Hi guys, Got a problem. Rebuilt k301 12 hp in a 129 CC that starts to rattle and knock after it gets warm while under load plowing snow. Governor will load up carb then engine will die. After 15 seconds, start it and it throttle's up and will run fine w/no rattling or knocking. It sounds to me like it goes into an advanced ignition state but the timing is set correctly. Will do this some days and not others.
Throttle up real fast to clear any carbon buildup seems to help but not always.
. Anybody out there ever have this happen to them and do you know of a remedy. Could the hydro pump be dragging it down or is it in the ignition? If anybody knows what's going on let me know. Driving me crazy! Bob O. out