Question about kawasaki EN 500 Vulcan Classic Motorcycles

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Vulcan 500 fuel reserve switch reads PRI ... what is it ?

The fuel switch has three positions: on, reserve and PRI .... What is PRI?

Posted by Anonymous on


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Posted on Jan 02, 2017

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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"

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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

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SOURCE: just got 1st bike a 2001 yamaha vstar in which

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

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SOURCE: 2007 Virago 250 only runs when fuel switch is in

there should be a vaccum hose going to the valve, if its good then the valve is bad

Posted on May 05, 2010

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SOURCE: My 1996 750 Katana runs but it will only run with

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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Which way is on position for gas on my 2005 katana gsx600f

Arrow pointing up on the knob is (RES) reserve to the side is (PRI) prime which bypasses the vacuum part of the tap and ON is downwards.use prime only when you have run out of fuel n on and you need to switch to reserve ,prime will let you refill the carbs without running the engine.

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What is button on gas tank for?

It's the fuel petcock switch. Here are some pictures of it:

Fuel petcock valves are common on motorcycles which don't have a dedicated fuel level gauge. They are use to turn the fuel tank "on" or "off", and they also have a "reserve" position which taps into a section of the fuel tank which contains reserve fuel to allow you to make it back to a gas station should you run out of fuel in the "on" position.

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Gas tank

no...Full is on...res is reserve...Pri is Prime.
Do not leave it on prime !!! This is for re-filling the carbs when they have been emptied.
It is a vacuum operated tap, when switched to full or reserve, fuel only flows when the engine turns flows fuel all of the time.
The tap should be set to full unless fuel is running low.
Leaving it on prime when not running can lead to serious engine damage !!!

Mar 26, 2014 | 2008 Keeway Supershadow 250

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Regarding the fuel stopcock of yamaha chappy, it has three settings: on, reserve and PRI, what is the neaning of PRI?, thanks...

You have a vacuum operated that when engine starts and draws vacuum...a diaphragm lifts in the petcock to supply fuel to carb. When the engine shuts off...vacuum is lost and the petcock closes.
If you run the tank order to get fuel into the carb and get the bike started can open the petcock without engine vacuum by rotating petcock to the PRIME position. Once started return the petcock to the ON position. If you leave it on prime....with engine off...fuel may leak into carb and run into engine and contaminate crankcase oil with fuel.

Mar 22, 2011 | Yamaha YZ 125 Motorcycles

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I just bought a KLE 500 second hand, it is my first bike and few things i am not familiar with: - i cant seem to be able to lock the box on the back seat - on the left handle...

cant help with lock, try some graphite powder.
left switch will have high and low beam( H and L) and a horn.(and possibly headlight on off,but this is usally on right hand side)
Pri is prime, only to be used to help start bike if you have run out of fuel, this bypasses the vacumn fuel tap, do not ride, park or leave it on pri.
refill when it runs out and you need to switch to reserve, if you take a note of the odometer reading when you fill, you can figure out how far it goes on a tank full and plan your trips, the reserve is to get you the 10-20klms to the next station.

Mar 16, 2011 | kawasaki KLE 500 Motorcycles

1 Answer

Lt-f250x fuel vale has on- res-pri what is the pri position for

( PRI ) is the primer position for the petcock ( fuel valve) . This position is used for a couple of reason. this kind of valve works off vacuuum from the carbs, but if you run out of fuel you or remove the tank you can't create vacuum, so putting the valve into the PRI position allows fuel to flow inton the carbs without vacuum so you can start the bike. Once the bike has started you should switch the valve back to the ON position ON= normal position, PRI= primer position, RES= reserve postion. I hope this helps!!!

Sep 06, 2010 | Suzuki GSX 250 FX Motorcycles

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I have a stock petcock on my 2001 Vulcan VN800A. The three positions are run, reserve and prime. Do all of these positions allow constant fuel flow when the engine is not running?

Run and reserve operate off the vacuum diaphragm. Prime is the only position that should allow fuel to flow with out having the engine turned on.

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Which way should the reserve tap be facing so its off and not using the reserve??

There is usually "on","Prim",and "Res". If in the on position it only uses fuel when the bike is running. so thats where it should be unless your low on gas and need reserve. The pri position should only be used for a few seconds or used to start the bike and once started should be switched to on.

Apr 17, 2010 | 2003 Suzuki GZ 125 Marauder

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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.

Oct 01, 2009 | 1996 kawasaki GPZ 1100

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