Upon removing the air filter for cleaning I noted that some slight debris (a few particles of dirt ) had entered the air boot, just before the carb opening. I will be removing the carb soon and inspect the manifold to see if any similar debris reached the cylinder. I am quite anal about greasing the edge of the filter and inspecting the fastners on both ends of the carb to prevent such delemmas. Should I try to inspect any further, or am I over reacting?