Sorry to be hogging this thread, I should 've started a new thread before running away with this one.

a.)Yes, I have some thick 1/2 inch foam rubber-banded around the tank, open at the top.

b.)Nope, one needle valve on the port side of the carb, and a long upright screw in a spring on the starboard side.
Haven't fooled with that one yet...I let my instructor adjust that the last time I was at the field.
I'll be talking to him again - hopefully tomorrow afternooon.

Downunder, Thanks for pointing out the "relative" position of the settings...which I take is variable, based on the known benchmark, which is the breakpoint from 4 stroke to 2 stroke.

If what you said is true...... <<"The number of turns the needle is opened is going to vary depending on what type of fuel you use -mainly- and most engines need about 2 turns or more to be certain they won't run lean, especially on the critical first start of a new engine">>....then maybe I'm still in a slightly lean setting (instead of overly rich setting) afterall, which gives me a piece of mind according to the current philosophy of breaking in an ABC engine hotter.


I'm turning this "problem" over to my instructor
- he flys YS four strokes these days but he no doubt had to go through the 2 stroke portal to get where he is today.
He's got a good ear too.