Re: a friend's ZX14 engine gone while riding ...
I have had several motorcycles. at 10,000 miles my 14 engine blew. Because I was over on the oil change I was thinking I would surely find a damaged crank or dropped valve. Come to find out one of the rods snapped in half. Crank is fine.
Although I admit I rode this bike like it was stolen. It had probably 10 quarter mile track passes on it, I had it near top speed probably 10 other times on the highway and it was almost 2000 miles over on the oil change.