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check first if all cylinders spark plugs are firing, seem like you are missing on one cylinder. this will cause as well backfiring.
if this is not the case then:
backfiring can be caused by too rich fuel mix or by wrongly set advance. there is unburnt fuel present in exorst and this cause backfire. these two are most "popular" causes of the backfiring.
hope this will help you solve the problem, do not forget to vote...
Back fire can be caused by different faults.First is to much fuel
because of worn carburetter, or wrong adjusments on carburetter. choke
sticking will cause backfire. timing be out of adjustment will cause
backfire exhaust leak can cause backfire. bad spark plugs, or plug leads
, distributer cap worn of cracked will cause backfire as for fuel in
muffler, if it combusted in muffler , the muffler would split open it is
not that.
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