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The two mating surfaces between the head and the cylinder had no signs of leaking under compression so I am doubtful that it was drawing on intake stroke, surely if it was it would have to have been leaking compression also and that would have been evident on the surfaces. Another reason a cracked head could be likely. When the long nozzle on the carb spray was inbetween the head and cylinder and pressed within 2 seconds the engine rpm would raise by at least 600rpm for a good 30 seconds until it used up the spray.
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