dont think you need to be a Honda expert to reconize a bad knock Diesel......if it sounds terminal it probably is.
the only thing i would look for is silver in the oil, that would indicate it;s RS, if it;s ok, then take the sump off and have a look.
just remember..........a stuffed Honda is just as stuffed as a stuffed Briggs. wink wink


I always come back to an Echo