Need advise on a crack in a carb

[WeWontBlink]

I recently acquired a 1981 GS750E. Stock air filter, exhaust, and everything else as far as I can tell. It will run, but leaks quite a bit of gas out of the airbox drain tube. I was told it is probably a stuck float, so I pulled the carbs to do a thorough cleaning/rebuild. They were pretty dirty, but most worrisome is a small crack in the #4 carb. The crack is on the tube that the needle valve seat sits in. The crack doesn't appear to extend below where the oring is on the needle valve seat, although that probably doesn't mean much. The needle valve seats were in there pretty tight, so I was thinking this something that could be somewhat common on these. Should I go ahead and finish the cleaning and see how it runs, or is it highly likely that this crack is causing the leaking through the airbox or some other issue? I should add that I have not even ridden the bike. The first thing I did was pull the carbs.

[chuck hahn]

Its just at the top far as I can tell. If its above the spot whrere the oring seats its fine. You can tap the lip back to close upthe crack if it bothers you.

As long as it cant interfere with the oring sealing its of no real concern.

[chuck hahn]

If you feel it will interfere ith the orings sealing, then a little JB Weld. Let sit 24 hrs to cure and smooth off the bore nice so the oring is good again...

[BassCliff]

Greetings and Salutations!!

Hi Mr. WeWontBlink,

Gas leaking from the airbox is usually caused by a faulty petcock, leaking float valves, improper float height, or a combination of the three. See: Overflowing Carbs

I can't speak to how the crack will affect performance. I just know that crack is not supposed to be there.

But I suspect Mr. chuck hahn is correct in his assessment. The worst case would be that you will need a new carb body. But I would button that one up first and see how she runs.

OK, I'll shut up now and just greet you properly with my little "mega-welcome".

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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



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More links to helpful threads in the forum:
Help! Your Bike Won't Start
DON'T DO THESE THINGS
Help! Your Bike Won't Run Well
Oh God! Pods!


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Thank you for your indulgence,

BassCliff

[WeWontBlink]

Thanks for the advise and the mega welcome! I've owned different motorcycles and been a frequent visitor on their respective forums. This one definitely seems to be one of the better ones. Great site, seems like great people, and an absolute ton of info.