I AM RESTORING A 1978 EVINRUDE 115 ... THE MOTOR WAS RUNNIG FINE ON THE HOSE PIPE THEN WHEN I TOOK IT TO THE LAKE THE BOAT WOULD NOT IDLE WITHOUT THE WARM START LEVER UP. SOMEONE TOLD ME THAT IT WAS JUST SOME GASKETS ON THE CARB? IF SO IS THIS SOMETHING I CAN DO. THIS IS MY FIRST MARINE MOTOR TO RESTORE THANKS FOR ANY HELP ON THIS