Re: shut off at high speeds
 

ok so I was fooling with the bike and there is a hose that run out of the front top of the bike that has a bolt in it to plug it up . i dont see where it might have gone to.

when i was looking at the fuel petcock i noticed there is no reserve , you can only turn it to off or on and the off does not work it flows at about half . so it thought maybe i had had the switch on off so i turned it to on and went for a ride , same problem died waited 10 sec and started again . it died again and this time wouldn't start i just pushed it home.

Re: shut off at high speeds
 

Pri
On
Res

These are the only markings on the petcock.

In the on position there should be no fuel coming with the motor off.

Pri lets the gas out to drain or fill the carb with gas, the floats would stop the gas from flooding or overrunning.

Res is the shorter two screen pick-up in the tank.

Does the petcock work as it should??

Re: shut off at high speeds
 

the petcock says off(left) on(bottom) and fuel(right) . it will only turn to off and on and both have flow without the engine on im going to call the PO but i think he'll be clueless

Re: shut off at high speeds
 

Your petcock should have two hoses running from it.your fuel hose,and a smaller one on the back side for vacuum that lets fuel flow when the bike is running.If this vacuum hose is not connected ,the only way you would get fuel is if the petcock is on prime.This vacuum hose must be connected and operating for the petcock to work properly.
:2tup: :)

Re: shut off at high speeds
 

thanks guys .my petcock does look like the one on bikebandit's picture but i only have one hose coming off it the main fuel hose and like i said it says off on fuel

weird sauce.

is my petcock not stock? and where does the vacuum tube go ?

Re: shut off at high speeds
 

The vacuum hose runs from the back of the petcock to vacuum port on carb.If there is not a nipple on the back of the petcock for vacuum hose,than somebody has hooked up a different petcock.Take the hose that you said is blocked off with a bolt,and unplug it with the bike running and see if it has vacuum.I'm betting that it's the hose for the back of the petcock.
:??: O_o

Re: shut off at high speeds
 

yep its sucking in air and I still cant find any place on the petcock to hook it onto

Re: shut off at high speeds
 

I guess i should buy a petcock on ebay?

Re: shut off at high speeds
 

Put GZ 250 petcock in google. it will show you one on this site.

Re: shut off at high speeds
 

ya they dont look like mine and like you said prim on res and mine is off on fuel