Anyone have any idea why these darn Kholer engines tap so much? Every one I have ever run, and I have run a lot of machines, do this. Every once and a while the engine will get a real bad tapping noise in it as if the valves are tapping and getting no oil. Doesn't seem to matter RPM's, speed or terrain, flat or hilly, it will tap like the Dickens for a while and then stop. It happened the other day so bad I thought I was throwing a rod completely through the block.