Question about kawasaki EN 500 Vulcan Classic Motorcycles
The fuel switch has three positions: on, reserve and PRI .... What is PRI?
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Posted on Jan 02, 2017
SOURCE: Positions "Reserveswitch"
The On position is where you run the bike after filling the tank. The Res position is when you are almost out of fuel and the motor stutters you turn the switch it it and that will give you about 1/2 a gallon of gas left in the tank to get to a gas station and refill. Pri is for priming the carbs only. If you have ran out of gas after using the reserve fuel you switch it to this position to fill the float bowls with fuel. Do this for only 30 seconds and switch it back to On position.
Posted on Oct 01, 2009
Testimonial: "Thank you very much! Atlast I know the meaning of the positions. Grtz, Steven"
SOURCE: pet **** issues "perhaps"
Remove the petcock valve and dissasemble and clean it may have a clogged passage or this type may have bowl with a screen in side that is dirty, clean the valve with gum out and blow out with compressed air if possible.
Posted on Oct 02, 2009
This is the position you would use only if your carburetor bowl is empty, and that usually only happens after the bike has been sitting unused for a long time - like over the winter. You should NOT run normally with the petcock set to Prime, because it lets gas flow to the carb freely - whether the engine is running or not. It is to be used for priming the carburetor bowl only.
On: This is the setting you should use regularly. It is enabled by a vacuum-operated diaphragm, so it only allows fuel to flow when the engine is running. When the engine isn't running, the diaphragm is closed. Therefore, no fuel will flow from the tank to the carb.
Reserve: This setting is works almost like the ON setting. It is enabled by a vacuum-operated diaphragm as well. The only difference is that it uses a different fuel pickup tube whose opening is lower in the tank, therefore it can access the last bit of available gasoline.
Hope this helps!
Posted on Oct 18, 2009
You may need to rebuild the fuel tap with a new diaphram kit.
The fuel tap has a small rubber diaphram and plunger, which can go hard, stick closed , or wear out and get a hole.
Also check the vacumn hose than opperates the tap is in good condition
Pri bypasses the vacumn opperated fuel tap, sometimes this can cause the carbs to flood or have higher than normal float levels..
Running it on prime can also cause the carbs to flood fuel into the engine filling the sump, which then s ucks fuel vapour through the crank breather into the airbox, and then through the carbs causing over rich.
If this has happened you also need to change the oil and fit a new air filter element
Posted on Jul 17, 2010
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