Ive got a 2006 90 hp carb Honda and have found a 3" hole between the exhaust and the water jacket . Could I weld this closed or should I not take the chance of trying to repair it ? Originally I had no compression on # 3 so I pulledthe dead to find this hole , I also had water in the oil . This engine only has 100 hrs so it obviously sat for a long time , any ideas ?