All - thanks immensely for the suggestions. I did not
replace the larger hoses with the clamps on them. I
do believe they probably need replacement too as did
the other hoses. don't have ready access to a vacuum
tester, but always wanted to get one, and now I have
an excuse.

I haven’t looked at the warmup valve yet, but will take
A closer look at it when I replace the larger air hoses.

Tom – thanks for the pic. I am turning the screw you’ve
dentified and it has very little effect. As a matter of fact,
it’s bottomed out and the idle still is at 1400 rpm.

Chuck – I appreciate the offer of the k-jet manual. I’ll send you
my email address and see if I can handle the big file. I
think I can. Also, if the throttle plate is the circular plate inside
the throat (similar to the choke on a normal carb) I did clean it
with some Sea Foam. It appears to me that, at idle the plate
that I’m thinking of is virtually closed. When throttle is applied
it opens and when the throttle is released it closes again. I
thought that was a little strange because I’m familiar with
gas engines that after warmup the throttle/choke place goes to
open. Is this called the “throttle plate”?

230/8 thanks for the pointer to the AAV. Given what I’ve
heard for suggestions so far, I’ll check that too after I've
gone through the more obvious parts.

You guys are Aces! Thanks again!!!

HH