Quote:
Originally Posted by V4F
good ideas ……….….. forgot compression was weird … #1/4 65# #2/3 50#
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I'm guessing the head gasket is beginning to fail. When cyl 2 is on its power stroke cyl 3 is on its intake stroke and vice versa when cyl 2 is on intake cyl 3 is on power. If the hot gasses from either cylinder are crossing to the adjacent cyl the incoming air/fuel charge could be ignited. Resulting in a backfire through the carb.
Good luck,
Tom