GrahamNZ
High Miler
A few of us are complaining about pinging (pinking). While poor fuel or a real bike problerm may well be the cause, not everyone can accurately identify pinging. I'd describe pinging as a slightly irregular tinkling sound, usually heard when an engine is hot, working hard, and unhappy about it. If the sound is regular, more of a tapping or knocking, heard under load and even when an engine is cool, it may be piston-slap. If the knock lessons when the engine is hot it's almost certainly piston-slap. Knocking, even light knocking, heard while an engine is running lightly is often tappet noise or a loose bearing.
Graham
Graham