Ken,
Your right of course .... something should change when you turn the
mixture screw all the way in. I think one of the first things I would
check is the sync on these carbs to make sure this one isn't
completely closed at idle. When the bike is at idle there is of course
a slight amount of air that makes it past the throttle plate. The
mixture that you are running on through the pilot mixture screw
consists of fuel from the pilot fuel jet in the fuel bowl, (sounds
like you might be getting that); mixed with air from the primary pilot
air jet at the top of the carb .... air from the secondary pilot air
jet located behind the slide rubber and air from the bypass holes that
are located just above the throttle plate, (when it is closed). The
bypass holes will start venting pilot mixture as the throttle plate
passes them but when the plate is closed they suck in air.
If any of the air passages are closed or blocked they will make this
mixture very rich ... and as long as the throttle plate is reasonably
closed it will not be able to steal mixture out of the needle jet
..... Anyhow ... I would do the sync for sure ... and if you haven't
done so ... go ahead and blast some air in the PAJ2 behind the slide
rubber .... to free a coasting enrichment valve that might be stuck
shut. If you put compressed air at the PAJ1, (the big jet at the top
of the carb), it should blow fuel out of the bypass holes just above
the throttle plate ..... (this will prove the path is open ... but put
your safety glasses on) .... I assume you have changed the plug or
swapped it with one from a cylinder not having this problem.
campbell
----- Original Message -----
From: "Ken W. Manz" <[EMAIL PROTECTED]>
Subject: Carb problem for Tech. List
> snip <
> Carb #1 does not react when you turn in the pilot screw all the way.
> snip <
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