To clean a carb, sprays are pretty futile unless the contamination is
very fresh. NAPA auto sells a gallon paint can of REAL solvents that
comes complete with a strainer basket. remove anything from the carb
that is not METAL, as this stuff will soften or melt all plastics and
gaskets. Soak the carb, jets, and other metal parts for an hour or two
and they will be CLEAN. The price will scare you, but you can clean many
carbs with it. I've had situations where I cleaned a carb and the crap
in the fuel tank re-clogged it almost immediately. It doesn't take much
to plug a jet. A brand new carb won't run any better than a 30 year old
one, if there is crap in the fuel. Off brand filters such as Fram,
(especially Fram!) often supply their own contamination as they
disintegrate.
Bill Bina
On 8/20/2013 10:08 AM, Michael Brown wrote:
I would advise getting a professional rebuild done if the advice here
does not help.
There are some other things you could try, such as spray or liquid
cleaners, but the
residue will go through the engine. The Atomic 4 does not have high
compression
or cylinder temperature so those chemicals are going to get to your
exhaust hose
or possibly past the rings. Maybe not, but I would not risk it. It is
easy to remove
the fuel pump water settling cup, partially fill it with carb cleaner,
and then idle the
motor. That will clean the idle circuit reasonably well.
The chemicals used at a rebuild shop will clean all the gum and
varnish off.
A spray just is not strong enough and does not sit concentrated long
enough.
A rebuild should also include adjusting the carb on a wet flow bench.
The shop
will use the flow bench to set air/fuel mixture to spec usually at a
few points,
1) on choke
2) idle
3) wide open throttle
They will also know if the carb is not adjusting correctly, something
very hard to
guess at when trying it on a live engine.
The Zenith carb on Windburn was rebuilt by Carburetor Rebuilders
Company Limited
in Toronto for about $200. They are at:
http://www.carbrebuilders.com/
Mike
C&C 30
Windburn
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