my cosin has a evinrude 15 serial number 159043. its an older motar not sure what year. we cant get the darn thing to crank. both cylendars have excellent spark they reak of gas after attempts to crank. its not frozen. im not sure where to start. its' got gas air and fire,therore i thought it would crank, but it won't . we even put gas strait into the cylendar, and still nothing. not even a feble spudder. please help.<br />thanks in advance. also we took the nut off the flywheel, what else do we need to do to get it off. we were going to clean the magnets.