Question about 1993 Suzuki GSX-R 750 WP

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My bike will only run on prime position

My bike will only run on prime

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Rebuild or replace the fuel petcock.

Posted on May 16, 2010

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Posted on Jan 02, 2017

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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

What position should the fule petcock be in when running. vertical or horizontal?


It can depend on the type of bike but usually verticle or down. Straight down (6 o'clock position) -- Normal
- keep at normal position when bike is on and off unless special circumstances require use of the following two positions.
3 o'clock position -- Prime
. - use if you need a steady unrestricted gas feed/flow, usually used when there's trouble starting or gas line was disconnected, etc...basically whenever you feel there's need to use it ( beware it can flood the engine as well as leak if left on too long
9 o'clock position - Reserve
. - usually used when running low on gas, helps get the last bit of gas to make it to a gas station....ive also used Prime in some instances when I ran low on gas and the bike wasnt getting enough gas in the normal position.

Hope this info helps,
safe riding - Shays

Aug 26, 2014 | Motorcycles

1 Answer

2005 Dyna Superglide laid it down on the brake side bent up my handbrake and my foot brake other than that maybe a mirror got scratched nope problems with it other than that picked it up when to start it...


Turn key,listen to the whine of the fuel pump priming,start bike. If you don't get the sound of the pump priming either it's not getting power or it's dead, I don't think it has a inertia safety switch.
OR
the crank sensor is the only sensor that, if faulty, will not allow a bike to run. However, even with a bad CS the bike should still 'prime' when you turn ignition on and switch to the run position.
( if it doesn't, I'd look for power to the pump)

Nov 18, 2013 | Cars & Trucks

1 Answer

What is prime on petrol tap on bandit 600 1997.what position should arrow be pointing for on /off/reserve.cheers bandit.


Prime is for when you have taken the carbs off and need to fill up the float bowls.And your arrow should be pointing to ON when your driving the bike. Usually this is UP or to the rear of the bike on most bikes if it doesnt have a engraving on the petcock to show you.you can also check an owners manual online for the correct position.

Aug 02, 2011 | 1997 Suzuki GSF 600 S Bandit

1 Answer

1981 yamaha 650 what position should the petcok b in? pri res oo on


Fuel petcock position depends entirely on what you're doing with your bike at the time.

In normal use, the fuel petcock should be set to the "on" position and left there. In that position, gasoline will be drawn from the tank only when the engine is running and generating vacuum. This prevents overfilling the carbs when the bike sits.

When you're riding the bike and it starts to sputter, it's time to move the petcock to the "reserve" position so that you can use the last few drops in the tank (on a 650 special, this was either .3 or .5 gallons--can't remember which off the top of my head) to nurse your bike to a gas station. Once you've filled the tank, move the petcock back to "on." The bike will still run fine if you keep the petcock in the reserve position, but when it starts to run low on gas--well, you won't have that emergency reserve to get yourself to the gas station.

If you've managed to run the bike out of gas completely, or if you are getting the bike ready for service after having drained the carbs for the winter, you'll need to move the petcock to the "prime" position for a few minutes. This by-passes the vacuum line cutoff mechanism and lets gasoline flow until the carb floats shut off the fuel valve (this is also how all older motorcycle fuel petcocks operated). A sticky float or poorly sealing float valve in the carb can, however, cause far too much gasoline to drain into the carbs (and into the crankcase, if you're particularly unlucky), which is why you should not leave the petcock in the prime position for an extended period of time.

Some Yamaha XS650 motorcycles (can't tell if that's the model you have) have a tank with two fuel petcocks, one on each side, to fuel each carb. If you have a tank with this setup, be aware that setting one fuel petcock to "prime" will affect both cylinders, as there's a crossover tube to equalize fuel levels between the carbs. Also, for reasons I could never figure out, on one XS650 I owned, moving either petcock to "prime" permitted fuel to flow on a gravity feed out of both petcocks simultaneously. I could never figure out exactly why it was doing that.

Jun 06, 2011 | Yamaha XS 650 G Motorcycles

1 Answer

I ran out of gas, now it won't start. what do i do?


Okay....I think your bike may have a vacuum operated fuel petcock.....which is the fuel valve on the bottom of the tank. It shuts the fuel off automatically when the engine stops and the hose from the intake to the side of the petcock loses vacuum.
So when you restart the bike the petcock is closed till the engine starts...which is okay because there is a small amount of fuel in the carb.........until you run out of gas....then the engine quits and the carb is empty.
To handle this situation, typically there is a prime position on the petcock that allows flow without vacuum to "prime" the empty carb......usually marked as PRI on the petcock,
So rotate the lever on the petcocck to prime....wait a couple minutes....get the bike started and set the petcock back to the normal setting....don't leave it on PRIME as fuel may flow overflowing the carb.

Apr 04, 2011 | 2007 Yamaha XT 125 X

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

2 Answers

Just bought a 2007 Honda Shadow VT 600 and had fuel pump off for transport. Got home, forgot to turn fuel line on, and started the bike. It ran for a few seconds, then died. Tried to start it a few more...


is the tank fawcett workin--is the pump producing-is there a hindrence in the line--is batt at 12v-and gettin spark to pistons-chec plug cables and whole ignition for operation and good connections

Apr 14, 2010 | 2001 Honda VT 600 C Shadow

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