82-3334
4 reviews $13.19

Motion Pro In-Line Motorcycle Petcock - 1/4 inch Hose Barbs
$19.99

British Standard 1/4 inch BSP Petcock Fuel Valve Reserve For Triumph 650 750 Norton 750 850
2 reviews $19.79

British Standard 1/4 inch BSP Petcock Fuel Valve Main For Triumph 650 750 Norton 750 850
3 reviews $19.79

Cycle Standard 22mm Petcock Harley-Davidson Style - Chrome - Dixie - Straight Outlet
$21.99

British Standard Flat Washer for British 1/4 inch BSP Petcocks OEM # 83-0002 Triumph BSA Norton
4 reviews $2.19

Bates 22mm Petcock Conversion Kit 1940-65 H-D Big Twins and 45”/750 cc Sidevalves - CAD Plated
$65.37

Kustom Tech 3/8 inch NPT Custom Petcock - Polished Brass
2 reviews $111.06

V-Twin Manufacturing 1/4 inch NPT Mini Petcock 90 degree Mini Ball Valve
26 reviews $23.95

Bates 1/4 inch NPT Petcock Conversion Kit 1940-65 H-D Big Twins and 45 inch/750 cc Sidevalves - CAD Plated
$65.37

Kustom Tech Carb Mounted Chrome Petcock for S&S Carburetor
2 reviews $96.82

Bates 22mm Petcock Conversion Kit 1940-65 H-D Big Twins and 45”/750 cc Sidevalves - Parkerized
$34.42

Cycle Standard 22mm Petcock Round Body Solid Brass Harley-Davidson Style - Left Side Position
9 reviews $48.39

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