my " new to me" boat started having a overheating problem. Mostly ideling around for about 3-5 minutes, if i throttled up a bit the temp came back down. I suspectedthe impeller, so i took it apart and found one fin completly gone and most others half ripped and badly cupped in the middle. My question is, is this my whole problem? do i need a whole repair kit or just a new impeller? I'm guessing i should go for the whole kit with new oring and the stainless bucket that the impeller rides in. Thanks Erik