I suppose it is possible that worn throttle spindle bushings could allow
mixture to get past the butterfly and hence cause a high idle. But in most
cases a high idle is one or more of several things badly adjusted. Either
the butterflies are not properly seated in the carb throat, or a poppet
valve isn't fully closing, or the spindle clamps are maladjusted such that
one butterfly is fully shut but that is holding the other open, or the
throttle cable is too tight holding the butterflies open even though the
idle screws are backed off, or the fast idle screws are screwed in too much.
Or could be any combination of the above.
The bottom line is that the engine *cannot* run unless a fuel mixture is
passing one or both of the butterflies, for what ever reason.
PaulH.
----- Original Message -----
From: "Christian, Skip" <wellner.christian@navy.mil>
To: "Kai M. Radicke" <kai@radiohead.net>; "MG Digest (E-mail)"
<mgs@autox.team.net>
Sent: Friday, April 09, 2004 11:54 AM
Subject: RE: Carb & Trans Oil Questions
> Then a week later the idle went back up (to about 1300 RPM)
|