Slime in Carbs/Fuel diaphram?/Gaskets - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 05-05-2009, 11:45 AM Thread Starter
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Slime in Carbs/Fuel diaphram?/Gaskets

I pulled the carbs off the parts bike to clean them. (I'm also rejetting.)

I found rust colored slime in the carbs and they're gunked up pretty good.

Some of the deposits are white and chalky, some are rusty and slimy. The carb cleaner I have works well on the rusty slimy varnish, but not so much on the white chalky stuff.

Any suggestions on how to get that white stuff off?

***

Also, it looks like my rubber diaphrams (not the vac diaphrams, but the ones on the sides of the carbs) are super soft, almost spongy.

Anyone have any experience with these things? Should I replace them? What do they do?

***

Lastly, since I'm trying to do this on the cheap, can I use some blue RTV silicone to help out my generally flat O-rings on the carb bowl?

Scheherazade
'86 VN750
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post #2 of 5 (permalink) Old 05-05-2009, 12:21 PM
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Quote:
Originally Posted by skalding View Post
I pulled the carbs off the parts bike to clean them. (I'm also rejetting.)

I found rust colored slime in the carbs and they're gunked up pretty good.

Some of the deposits are white and chalky, some are rusty and slimy. The carb cleaner I have works well on the rusty slimy varnish, but not so much on the white chalky stuff.

Any suggestions on how to get that white stuff off?

***

Also, it looks like my rubber diaphrams (not the vac diaphrams, but the ones on the sides of the carbs) are super soft, almost spongy.

Anyone have any experience with these things? Should I replace them? What do they do?

***

Lastly, since I'm trying to do this on the cheap, can I use some blue RTV silicone to help out my generally flat O-rings on the carb bowl?

The white chalky stuff is corrosion from the aluminum, use a tooth brush or as small brush.

Diaphrams will be fine as long as there are no holes. They meter your fuel by adjusting to the amount of air coming in.

RTV will only last a day or two before the fuel dissolves it. Get new o-rings 0r use Permatex Moto Seal, Permatex Hylomar, or Permatex 97 Super High Tack. Basicaly any sealant that is fuel and solvent resistant.


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Last edited by lance328; 05-05-2009 at 12:24 PM.
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post #3 of 5 (permalink) Old 05-05-2009, 01:44 PM
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I believe the corrosion on the aluminum is from water getting into the carbs and sitting. Condensation can cause the same thing. The rust colored slime sounds like varnish forming but not hardened. Both good examples of what can happen when a bike is parked with no seafoam in the gas for a long time.

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post #4 of 5 (permalink) Old 05-05-2009, 03:32 PM Thread Starter
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Thanks guys!

Scheherazade
'86 VN750
MF Battery, Iridium Plugs, RR relocated, Voltmeter, 170/80/15 Kenda Kruz rear tire, DIY Samsonite hard bags, DIY shaved seat with Beaded seat pad ('cause that's how I roll) and the dreaded STATOR CHANGE.

Shining Black Bess '86 VN750, retired for parts after a fried stator and being knocked (kee-runch) in her parking spot.
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post #5 of 5 (permalink) Old 05-05-2009, 08:46 PM
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The guy I bought my bike from tried to silicone seal the carbs once. And while he could wipe down the extra "ooze" on the outside, nothing could be done about the "ooze" on the inside.

When I open my jacked up carbs to clean and repair them, little chunks of silicone sealer were everywhere inside of them.

I'd suggest you just spring for new o-rings, (if they're in bad/questionable condition) but that's just me....

Last edited by 750Doug; 05-05-2009 at 08:51 PM.
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