Question about 1978 Suzuki GS 750 E

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Pet **** issues "perhaps"

There are three positions on my fuel valve res, on, and pri. In my manual the pri position is to just get fuel to the carbs. However, The bike is running way to lean when in positions on or res. It runs right in the primary position. Did I miss something when I hooked up the tank or could there be a problem with the valve..

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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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Posted on Jan 02, 2017

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What you are dealing with is a vacuum petcock with a bad vacuum diaphragm , in this case fuel is bypassing the petcock via the vacuum line and filling the engine (oil) with gasoline.
If you have a standard petcock that is leaking (not shutting off properly) or just left in the on position a stuck float needle will also fill your engine (oil) with gasoline. This can happen with a clean carburetor and a good float needle. It just sticks and you have to change your oil. If you have the kind of fuel petcock that allows you to turn it off when not in use , always turn off your gas when not riding.
You will have to change your oil if it is fouled with gasoline. I suspect a vacuum operated petcock is at fault. With standard petcocks I have seen new motorcycles in perfect order stick a float needle ( Kei Hin Carburetors ) and fill there engines and air boxes with gas/oil mix. On vacuum petcocks the diaphragm that shuts off the fuel flow is usually leaking and at fault.

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( 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!!!

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What position on the petcock is on off or res on a 93 katana gsx600f


There is no OFF, you have RES toward front , ON is all the way down, and prime toward back, PRI is used when it has been sitting for awhile. RES and ON wont let gas out unless bike is runnig. There is a vac hose on back of petcock that lets ON and RES work it must be connected..

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What is the off position for the petcock in the vstar 250? I only see ON, PRI, and RES. I just got the bike from someone else and I know that you are supposed to turn the petcock to the off position when...


up (res) is reserve, down(on) is primary, center(marked as pri is for prime, used for if ran out of fuel or drained the carb or been sitting for a long time). There is no off as the fuel system is vacuum fed instead of greavity)

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You're bike may be equipped with a vacuum operated petcock. See if the fuel valve has a "prime" position on it. If so, put it in this position. If you still don't get any fuel to the carb, you'll have to remove the petcock from the tank and clean the screen or unstop the petcock. I'd put a manual petcock in and block the vacuum line.

If you already have a manual petcock and you're not getting fuel, remove the petcock, clean the screen, and blow air through the petcock in both the "On" postition and the "Res" position.

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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.

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A motorcycle started in reverse? or the engine ran backwards? Two cycle engines will do that if they kick back just right. Anyway, the fuel issue says the float needle is no seating? Did they bother to ck that the float isn't filling with fuel and the float level is correct? Another thing is the petcock. Is it a three position valve? If so, Make sure it is NOT turned to the PRI or RES positions. Good Luck Ned-.

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The fuel switch has three positions:
The arrow on the handle points to the position selected.

ON = Normal operation setting. Fuel will not flow through the hose to the carb until the engine is on. Gas in the carb bowl is used to start the engine. The arrow is DOWN when in the on position.

PRI = Fuel flows through the hose to the carb at all times. This setting is used if the bike has been sitting around and the fuel level in the carb may be too low to start the engine. For safety use this setting only to fill the carb bowl with gas or for brief testing.

RES = If you run out of gas, this setting will provide extra gas so you can hopefully find more.

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