<VV> exhaust afterfire "BANG"

[Andy Clark]

Sounds like the idle SPEED screw is backed out on that carb. If so the idle
MIXTURE screw will have little or no effect.
Try balancing the carbs with your Unisyn before proceeding.
Andy Clark
Camano Island, WA.
66 140/4 Monza Sedan
66 140/4 Stinger Clone
66 180/4 Cord 8/10 #60
----- Original Message ----- 
From: "Michael Kovacs" <kovacsmj at sbcglobal.net>
Sent: Thursday, January 05, 2006 2:11 PM
Subject: <VV> exhaust afterfire "BANG"


> I'm looking for advice on an after fire. The 140 "pops" about every 10-20
seconds after being thoroughly warmed up and just idling. I'm assuming it is
an rich condition that allow a too rich mixture to build up in the muffler
and then bang when conditions are ripe.
>
>    The choke on the primary carb is fully open and the secondary is
drawing no air that can be measured with a unisync.
>
>    Possible cause? The idle screw does not seem to have any effect either
backed out 4-5 turns or lightly against the seat. This seems to be a new
problem. The car gets very little use and only has 5,000 miles in the last
25 years, but the carbs were rebuilt 3 years ago.
>
>    I just changed out the carb off one other operational 140 ,but haven't
been able to drive it (to really warm it up) due to the slushy road
conditions.
>
>    All analysis accepted.