I was looking at a Johnson 225 and the guy said that he had ran over some sand and the motor sucked it in and 5 minutes later it started knocking. Does anyone know how sand would cause a two stroke to knock. I already have one of these motors new and I know that johnson recalled it and put a brand new power head on it because of the head bolts coming loose. Could this be the problem causing the knock. Is it worth buying to rebuild or not?
