YS-91 AC Gremlin

[Troy Newman]

Yes,

richen the air bleed screw on the throttle barrel. In is Rich and out is 
lean. The idle set screw is an air bleed...which is basically a hole in the 
butterfly oposing the Carb inlet. By closing this hole down it makes the 
mixture richer as less air leaks past the screw that closes the hole. 
Leaning it opens this open....

So my suggestion is to richen (cw rotation) on the screw about 1/4-1/2 
turn...If it still doesn't kill it then go in again....If you bottom this 
screw out and it still doesn't die on its own then its leaking someplace 
else...

Also as for idle adjustment this will richen the bottom end...I doubt 
seriously if you see be able to see the difference....The air bleed screw is 
really not very critical....I shoot for a fairly rich low end. It would not 
stumble coming up but will not jump to 9000rpm in 1/2 sec either. Kind of a 
roll effect that is smooth. The mid range and the transition is more 
effected by the pressure regulator and not this idle screw.

Let me know if I can help further

Troy


>From: Larry Caldwell <4larryc at bscn.com>
>Reply-To: discussion at nsrca.org
>To: discussion at nsrca.org
>Subject: YS-91 AC Gremlin
>Date: Sun, 30 Nov 2003 18:54:15 -0600
>
>I have a low time 91AC with a new problem I haven't been able to track 
>down.  Good idle at 2,000, good transition, plenty of power.  It won't shut 
>off with the throttle.  It will go to a real slow idle, maybe 1700, and 
>stay there.  If you leave it there 2 or 3 minutes, it will eventually quit.
>
>I noticed the o-ring on the bottom of the air chamber didn't look like it 
>was well seated and thought that might be the problem, but it wasn't.
>While I had the air chamber and carb off I looked at the gaskets, and 
>visually at least they are ok.
>
>Any suggestions would be very much appreciated.
>
>Larry Caldwell
>
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