Carb crud

[amuller]

I opened a carb this evening and the bowl was loaded with maybe a heaping tablespoon of what looked very much like damp brown sugar. I’ve never seen anything like this in a carb before. Is it unusual? Also noticed that the bowl was stuck on tight, such that it required definite effort to get it off. Gasket was a plastiky material.

[david-bartlett]

Been there and seen that! I don’t know what the cause is, but I have had good luck getting it all out. Almost like sand.

[fisherman6]

Yup, I have seen it too. That’s quite a lot of it but I have seen it in a number of carbs I have worked on. I’m not quite sure what it is either. Looks like it may be some congealed varnish bits or something. I have been soaking all my carbs in Berrymans Chem Dip for 30-40 minutes now then flush them out with spray carb cleaner and compressed air. I have had good success with this so far.
-Ben

OldJohnnyRude on YouTube

[amuller]

This morning I tried dissolving the stuff in E-85 (ethanol), E-10 (normal gas) and acetone. So far It doesn’t entirely dissolve in any of those. Given that the filter had been bypassed I’m wondering it some of it is just dirt (sand). The liquids turn yellow so clearly some is going into solution.

On soaking in carb cleaner, somewhere recently I read a service bulletin (or something) saying not to do that as it would remove an anti-porosity coating from the carb castings. The advice basically was just carb cleaner spray and compressed air.

What say you experts on this?

am

[frankr]

BRP says not to soak their late model carburetors because it removes the porosity sealant. Not an issue if you are working on our old stuff.

[crosbyman]

http://s1088.photobucket.com/user/1cros … t=2&page=1

see crud inside a CD… I used a small nylon brush and pine sol to clean everything out.

Joining AOMCI has priviledges 🙂

[amuller]

Wow, that carb was nasty! I didn’t think of using PineSol. Will try that next time.

I notice you used vinyl fuel lines. Have you found them to hold up well?

That motor looks great!

am

[crosbyman]

I used plastic tube sold as fuel line for motorbikes…so far so good

but I think the blue or yellow tubing could be a better choice

just soak the carb in 50/50 solution for an hour then scrub the crud out
clean all passages with carb cleaner and blow dry with high pressure air

Joining AOMCI has priviledges 🙂

[PugetSoundBoater]

Frank -the later carbs..would that include my 1989 9.9? Of course i won’t soak the plastic top or bowl . I planned on using the OMC Engine Tuner for a good soak on the metal parts and rinse well with spray gumout,blow dry with air .A photo in the 89 manual shows them spraying Gumout.
Monkey see, monkey do.

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson

[frankr]

I plead ignorance on anything that new. The only ’89 manual I have is for larger motors, and it says not to soak them. I will say that it makes sense that they may impregnate the castings with a porosity sealant. We did that with certain parts when I worked at Hynautic (hydraulic steering mfr). On the other hand, unless there actually is a porosity situation with your particular one, the sealant does nothing. Feeling lucky?

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