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alantf · 06-03-2010, 01:05 PM

Switched to reserve, then only got 1 more mile out of it?

This seems to firmly point to the fact that the pipe has come off the petcock (in the tank)

What happens is that inside the tank, the petcock has a pipe (open at the top) When in "run" the bike uses fuel until it drops level with the top of the pipe, when no more fuel can go into the pipe. Switching to "reserve" opens an outlet level with the bottom of the tank, which means that the fuel sitting under the top of the pipe can now flow. So,you can see that it's more of a way to let you know that you're low on fuel. If the pipe come adrift, then you are using all the fuel in the tank before it cuts out. You were lucky to get that extra mile. It seems like it's a common fault with the GZ. It's not a difficult job to repair it. It just means removing the petcock, retrieving the pipe out of the tank, & refitting it. You might want to wait until the tank is nearly empty, then set the petcock to "prime" to empty the tank into a suitable receptacle.

BTW if you want to take the tank off to do the job, again, it's really simple. :2tup:

06-03-2010, 01:05 PM	#22
alantf Senior Member Join Date: Nov 2008 Location: Tenerife (Spain) Posts: 3,715	Re: gz250 mileage Switched to reserve, then only got 1 more mile out of it? This seems to firmly point to the fact that the pipe has come off the petcock (in the tank) What happens is that inside the tank, the petcock has a pipe (open at the top) When in "run" the bike uses fuel until it drops level with the top of the pipe, when no more fuel can go into the pipe. Switching to "reserve" opens an outlet level with the bottom of the tank, which means that the fuel sitting under the top of the pipe can now flow. So,you can see that it's more of a way to let you know that you're low on fuel. If the pipe come adrift, then you are using all the fuel in the tank before it cuts out. You were lucky to get that extra mile. It seems like it's a common fault with the GZ. It's not a difficult job to repair it. It just means removing the petcock, retrieving the pipe out of the tank, & refitting it. You might want to wait until the tank is nearly empty, then set the petcock to "prime" to empty the tank into a suitable receptacle. BTW if you want to take the tank off to do the job, again, it's really simple. :2tup: __________________ By birth an Englishman, by the grace of God a Yorkshireman.
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