Keep the info coming. This is just what we need to stay on top of our engines and their maladies. That being said, I understand that the 100 is no longer available and is replaced by the 106. Does anyone have anything to say about the newer designed engines? The obvious differences are the cylinders have an opposite stagger (RH Forward) and the carb blocks are of a different material. Have any of these changes made a difference in the running characteristics of the 106 class engines_bob