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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