1976 55hp chrysler
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Posted by Brian Davidson (126.96.36.199) on September 19, 2005 at 23:51:05:
Recently after going full throttle for a long time, the motor has developed a "thump", about every 7-9 seconds. It idles fine without the thump and goes into neutral warmup at high RPM without the thump. Only when its out on the water soes it "thump". Besides the "thump" it runs good. Already replaced plugs, head gasket, and the prop is not slipping.
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