Louis,
The pilot fuel jet, (that you cleaned in the fuel bowl), passes fuel
of course that mixes with air from two different pilot air jets,
(obviously not all carbs have double pilot air jets). The primary
pilot air jet is at the top of the carb, (this is the big one up
there). The secondary pilot air jet is located behind the slide
rubbers at the one o'clock position. The air that passes through the
secondary gets blocked off on deceleration, (to richen the mixture and
prevent backfires etc).
Most importantly though ... the ultimate pilot mixture is introduced
via the pilot mixture screw hole when the plates are closed and as you
open the throttle you draw additional pilot mixture through three
bypass holes that are located just above the throttle plates. If you
opened the throttle plates a little when you were cleaning you would
have noticed a "V" discoloration down the side of the barrel of the
carb, (that you couldn't clean off) ... coming from these bypass holes
... this is what you are running on most of the time and if they are
plugged they will cause the symptoms you have described. Actually, if
you look at the size of the "V" pattern on each carb when you have
them off ... you can tell if someone has been asleep and not
contributing.
What I am suggesting that you do, (and on a routine maintenance
basis), is to remove the pilot mixture screw on each carb ... If you
have not had this out before it is behind a metal plug .. just below
the slide cover ... You can use a small drill ... 1/8 or 3/16 or
thereabouts and they will come right out ...(then you can put a 1/4
inch plastic plug from the hardware store back in there). Also .. if
you haven't had these mixture screws out before ... turn them all the
way in to determine where they were set before removing them, (so you
can put them back the same way ... or the same way "plus" an
additional 1/2 turn). Take them all the way out and using a rubber
blow gun tip ... pressurize the 1/4 inch hole that the mixture screws
sit in ...... Putting air here will be sufficient to clear the mixture
screw hole and the three bypass holes, (that are on the same circuit
... but simply don't have a screw to adjust their flow .. and of
course they don't need one since nothing happens to them with the
throttle plates closed). If you get these paths clear ... I think you
will restore the low end responsiveness ........ These clog very
easily ... and some people with jet kits are running with their
needles extremely high anyhow and as soon as the plates start to open
they are really running on fuel escaping around the slide needles and
the bypass holes aren't doing anything ... which makes for the
occasional backfire when you crank on the throttle and general poor
low end responsiveness.
If you are able to unscrew the pilot mixture screws but are unable to
get them out ... you can use a piece of 1/4 inch clear plastic tubing
... just push it in the hole ... and it will slide over the end of the
mixture screw so that you can pull it out. If this doesn't work ...
put your safety glasses on and put a blast of air in the primary pilot
air jet at the top of the carb ... be sure to have your hand in front
of the mixture screw hole when you do this as they will be ejected at
high velocity, (you need a rag on the top of the carb too ... since
you are likely to get a shot of fuel straight up in the air ... from
the bypass holes that are on top of the throttle plates ..... ).......
campbell
----- Original Message -----
From: louis churukian <[EMAIL PROTECTED]>
Subject: Re: V-Max Carb trouble? Surges, misses and popps.
> TC: You mention two pilot air jets. I only recall one brass jet
and an air
> jet at the top of each carb. Which pilot mixture screw are you
referring to
> remove and blow air thru?
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