Question about 1993 Suzuki GSX-R 750 WP

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Fuel tap position for 1994 GSXR 750

I have recently bought a 1994 GSXR 750 and dont know what position the fuel tap should be for ON, RESERVE or PRIME.

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  • angelajpowel Feb 22, 2009

    thank you very much

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  • 16 Answers

Down for on, forward for reserve, backwards for prime

Posted on Feb 21, 2009

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2 Answers

The petcock valve on the Bigboy TSR 250. What position must the valve handle be when driving. Please explain the 3 positions on the valve.


Is the tap vacuum operated? There will be a pipe from the carb to the tap if there is, and when the engine is running the vacuum from the carb pulls on a diaphragm and opens the flow.
If this is the case, the 3 positions are "PRIME", "MAIN" and "RESERVE".
Disconnect the pipe from the outlet of the tap, but be prepared for fuel to come out. If it does, then the tap is set in the prime position so move it to another setting to stop it. If it doesn't start flowing then the tap is set to main or reserve.
Main and reserve are self explanatory and are standard on most bikes, but prime is not on as many. Never ride on prime as this just allows fuel to flow freely and is only used to start a long standing bike or one that has been run to empty. It does what it says and primes the carb. Once running switch over immediately to main or reserve.

Oct 22, 2015 | Motorcycles

1 Answer

Which way to turn the reserve tank switch on


There are 3 positions (as you probably know). Reserve, on and prime. Under normal conditions with a properly working fuel tap, prime is the by-pass that allows fuel to flow through without the engine running. On and reserve will only allow fuel to pass when the engine is running (uses vacuum from the carb).
  • PRIME has the handle facing down
  • ON is when it is facing the front
  • RESERVE when it faces the rear.
Do not leave the tap in the prime position EVER as this allows the fuel to fill the carb and with the engine running or attempting to start will cause hydrolock that will bend the pistons con-rods. Only use it to fill the carb with fuel and turn it to on or reserve as soon as you can.
If the bike runs using the prime position but will not run when on or reserve, then you may have a vacuum problem or a dodgy tap......assuming you have fuel that is.
Hope that helps.

Sep 14, 2015 | kawasaki KLE 500 Motorcycles

1 Answer

Where can i find the fuel filter on a 1994 gsxr 750


a suzuki gsxr motor bike filter is in the fuel tank , remove tank , remove fuel tap and there you have a filter connected to the tap !! DRAIN TANK FIRST !!

Apr 08, 2013 | Moeller InLine Fuel Filters Replacement...

1 Answer

Which way is reserve on my 06 gsx 750f i don't know which way to point the arrow


my 2003 gsx 600 f katana: dOwN is ON
lEft is rEsErvE,
RIght is pRIme

Sep 16, 2012 | 2006 Suzuki GSX 750 F (Katana)

1 Answer

Where is the prime position on the fuel on a GSX 750 fn


THIS IS QUITE EASILY RECTIFIED, REMOVE THE FUEL LINE FROM THE TAP,SLOWLY TURN THE TAP FROM 1 DIRECTION TO THE OTHER, WHEN FUEL FLOWS READILY FROM THE OUTLET ON THE TAP, NOTE THE POSITION ON THE TAP AS FUEL WILL ONLY FLOW WHEN IN PRIME POSITION. {VACUME TYPE TAP REQUIRES ENGINE TO RUN FOR FUEL TAP TO OPEN, WHEN NOT RUNNING FUEL SHOULD ONLY EXIT THE TAP IN PRIME POSITION). REASON FOR FUEL FLOW WHILE NOT RUNING WITH TAP IN ANY POSITION, COULD BE DIAPRAM FAILURE IN TAP.

Dec 04, 2010 | 1998 Suzuki GSX 750 F (Katana)

1 Answer

Hi, On the fuel tap what is the Prime position function.


You have a vacuum operated fuel tap. It should have 'on' , 'res' and 'prime'.
In the prime position fuel will always flow from the tank. In the other positions the engine must be running to allow fuel to flow. If the bike has been standing for a few days, fuel will evaporate from the carbs and the bike can be difficult to start. By switching to prime for a minute, the carbs are replenished and starting should be easy. Dont forget to return the tap to on or reserve once started.

Sep 06, 2010 | 1997 Suzuki GSF 1200 Bandit S

1 Answer

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

Jul 17, 2010 | 1996 Suzuki GSX 750 F (Katana)

2 Answers

Just got a trophy 3. dont know what position is which on the fuel tap? no markings.


Usually the fuel valve is this
Straight Down = ON
Straight Up = RESERVE
Horizontal/Across = OFF
There may be some difference with the manufacturers, or with custom fuel valves (chrome), also, fuel injected bikes usually do not have reserve or reserve position on fuel valve. If you have fuel injected bike, they do not like to be run out of gas, keep the gas level up.

Jun 24, 2010 | 1995 Triumph Trophy 900

2 Answers

Position on a petcock for a 1994 suzuki katana 600which is on off and prime


I have the same problem on my gsx 600f! there is no markings to say which is ON, or PRIME, or RESERVE on the petrol tap!

I'd like to know before I run out of petrol on reserve!

Is the ON position with the arrow pointing down? lots of people seem to be asking the same thing across the web! Can we have a solution please!!!!

Oct 30, 2009 | 1994 Suzuki GSX 600 F (Katana)

3 Answers

Fuel petcock positions on my Yamaha XJ 600 Diversion S


hi jamie,, as your sat on the bike ,, push the tap down ,the fuel is on,, pull the tap up thats reserve,,turn the 3 quarters round thatl be prime if u have it,, if u do that is purely 4 morning starts,,
u must put tap to on when the bike starts,,if u look carefully mate on the edge of the tank,, there is a arrow head stamped in 2 it,,

Dec 27, 2008 | 1994 Yamaha XJ 600 Diversion S

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