Posted by sherrmann on September 15, 2008 at 13:44:41 from (69.46.201.14):
I need some advice. I just fininshed rebuilding a 651. New pistons, sleeves, bearings and had the head redone (new valves seats, spring guides etc.) by a machine shop. It’s all back together and when I got it running there is a definite noise coming from the air cleaner. At low idle you can’t hear it, but at wide open throttle it’s almost as loud as the muffler. In addition there is no power under load. I ran it up a hill in high gear and the rpm’s just drop off. I set the timing with a timing light, right on the factory specs. I retorqued the head and adjusted the vales again. It has a new governor and when under load I can see it pull the carburetor wide open. The noise almost seems like some exhaust gases are coming through the carburetor. I was thinking that the intake manifold may have an internal crack in it allowing the gases to mix, but there is no external crack that I can see or hear. Has anyone ever seen or had this happen to them. Thanks again, Steve
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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