How does peacock valve work?
It uses engine vacuum createdwhen the engine is running to pull back a small piston that allows the fuel to flow. When the engine shuts off, the vacuum is removed and the fuel shuts off. ON is the position for normal operation and the position you return to after refueling the bike.
What is RES on fuel valve?
The RES switch on the fuel valve helps you to use the fuel stored in reserve tank when your main fuel tank has run out of fuel. Once you switch to RES in the fuel valve, the fuel from the reserve tank is transferred to the carburetor which is then sent to the engine for power generation to the motorcycle.
What did petcocks used to be used for?
Historically, petcocks were used on gravity-feed fuel systems found on automobiles. With universal adoption of fuel pumps they have all but disappeared in that application.
How many lines are there on a petcock?
There are two lines to / from the petcock– a large one for fuel, and a thin one, connected to carb inlet runnner #2 or #3, to provide engine vacuum. The thin line doesn’t carry ANY fuel, unless something is wrong (see TOO MUCH below). There are (usually) three petcock switch positions:
How is the petcock connected to the CARB?
These threads go on forever, since the problem rarely gets solved. There are two lines to / from the petcock– a large one for fuel, and a thin one, connected to carb inlet runnner #2 or #3, to provide engine vacuum. The thin line doesn’t carry ANY fuel, unless something is wrong (see TOO MUCH below).
Can a petcock cause too much fuel to flow?
This is the ONLY petcock problem that causes too much fuel to flow, and only to the one carb. ALL OTHER problems involving too much fuel are CARB PROBLEMS. This does not mean that you have one or the other! On an old bike, odds are you have multiple problems.
What does the petcock do on an ATV?
The fuel valve, or fuel petcock, is a small shut-off valve that controls the flow of liquid fuel. ATVs and UTVs, like motorcycles, have fuel tanks that are situated higher than the carburetor and fuel feeds are controlled by gravity.
Where does the name petcock come from on a motorcycle?
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.
What happens when you run out of fuel on a petcock?
First is the likelihood that the carbs will overflow (see OFF above) or because the PRIME position uses the RESERVE fuel level. If you continue to operate the bike at the reserve level and run out of fuel you will be OUT OF FUEL (see pushing the bike). The failure of this shutoff system necessitates the rebuilding or replacement of the valve.
What kind of valve does a petcock engine use?
Vacuum Operated This is the most common valve found in use today. It uses engine vacuum createdwhen the engine is running to pull back a small piston that allows the fuel to flow. When the engine shuts off, the vacuum is removed and the fuel shuts off. This valve also has three positions: ON – RESERVE – PRIME