Question about 1987 Yamaha YX 600 Radian

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WHEN I PUT MY BIKE IN PRIME POSITION IT LEAKS!!!

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Hi and welcome to fixya,

you'll need to change the gasket of your fuel ****.. or better change the entire fuel valve so save you time from finding the right gasket for the valve.

hope this info helps

Posted on Dec 29, 2010

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Posted on Jan 02, 2017

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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

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

..........my engine oil smell of


if your bike has a vacuum operated fuel petcock on the tank....ensure that it is set in the ON position and not prime PRI position. Often as these age, the diaphram leaks and raw fuel leaks into the vacuum line, into the engine and then crankcase.
You could test by removing the vacuum hose, switching briefly to prime and see if fuel starts leaking out the open vacuum port on the petcock. There are kits to rebuild the petcock...and definitely change your oil and filter to get the contamination out.

Apr 11, 2011 | Honda VTX 1300 S Motorcycles

1 Answer

Hi I have bought a 1985 700 maxim watercooled it has been sitting for appr 2 years today I took carbs out, disassembled them, cleaned them w carb cleaner and put them back in in addition to that I...


If I understand "the petcock was in prime position and it eventually quit dripping."
Prime = on
Sound like the needle rubber was hard and after a while they soften up enough to cut off the fuel.
Keep an eye on it and ride safe.
Ken

Feb 02, 2011 | 1985 Yamaha XJ 700 X Maxim

1 Answer

I hav a gsf 600 bandit year2000 WITH A FUEL STARVATION PROBLEM the bike will run if fuel tap is in prime position but if you turn it to on position the fuel supply stops same on reserve HELP!


Chack fuel filter, maybe it's dirty, plugged or incorrectly positioned. It hase arrow which shows fuel flow direction. Maybe someone put it up side down.

Dec 13, 2010 | 2000 Suzuki GSF 600 S Bandit

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 bike will only run on prime position


Rebuild or replace the fuel petcock.

May 16, 2010 | 1993 Suzuki GSX-R 750 WP

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

1 Answer

The fuel wont go through the lines to get it started


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.

Nov 17, 2009 | 1981 Yamaha XJ 650

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