Originally Posted by def
Engine knocking to the untrained ear is deceptive and often misleading. It is rare that the boxer engine blow up after the owner reports an engine noise. You'll need to provide more details regarding the so-called knock so we can accurately diagnosis your issue. So, here are the hints; 1- Frequency of the knock. 2- From what area of the engine does the knock come from? 3- Does it go away with RPM changes? 4- Clutch in or out? 5- Hot or cold? 6- What engine oil is in the engine ans how many miles on this oil? What brand filter? Finally, try this. When you next cold start the engine, let it run for 10 seconds cold and shut it off with the kill switch leaving the key on. Count the seconds from the time you shut it off and when the oil light comes on and report back here.
As a matter of curiosity I did the cold shut down test you outlined above and got ~12sec. on my bike. I would assume the longer the time, the better the health of the engine. Is there a number which indicates "bad"?