Steve Tucker's problem

["Chris and Ranae Procyk" <procyk19@domain.elided>]

Did it ever run OK before?

If so, maybe one of your new parts is not so good.  You could be getting a
crossfire. One plug would be getting enough juice to fire at the wrong time-
during the intake stroke.  So the explosion comes back through the intake
valve out the top of the carb.

Happened to me.. I replaced a whole carb for no reason.  But then replacing
a 27-yr old carb didn't bother me all that much.  My reasoning was that it
idled great and since there was an explosion, there was by definition a
spark. so how could it be the ignition?