I have a 1989 mastercraft prostar 190.  When it runs it runs perfectly.  However, often, it won't start.  It sounds like its flooded and wants to start but just won't catch when it turns over. It used to happen only after it had been sitting in the sun but now does it all the time.   My mechanic just rebulit the carb thinking that was the problem.  It was not.  I am trying to figure out what it could be.  Perhaps the ignition (still on points)?  I'm getting ready to sell the boat next spring but need to get it running right again first.  Any help would be great.  Thanks.