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drippy carbs

  • Thread starter Thread starter 82 GS550L Basket Case
  • Start date Start date
8

82 GS550L Basket Case

Guest
We have the bike back together and running, but the carbs are dripping a small amount of gas directly onto the engine.

The carbs were cleaned, rebuilt, and painted by Josh TheCafeKid (and they're beautiful!).
The vent lines are installed according to BikeCliff's excellent "Where do all these hoses go?" tutorial.
The throttle snaps shut when released.
As far as I know, all of the covers are tight, and the drain plugs are secure.

Sorry, no picture. But you can imagine a tablespoon of gas or so puddled on top of the engine when we got out to the bike this morning.
 
it could be the tee joints leaking, the tee's that join the carbs together to supply fuel, a leaky float bowl gasket or an incorrectly set float height.
do you have pipes on the overflow tubes on the bottom of the float bowls? if so they would leak on the floor if it is a float height issue, if no pipes it would leak on the engine.
 
Could be that the bowls and/or the drain screws aren't tightened down, the fuel line itself could be a bit loose.....or, you left the petcock on prime last night. :)
 
Hi,

Is the float height properly set?


Thank you for your indulgence,

BassCliff
 
Lots of ways a carb can drip gas have been mentioned. I think it would be helpful to first try to find where the gas is coming from. With the bike level or on the center stand, wipe them dry and see where the first drip forms. See if you can feel the wetness on the carb to find out where that drip flowed from. Wipe them dry and start again as you track the leak. Maybe even take them out of the bike and hook them up again to ease inspection.

I once used this method to find a cut o-ring on a T I had installed two years prior. (No it didn't leak right away. Probably the cut took a while to grow into a leaking tear.) No amount of cleaning needle seats and checking float heights would have revealed that. If I had disassembled the carbs again and looked at the o-rings, I might not have noticed the cut. I had to track the leak to the point of failure.

Maybe some gunk did get past the screens in your carbs to hold a needle valve open. Maybe your petcock is leaking into the vacuum line. You'll just have to find out.
 
Agemax said:
it could be the tee joints leaking, the tee's that join the carbs together to supply fuel, a leaky float bowl gasket or an incorrectly set float height.
do you have pipes on the overflow tubes on the bottom of the float bowls? if so they would leak on the floor if it is a float height issue, if no pipes it would leak on the engine.
Click to expand...

No lines on the overflow tubes. We'll get those on once we figure out where the leak is. I sure hope its not the Ts. I'd really like to avoided pulling the carbs out, much less pulling them apart.

Larry D said:
Could be that the bowls and/or the drain screws aren't tightened down, the fuel line itself could be a bit loose.....or, you left the petcock on prime last night. :)
Click to expand...

Well, I'm pretty sure the peacock was on Full, not prime. I'm suspecting and I sufficiently tightened hose clamp on the fuel line at the petcock.

BassCliff said:
Hi,

Is the float height properly set?
Thank you for your indulgence,

BassCliff
Click to expand...

Sadly, we did not verify the accuracy of the float settings or anything else when we got the rebuilt carbs back from Josh. That will be checked if we have to pull them, right before we put drain lines on.

tom203 said:
Make sure petcock is not leaking at tank mount.
Click to expand...

I think this is probably it. at least I hope this is it.

Dogma said:
Lots of ways a carb can drip gas have been mentioned. I think it would be helpful to first try to find where the gas is coming from. With the bike level or on the center stand, wipe them dry and see where the first drip forms. See if you can feel the wetness on the carb to find out where that drip flowed from. Wipe them dry and start again as you track the leak. Maybe even take them out of the bike and hook them up again to ease inspection.

(snip)

Maybe some gunk did get past the screens in your carbs to hold a needle valve open. Maybe your petcock is leaking into the vacuum line. You'll just have to find out.
Click to expand...

yep, troubleshooting 101. now I have some great suggestions to tell Tanner where to start.

I will update when it's solved. or not, if we can't figure it out.
 
Sorry for the lack of updates - Tanner has been making up for "lost" time - he presented his project to the class on Wednesday and has been spending time hanging out with friend instead of working on the bike.

He's a bit burnt out, after the past month-long push, where it seemed like every waking minute was spent on the bike or in school.

We're going to try to get overflow/drain hoses on the carbs tonight or tomorrow.
 
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