<VV> Carb break down and diagnosis
tony.underwood at cox.net
Sun Oct 18 16:53:21 EDT 2009
At 01:41 PM 10/18/2009, Stephen Upham wrote:
>Actually, the more I look at the idle circuit tube, the more I'm
>convinced that a) there never was an obstruction or b) that I have
>removed the obstruction without actually seeing it.
>I have been able to see a good deal of light though the tube since
>its removal. This was the first test that I performed. The beam of
>light at the end of the tube appears to be nice and circular. There
>is absolutely no visible debris in the tube. I'm seriously
>considering putting it back together and see what happens.
Before you do, don't forget to check out that other part of the idle
circuit that runs through the carb body down to the mixture screw and
the discharge port. The air bleed is only a part of it. There's
more plumbing down below. That's the area that usually ends up with
debris stuck in it since fuel flows through it, while the venturi
cluster air bleeds only pass just that, air.
If you have a piece of trash stuck in that idle mixture passage
somewhere, fixing or even replacing the venturi cluster still won't
help you. Blast come carb cleaner through those idle mixture
passages and make really sure they're clear of anything that could
restrict flow through them. If it were me, that's where I'd be
looking for what's been troubling you.
I've had luck blowing carb cleaner through the idle mixture screw
hole while blocking the discharge ports in the venturi with a finger,
to force cleaner backwards through the passages and blow it all out
through the jet and cluster plumbing.
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