I've had my boat for 2/3 years now and my motor would always start up on the second crank....for the past month or so the motor has been very hard to start...often taking 10/20 cranks before firing up..once it gets started I have no issues with it the rest of the day and if i run it back to back days it doesn't give me any problems but if it sits all week I have the same issues? Any clue on what might be going on or what to check for?