No, it's totally random. It does it cold or hot. Oil is fine. Let it sit today after changing the plugs for about an hour or so. Cranked it up and the knock was there. Don't know how old you are but if you can remember the days before unleaded gas, it KIND of sounds like an engine made for leaded buffer that someone put unleaded gas in. Maybe a little harder. It's definitely just one piston if it's a piston knocking. But for the life of me I have never heard of a RANDOM piston knocking. It is definitely engine related and it's something in the top end for sure.
Monday, November 16th, 2015 AT 12:24 AM