1975 Evinrude backfires
 

Two years ago I put on a new head gasket on my 70hp Evinrude also a
complete casket set for the exaust had a leak into the cyls run good
after that. Yesterday went out run good for about 2 miles shut if off
ten min. later it wouldn't start only backfiring when you turn it over.
Changed plugs get gas to plugs compression good on all3 cyl. Any ideas
why it doesn't start? Thanks in advance



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