Carb rebuild

[nyholku]

Hi,

here is looking forward to spring!

Last summer, my first real summer with my Riviera, I had some
engine incidences, the engine stalled/died a couple of times
when I quickly opened the throttle. This is a three carb KBL.

BTW sorry about my vocabulary, I'm Finnish and don't know the first thing
about carbs or boats, but learning fast, outch is that my wallet hurting...

Before I stored the boat away for winter I tried to see into the carbs to
see if the acceleration pumps squirted something, did no see anything
happening inside the carbs when I removed the spark arrestors and
had a mate pump the throttle, so removed the carbs to have something
to do on those long winter nights. Now spring is round the corner
and have not done anything with them.

Ok, so took one of the carb to pieces (well basically just
removed the actual carb from the intake manifold and
opened it up. At this point I realized I don't actually
understan anything about them so stopped and decided to
ask before I break anything (more). Don't know if I should
have removed the intakes with carbs but that is what I did
and now I have one of the carbs in two pieces.

I removed this thing that looks like a rubber piston and
that moves with the throttle, looks like the rim works
as a one way check valve so that it only pumps on the down
stroke or something.

Oh yeah, before I forget, this is a -53 KBL with three Zeniths
and don't anything about the history, if anything has been
ever done to it or how many hours the angine has on it.

Basically I'm asking what I should do next.

Again let me emphizise that I do not know much about carbs
so no thing is too basic to mention.

Should just clean everything up and see if the acceleration
pumps actually do something after that, maybe there is
a duct blocked or somethihg. A little bit of what looked like
brass dust came out from the acceleration pump cylider or
whatever that is called.

What is the recommended cleaning procedure?

Any good instructions for rebuilding the carbs?

I saw from the web that there are rebuild kit for these
carbs, should I just go for it and order them, meaning
spring comes fast and I don't want to waste time if
at the end of the day I need to rebuild them anyway?

I'll end up with a few images.

Here are the two carbs I've not touched.



Here is a side view showing the marking ER4-15



Top view, I guess the protruding pipe is where the fuel should
get injected when accelerating?



And here is the piston with the stuff that came out with it....



So, please, let's hear some words of wisdom.

br Kusti

[dreed]

Here is a copy of the manual for the 150, 450, and 550 series carburetors, along with some written instructions on how to clean it that I printed from a website awhile back.
I hope this helps. Good luck!

[nyholku]

Hi Dreed,

thanks for posting. The ACBS/BSLOL letter is real gem!

I could not find any reference to it on their website though
the actual file is still there.

http://www.acbs-bslol.com/Gadgets/Zenith.htm

Well, no matter, main thing is you posted it here.

Looks very encouraging, especially if the carb adjustment is
that easy as in that letter.

The copies you posted seem to be of a different carb, but
that reminded me that I actually bought this a year ago:

http://www.ccmanuals.crosswinds.net/

and it indeed contains a copy of the Zenith 28 carb I have.

That scan/copy is not too clear and there seems to be a
different one here, so for 5 bucks I'll just go and download
it:

http://www.carbkitsource.com/manuals/ca ... CM514.html

I'll post here as I make progress, thanks again,

wbr Kusti

[dreed]

What is your Hull # ? Mine is 927 and was wondering if this one is a close relative. If so, could you post a picture of the battery box?