Theres one pipe that comes from carb and ends close to shock) and it leaks gasoline all the time when engine runs, does it aswell when its off and petcock is on pri position

Its from that Fuel line which connects both carbs, cleaned carbs with pressured air but didn't work

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that looks like the main fuel inlet for the carbs. I don't really get your hose routing, but if it's leaking there, then really the best solution is to replace the fuel hose and consider putting a wire-type clamp on it if it continues to leak.

clamp like this:


There's also an overflow hose, and I am not 100% sure from your picture that you are not talking about that one. If so then you need to also figure out why it's overflowing, which is a likely stuck float needle.

I hope you didn't just blow compressed air into the carbs through the fuel inlet with them installed on the bike. You can (and should) use compressed air to clean the carb with it torn down on the bench, but there are a lot of delicate parts in there either held in place by gravity or a tiny amount of spring tension or just friction of an o-ring that will be knocked loose or ruined by blowing compressed air into the carbs while they are assembled. All of that stuff is intended to only hold fuel pressure from gravity alone which is about 15psi. Much more than that and you break things.

Quote from: mr72 on June 25, 2018, 06:30:26 AM
that looks like the main fuel inlet for the carbs. I don't really get your hose routing, but if it's leaking there, then really the best solution is to replace the fuel hose and consider putting a wire-type clamp on it if it continues to leak.

clamp like this:


There's also an overflow hose, and I am not 100% sure from your picture that you are not talking about that one. If so then you need to also figure out why it's overflowing, which is a likely stuck float needle.

I hope you didn't just blow compressed air into the carbs through the fuel inlet with them installed on the bike. You can (and should) use compressed air to clean the carb with it torn down on the bench, but there are a lot of delicate parts in there either held in place by gravity or a tiny amount of spring tension or just friction of an o-ring that will be knocked loose or ruined by blowing compressed air into the carbs while they are assembled. All of that stuff is intended to only hold fuel pressure from gravity alone which is about 15psi. Much more than that and you break things.

Guess its the overflow hose, since its kinda hard to change line routing while driving, checked needles and they were okay, moving normally. Though, i found one spring from the ground, guess it fell off when i disassembled carbs, it's about 0,6inches wide and 1inch long. Anyone got idea where its from?

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That looks like it's the overflow hose. Does it connect to anything at the other end or is it split and leaking somewhere along its length?

My carbs had fuel leak from the overflow hose when I had an issue in the float bowl.

Quote from: Meukowi on June 25, 2018, 07:20:47 AM
... checked needles and they were okay, moving normally ...

If that is the overflow hose, check the carb's float heights using Kerry's method (http://www.gstwin.com/float_height_check.htm), or by checking the floats using the service manual method. If using Kerry's method do it with the petcock in prime to allow fuel to flow and be stopped by the float assembly (if it's working).

Have you also noticed any fuel in your airbox, or just from that hose?

Quote from: max on June 25, 2018, 02:05:00 PM
That looks like it's the overflow hose. Does it connect to anything at the other end or is it split and leaking somewhere along its length?

My carbs had fuel leak from the overflow hose when I had an issue in the float bowl.

Quote from: Meukowi on June 25, 2018, 07:20:47 AM
... checked needles and they were okay, moving normally ...

If that is the overflow hose, check the carb's float heights using Kerry's method (http://www.gstwin.com/float_height_check.htm), or by checking the floats using the service manual method. If using Kerry's method do it with the petcock in prime to allow fuel to flow and be stopped by the float assembly (if it's working).

Have you also noticed any fuel in your airbox, or just from that hose?

Yeah, theres a hose from airbox too, which leaks gas, not as much tho as from the overflow hose, which leaks basically straight to ground

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Quote from: Meukowi on June 25, 2018, 03:16:14 PM
<Snip>

Yeah, theres a hose from airbox too, which leaks gas, not as much tho as from the overflow hose, which leaks basically straight to ground

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The carbs are overflowing in that case and it's very likely to be the floats. Do those float height tests I mentioned and let us know how they go.

For the sake of completeness, it's also worth making sure that your tank's breather isn't blocked and pressurising the tank.

You're also likely to have fuel in your oil now too so check its level and ideally change it.

Quote from: max on June 25, 2018, 05:02:08 PM
...your tank's breather/overflow hose isn't blocked and pressurising the tank.

The overflow hose is outside of the rubber seal on the tank cap, it doesn't allow air into the tank so break any vacuum, which is controlled  from a channel in the cap itself which is closed off with a one way ball bearing valve and spring.

Quote from: max on June 25, 2018, 05:02:08 PM

Quote from: Meukowi on June 25, 2018, 03:16:14 PM
<Snip>

Yeah, theres a hose from airbox too, which leaks gas, not as much tho as from the overflow hose, which leaks basically straight to ground

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The carbs are overflowing in that case and it's very likely to be the floats. Do those float height tests I mentioned and let us know how they go.

For the sake of completeness, it's also worth making sure that your tank's breather/overflow hose isn't blocked and pressurising the tank. Just pour some fuel into the hole in the tank's rim and ensure it exits the hose below (or out the bottom of the tank if there's no hose).

You're also likely to have fuel in your oil now too so check its level and ideally change it.

Now i've done it, at the left side the gas went about to the top of the float chamber, and right one stopped at about the bottom of the chamber

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Quote from: Meukowi on June 26, 2018, 02:41:03 AM
Now i've done it, at the left side the gas went about to the top of the float chamber, and right one stopped at about the bottom of the chamber

Either the float levels are way wrong, or more likely, the float needle valves are screwed up ... one is stuck open and the other stuck closed.

And on top of that are you leaving it parked on PRI ? if so, don't.

Quote from: user11235813 on June 25, 2018, 09:53:40 PM
<Snip>

The overflow hose is outside of the rubber seal on the tank cap, it doesn't allow air into the tank so break any vacuum, which is controlled  from a channel in the cap itself which is closed off with a one way ball bearing valve and spring.

Ah of course! I'll correct my previous post, thanks.

Quote from: Meukowi on June 26, 2018, 02:41:03 AM
<Snip>

Now i've done it, at the left side the gas went about to the top of the float chamber, and right one stopped at about the bottom of the chamber

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They should both be level.

Sounds like it's definitely worth opening the carbs up and checking the float heights as per the service manual, or as mr72 said, the float needle valves or seats may be functioning incorrectly.

Quote from: max on June 26, 2018, 10:34:15 AM

Quote from: user11235813 on June 25, 2018, 09:53:40 PM
<Snip>

The overflow hose is outside of the rubber seal on the tank cap, it doesn't allow air into the tank so break any vacuum, which is controlled  from a channel in the cap itself which is closed off with a one way ball bearing valve and spring.

Ah of course! I'll correct my previous post, thanks.

Quote from: Meukowi on June 26, 2018, 02:41:03 AM
<Snip>

Now i've done it, at the left side the gas went about to the top of the float chamber, and right one stopped at about the bottom of the chamber

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They should both be level.

Sounds like it's definitely worth opening the carbs up and checking the float heights as per the service manual, or as mr72 said, the float needle valves or seats may be functioning incorrectly.

Well, it was not on center stand, leaning left, so maybe it had an affect on the gas level, and ofcourse.. i never use pri, except when carbs are empty, eg. When out of fuel and changing to res, i use pri for a few seconds to fill up

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