New here so hello to everyone. I have read and learned a lot from here in the past but can't find the answer I need now anywhere. My evinrude 25 (25702H) comes up as a 1977 model. I need a water pump impeller but the shaft and the impeller does not match what is supposed to be in that model. I'm thinking someone replaced the lower unit with one of a different HP because the shaft looks like none I have ever seen. I have also talked to several mechanics who have never heard of one like it. The shaft is round like any other except where the impeller rides. There is no keyway or pin of any sort. Instead there is a hex pattern in the shaft that the impeller slides over to lock it to the shaft. The impeller has no metal insert, it is just rubber. Same size as shaft and it's kinda of an interference fit over the hex pattern on the shaft. Sounds crazy but it works. It doesn't move as much water as it used to so I wanna replace it but don't even know where to look for the part. Can anyone tell me what this is or have any ideas where I might find any answers?
