Ken,
I had one screw on mine that was set at 1 1/2 turns from the factory
... with the others at 2 to 2 1/2. The first thing you need to do is
to make sure the screws actually are doing something. You can make
this determination at each cylinder by turning the screw all the way
in. When doing this ... you should notice a significant "change" in
the idle etc ... if not ... then that particular cylinder is plugged
or grossly out of sync. If you discover a "plugged" cylinder .. then
remove the pilot mixture screw for that particular cylinder and put
some compressed air into the mixture screw hole ... If you want to put
some carb cleaner in front of the compressed air ... that wouldn't
hurt either. Once you have "all" the mixture screws making a
contribution ... then close each screw ... until you notice the engine
is suffering ... then back the screw back out 1/2 turn, (this is a
good starting point ). I would suggest you sync your carbs as well ...
and then re-check you mixture screw settings.
When you are through ... I would keep an eye on the condition of your
plugs ... Since you are running on your pilot mixture most of the time
anyhow ... that is what you will be seeing reflected on a casual plug
check .... Although the mixture screw has less impact once the
throttle starts to open you can still make minor adjustments to
equalize plug differences. With the 42.5 pilot fuel jets and the shims
I would watch the plugs very carefully to make sure you don't start
running entirely too rich. If the "Y" is still on the top of the
airbox with this setup ... I can almost guarantee you will be too
rich.
As far a there being a "difference in performance" .. I am not sure
what your expectations are. What you are trying to achieve here is a
suitable pilot mixture combination that will allow the bike to idle
and give reliable off-idle responsiveness ... without a backfire or
stumble and without having to depend on an over rich slide needle
setting to bail it out, (which will then screw up your mid-range
mixture and performance) ... If you achieve this ... then you will be
rewarded with a bike that is easy to keep in tune, (you don't have to
clean the plugs every week) ... will give you great gas economy ...
will be very responsive and generally a pleasure to operate ... IMHO
...
campbell
----- Original Message -----
From: Ken Boerman <[EMAIL PROTECTED]>
Subject: pilot screw setting
> Where are most piolet screws set from the
> factory? How many turns out from the seat?
>
> I have installed 42.5 pilot air jets and shimmed
> the needles .020 and addeded a K&N Filter.
>
> I have tried thepilot screws from 2 turns out to
> 3.5 turns out. And can't see much difference in
> performance.
> snip <
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