Hello and thanks in advance to all who input. I have a 52 inch wright stander with a 23 hp kaw. Over the last couple weeks I notice a sound getting worse now its loud. Here goes i will do my best to describe. When I am running the engine at an idle you dont hear anything wrong. Once you full throttle the engine you start to hear a clanking noise, that will continue until you put the engine back on a low idle. And as the engine windes down in rpms. It will take the noise about 3 to 4 seconds to calm down after you already lowered the rpms to lowest idle. Thanks again.