Leaking carb bowl - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 02-18-2018, 12:51 PM Thread Starter
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Leaking carb bowl

Well, with spring approaching I've decided to get my Vulcan ready. While trying to start it, I've noticed the right side carburetor bowl is leaking a decent amount of gasoline. So I'm wondering, on the 750's, would I be able to just remove the bowl on the bike to reseal, or does the entire carb have to come off?
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post #2 of 9 (permalink) Old 02-18-2018, 03:09 PM
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People have changed jets with the carbs installed, some switch the screws for hex heads to make that easier. Just have to be careful about stripping the phillips heads getting them loose. Seems more tedious than carb r&r if you are earshaved.

I've always advised against using any sealer on carbs. If it squeezes out, it migrates into the passages and won't always clean out. It's also a nightmare on automatic transmission pans when the happens. Sealer can be applied sparingly, but I always avoid it on carbs. However, it looked like there was sealer used on my carbs previously, not silicone, but something like Indian Head shellac that sets hard, maybe Yamabond, not sure. I reused my gaskets and just flaked off the sealer.

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post #3 of 9 (permalink) Old 02-18-2018, 06:22 PM Thread Starter
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So essentially, it is very possible to replace the bowl gasket without removing the carbs? And nothing will fall out that I'll have to pop back in place, correct?

Guess I'll have to order the gasket next time I stop by the bike shop.
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post #4 of 9 (permalink) Old 02-18-2018, 09:57 PM
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I just rebuilt both carbs. The float valve is held to the float with a small clip. The float is held into the bowl with a small pin. Nothing will fall out. I pulled the entire assembly and then pulled them apart on a bench, but I don't imagine it being very easy to get in there and replace an o-ring between the cylinders.

The seal is a plain old o-ring. 54mm ID x 2mm thick x 58mm OD. There are some buna-n 70D ones on McMaster. part# 9262K533, $16 for a pack of 25. Better than the $10/ea from most places, and you'll have spares to clutter up your toolbox.
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post #5 of 9 (permalink) Old 02-18-2018, 10:41 PM
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Meant to mention this and forgot....

If it's leaking between the carbs, that's the float chamber, and the carbs have to come off and be separated. That's where the round o-ring is.





The jets are in the bowl section pictured below and have the o-ring in this shape at the bottom of the carb. This can be removed with the carbs on the bike, with some effort. The gasket embeds in the bowl/cover.



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Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 02-18-2018 at 10:44 PM.
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post #6 of 9 (permalink) Old 02-20-2018, 11:48 PM
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A touch of superglue at the corners will keep a plain o-ring in the groove while you maneuver the cover into place.

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post #7 of 9 (permalink) Old 02-21-2018, 01:20 PM
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With o-ring cord, you can make your own. There's even a kit with assorted sizes and a jig to help make a good square cut and hold the ends for applying the super glue. Or as mentioned, just cut an o-ring and spot glue it to the odd shape.




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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #8 of 9 (permalink) Old 02-21-2018, 02:12 PM
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For the odd shaped gasket/o-ring sealing the jet cover, part number is

92055-1290 -or- 92055B

Available from Partzilla for ~$9/ea + shipping

definitely an expensive part for an o-ring, but worth it IMHO

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post #9 of 9 (permalink) Old 02-23-2018, 01:01 PM
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I removed my bowls and resealed with red gasket stuff with no issues.

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