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Could be pinging, does it sound like you are shaking a tin can with small pieces of gravel in it? A broken head stud can sound more like a small hole in the exhuast. Does it go away after a certain RPM? Mixture might be a little lean. JW has some specs for setting it and timing that folks have raved about, but be darned if I can remember them. A quick search should find reference to the specs.
Jeff
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