carb balance screw adjustment

[Paudie M]

I have removed my carbs. When i moved the throttle spring by hand i noticed the throttle valve wasnt closed fully i could see light coming through.  I adjusted the balance screw to close valves in unison.Also my air vent hose connector was very badly cracked and the air vent hose was missing (parts on order). The reason i removed the carbs wa.s to   check it.i changed the fuel petcock too as my bike would die after 40/50 miles.
What effect would these issues have on the bike?

[RossLH]

If the air vent hose is missing, that could cause the bike to stutter at highway speeds. And if the carbs were out of sync, that'll cause a rough idle and poor low RPM performance.

[Paudie M]

Thanks for that i will report back when i fit new parts.

[Calpantera]

Paudie what were you looking for when you pulled them? I also have a issue with my bike starving and I am trying to chase it down..

[Paudie M]

Calpantera mostly its to do with fuel starvation. First i checked the petcock under the tank which was clean. Then i checked the res/on petcock nothing seemed wrong until i noticed one of the four screws on the back of the res/on petcock was an allen key head when the rest are philips head. I removed all the screws to find the previous owner removed the back cover and damaged the petcock gasket. I have installed a new petcock as this has the vacuum diaphram. While i was waiting on the parts i decided to check out the carbs hence the above post. Whats up with yourbike?

[Calpantera]

It starves out when I am under a lot of throttle on the freeway. I pull over and usually get it going again before I stop rolling. The tank had been coated by the previous owner and it still has all kind of crap rattling around in there. I am looking to just replace it. Also when I pulled the tank I noticed the air filter came apart! See my thread here
http://gstwins.com/gsboard/index.php?topic=61836.msg724512#msg724512
I did notice just yesterday that the previous owner added an inline filter so that made me happy. I was going to pull that carbs next and see if they are clean, I just wanna ride!

[weedahoe]

I recently did a thread on what I used and how I synched my carbs. It made a big difference.

Also, like you, on the road my bike would want to stumble and try to die unless I switched over to PRI. I pulled apart the petcock and cleaned it it runs great now

[Calpantera]

I recently did a thread on what I used and how I synched my carbs. It made a big difference.

Also, like you, on the road my bike would want to stumble and try to die unless I switched over to PRI. I pulled apart the petcock and cleaned it it runs great now

You have a link to that thread or key words? I tried to find it by looking though your posts and there were 43 pages to read through 
I think I am going to go yank that petcock apart..

[RossLH]

Since I recently looked up the very same post for educational reasons....here you go. Very simple and effective method, for the record.

[weedahoe]

Since I recently looked up the very same post for educational reasons....here you go. Very simple and effective method, for the record.

Thanks for the link

@ Calpantera, here are pics of the petcock also

http://sdrv.ms/RgZI1r

[Paudie M]

my bike also dies when i'm using lots of throttle, i have to pull over the same as you. it sucks balls

[salamander]

Also, like you, on the road my bike would want to stumble and try to die unless I switched over to PRI. I pulled apart the petcock and cleaned it it runs great now

If you decide to tear into the petcock to clean it, also check the diaphragm for holes and flexibility.  A diaphragm on its way out, but not completely bad, could give the same -- fuel starvation symptoms at high load, but fixed by slowing down for a time or moving petcock to prime.

Also, make sure the vacuum hose from the carbs to the petcock is not partially pinched off.

[weedahoe]

Also, like you, on the road my bike would want to stumble and try to die unless I switched over to PRI. I pulled apart the petcock and cleaned it it runs great now

If you decide to tear into the petcock to clean it, also check the diaphragm for holes and flexibility.  A diaphragm on its way out, but not completely bad, could give the same -- fuel starvation symptoms at high load, but fixed by slowing down for a time or moving petcock to prime.

Also, make sure the vacuum hose from the carbs to the petcock is not partially pinched off.

If you're talking to me then you're way late. I took it apart, cleaned it out took pics of everything, put it back together and it works like it should.

[salamander]

Weedahoe -- you forget, you give me advice not the other way around  .  What I said was meant more for Paudie and Calpantera -- as long as the petcock was apart, be sure to check the diaphragm as well as cleaning dirty passages.  Issues with either could give fuel starvation symptoms.

[weedahoe]

Lol..... I don't know that much man. I'm just the type though that something only defeats me once

[salamander]

I hear ya.  A long memory's an advantage dealing with any bike.

[BockinBboy]

I did notice just yesterday that the previous owner added an inline filter so that made me happy.

This could be your starvation problem.  That filter may not be the correct type of filter.  Make sure it is one designed for bikes, and if you don't know, just replace with one you know that is... I would say get rid of it alltogether, but it sounds like your tank is pretty bad, and that it is necessary.

- Bboy

[Calpantera]

I did notice just yesterday that the previous owner added an inline filter so that made me happy.

This could be your starvation problem.  That filter may not be the correct type of filter.  Make sure it is one designed for bikes, and if you don't know, just replace with one you know that is... I would say get rid of it alltogether, but it sounds like your tank is pretty bad, and that it is necessary.

- Bboy

Ya I am going to replace it anyway, how hard is it to locate a new petcock diaphragm? Most shop carry it or is it dealer only item?

[craigs449]

I had the same problem with mine after I added an inline filter to the fuel lines......I took them off and she runs just fine now.

[Suzuki Stevo]

See... "Fram Inline filters & Fuel Starvation"