@
Zolland obvious your need to set idle high is to compensate for an internal issue, possible idle circuit or wacky sych? Now 15 year old carbs should be renewed anyways. All consumables (orings, rail seals and float valves) automatically replaced, intense clean, followed by careful setup and wet testing, thus assuring carbs will go back on ONCE, with no frustrating, repetitive, time wasting "do overs".
USPS Priority Flat Rate service great bang for the buck, quick, reasonable $ using their medium flat rate box, I think around $14.
I'll PM you with further info, your option to go forward at that point. Here's an example of recent work (from the outside). Note these came to me seriously neglected over a period of years...owner reported total success in running !