<VV> Carter YH choke "blink"

[BobHelt at aol.com]

Doug, 
Something doesn't sound right. Once the engine is warm, the coil is out of  
play and the vacuum holds the pull-off and the choke open. Now if an  
acceleration is called for, yes the vacuum lowers and the pull-off is not held  
as before, but the choke remains open since the plate is off center and the  
airflow (and increased airflow) keeps the plate fully open. so I don't see  
how a blink, or much of one, can occur. 
 
However during warm up, the choke plate is held open by the pull-off until  
the coil further opens the plate. if however, the engine is accelerated at 
this  time the pull-off will allow the choke to slightly close because of 
the  lower vacuum. At the same time the choke plate will counteract this by 
tipping  slightly open because of the increased airflow, thus likely 
preventing a blink.  Maybe this can cause a cough????
 
Regards,
Bob Helt 
 
In a message dated 8/29/2010 2:15:08 P.M. US Mountain Standard Time,  
dougmackintosh at yahoo.com writes:

As to why I think the blink happens when the choke is fully open, in a  VV 
response to a query about a cough on acceleration, Craig Nicol said  
"Acceleration enrichment in the YH happens through the usual accelerator pump  
squirt, but that is the secondary system.  The primary system is the  choke 
plate, which for lack of a better term, "Blinks" for a moment when the  engine 
vacuum drops at the sudden opening of the throttle. After that, the  pump 
shot occurs, which continues the enrichment." I don't think there was any  
suggestion that either the problem or the cause were restricted to cold engine  
conditions.