Ebbie, and A and C,
Don't worry, I do in fact use 1/4 inch open. However, this is a verbatim quote from the POH (if I could work out how, I'd post a scan of it):
(Pages 41-42)
D. Starting Engine when Cold
...
4. Throttle Control - pump throttle full open and closed 2 to 3 times then set control 1/4 open.
I guess it's a misprint. The POH is typed, due to the age of the ac.
Tim