Gas Tank Fuel Cock Valve Petcock for Yamaha XS650 XS750 Special XS850 XS1100

Gas Tank Fuel Cock Valve Petcock for Yamaha

This replacement petcock assembly controls the gravity-fed flow of gasoline from the fuel tank to the carburetors, ensuring stable operation and leak-free shutoff for Yamaha motorcycles.

Overview

This gas tank fuel cock valve petcock is designed to control the flow of fuel from the tank to the carburetors on classic motorcycles. Riders and mechanics can use this gas tank fuel cock valve petcock to replace leaky or clogged stock valves that disrupt fuel delivery. It provides three operational positions to manage fuel flow and reserve capacity during normal riding.

Built For Performance

• Dual outlet configuration designed to match dual carburetor setups.
• Three-position valve lever offering ON, RES, and PRI settings.
• Corrosion-resistant metal body engineered to withstand modern gasoline blends.
• Internal mesh screen to filter out tank rust and debris before it reaches the carburetors.

Fits These Machines

• for Yamaha XS650
• for Yamaha XS750 Special
• for Yamaha XS850
• for Yamaha XS1100

On-The-Job Use

• Replacing a dry-rotted or leaking original fuel petcock during vintage motorcycle restorations.
• Preventing engine flooding by completely shutting off gravity-fed gasoline when the motorcycle is parked.
• Switching to the reserve fuel supply when the main tank level drops during long highway rides.

Specs At A Glance

Good To Know

Q: Why does my new petcock have a primary (PRI) position? A: The primary position bypasses the vacuum safety diaphragm to allow fuel to flow directly into empty carburetor bowls after the vehicle has sat idle. This helps ensure faster starting without draining the battery.

Q: How often should I clean the internal mesh filter? A: The internal filter should be inspected and cleaned annually or whenever you flush the fuel tank. This prevents rust particles from clogging the valve ports and restricting fuel delivery.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.