1960 mercury is acting like its out of time

Joined
Sep 5, 2007
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1,790
I brought the engine back to life several months ago and it ran fine in the test tank. Now it makes a "pop" throught the exhaust as I turn the engine over, My guess is the magneto has moisture in it . I checked the timming marks and they are the same so I know it hasnt jumped any teeth on the belt. Any old school guys have an opinion ? thanks
 
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