My 26 has always had this very annoying problem. When trying to set the idle speed with the trim, it runs either to slow or to fast. It just seems WAY to sensitive around the idle point. There is just no servo resolution, linkage that would be good enough to set it at the right idle speed and maintain the setting. For example when it is idling to low you can apply just the slightest pressure on the throttle arm and it starts idling to fast. I have a extension arm on the throttle arm for better symetry. I know if this extension arm were longer it would give better resolution, but don't really think even that would solve the problem. This has me baffled. Makes trying to get idle low enough to land very risky! All help appreciated.