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Author Topic: 1978 xs750 Carburetor leaking  (Read 876 times)

Offline Xs7501978

  • Posts: 51
1978 xs750 Carburetor leaking
« on: Jun 30, 2017, 13:15:29 »
Alright....so I bought this xs750 2 months ago and it was perfect. Comepletly restored to the max. The guy said he took apart the engine, carbs, new paint job, everything except the electrical. So of course i bought it for a cheap price of $1000 might seem fake but he had pictures of the processes. but then the next day my bro crashed it. It started after 20 minutes or so and I took it home, we then took everything except the carbs apart and my brother redid the electrics and it had been running fine. Last week it started to drip gas some when I was driving and then after a couple days it started to drain gas so I bought rebuild kits and carb cleaner and went to work. But even now after cleaning it 100% it's still drains when it runs. The float mount is broken on one of them but. That carb isnt acting up so I figure I'm just gonna leave it be for now. I'll add a picture or two so y'all can see the bike and the hole where it's leaking later today. Let me know if ya have any questions, need to get this fixed so I can ride haha.

(Didn't see any categories for this so I just posted here)
It leaks out of the white hole first, then if you plug it. the black, blue and then yellow.. if you plug all the holes the engine starts so sputter. And when you rev it high the leaking sometimes stops.

JUST SO EVERYONE KNOWS WHEN I SAY LEAKING I MEAN IT HAS A CONSTANT STREAM.
Thanks in advance
« Last Edit: Jun 30, 2017, 13:42:58 by Xs7501978 »

Offline datadavid

  • Posts: 1097
Re: 1978 xs750 Carburetor leaking
« Reply #1 on: Jun 30, 2017, 13:51:19 »
Well.. change your float valve assemblies.

Offline Xs7501978

  • Posts: 51
1978 xs750 Carburetor leaking
« Reply #2 on: Jun 30, 2017, 13:53:33 »
Is that the biggest copper piece here? Sorry I'm extremely new to anything mechanical...



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Offline Xs7501978

  • Posts: 51
Re: 1978 xs750 Carburetor leaking
« Reply #3 on: Jun 30, 2017, 14:02:06 »
I've replaced al these parts



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Offline Ryan Stecken

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Re: 1978 xs750 Carburetor leaking
« Reply #4 on: Jun 30, 2017, 14:06:22 »
Remove the floats carefully (there is a tiny axis that holds the float)....be careful the posts on which the axis fixed likes to breql easily and shake the floats...are they full of gasoline?
Next up take every single float and dunk it into a see trough glass full.of water to.see if they are leaky....

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Offline Xs7501978

  • Posts: 51
Re: 1978 xs750 Carburetor leaking
« Reply #5 on: Jun 30, 2017, 14:09:03 »
Yeah ik they break easy because some jackass before me broke one of them, but that one works fine for now and I'm going to buy a new carb body. I'll do those tests though and get back to you.


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Offline Xs7501978

  • Posts: 51
1978 xs750 Carburetor leaking
« Reply #6 on: Jun 30, 2017, 19:13:46 »
Alright so it sounds like there is a little in it and it doesn't float like the rest...could that be the problem with it? I'm gonna swap the one that's leaky with the middle to test.



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Offline Xs7501978

  • Posts: 51
Re: 1978 xs750 Carburetor leaking
« Reply #7 on: Jul 01, 2017, 01:31:08 »
Swapped it with the middle one and it leaked instead. Defenently the problem, already got a new  one ordered. Thanks Ryan.

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Offline Ryan Stecken

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Re: 1978 xs750 Carburetor leaking
« Reply #8 on: Jul 01, 2017, 03:37:18 »
Youre welcome.normally when you do the carbs stick to stock parts (and ultrasonically cleaning them) dont replace stock parts with cheap aftermarket parts if you buy new buy OEM.
If the carbs leak there is a problem with the needle/needle valve/float assembly.
No need to completely rebuild the carbs.Glad you found it.cheers

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Offline datadavid

  • Posts: 1097
Re: 1978 xs750 Carburetor leaking
« Reply #9 on: Jul 01, 2017, 08:27:31 »


Youre welcome.normally when you do the carbs stick to stock parts (and ultrasonically cleaning them) dont replace stock parts with cheap aftermarket parts if you buy new buy OEM.
If the carbs leak there is a problem with the needle/needle valve/float assembly.
No need to completely rebuild the carbs.Glad you found it.cheers

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Yes +1 on that. I would not want aftermarket needle valves anywhere, knowing how fine tolerances are on stock items.
And i would prefer to solder up the leaky float instead of buying aftermarket.