[bluesman]

My 1650 makes a loud clattering noise that you would swear was a rod about to come flying out through the hood. But the engine runs perfectly at wot, will pull my brinley plow and just recently pushed 10 yds of topsoil all over my yard. Doesn't run hot, doesn't use oil, etc. I've looked everywhere I can see for some sign of interference but can't see anything hitting. The clatter follows rpm so it's either in the engine or it's the engine shaking enough to hit something. Any ideas? Has anyone else had this problem? Tia
Dave