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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