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Message: <blockquote data-quote="aaa123" data-source="post: 26633" data-attributes="member: 2816"><p>If you haven't yet dealt with this, first drain the engine oil into a clean pan, anything as long as it's clean. Look at the oil under various lighting and see if you can see a metallic brassy sheen. If you do, don't run it anymore and arrange for a rebuild. If you run it enough, all of the bearing will finally make a visit to the oil pan and you'll start working on the rods and/or crankshaft and it gets expensive real fast. If that is inconclusive, get an automotive stethescope. It's like the one doctors use, but has a tip that lets you probe around and touch different areas to isolate a sound. Sears has a decent inexpensive one. Spend a while poking around and listening. If you can unhook the throttle linkage and blip the throttle from the engine bay, you can see how it reacts.</p></blockquote><p></p>