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Indianapolis area.
Motor mounts are new and tight and fan blade definitely not the issue. Don't think it's ping because don't hear sound pulling up hill under load like as I have experienced with other motors. Had a retired mechanic very familiar with 544's drive and listen and he was stumped. I have suspected the timing gear but have not read a description of timing gear noises. I don't know if a worn gear could move ever so slightly under high speed load to cause the gear to touch something internally and make such a noise.
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