I'm the guy who's had 2 failures, one at about 25k in August 2010, 9 bent inlet valves
second hand head put on, then this one failed at the beginning of May this year. The head was quite high mileage so it was probably due to go. Typically, I'd just seen manual tensioners and was thinking about getting one, then pop. Fuck.
Bikes in the shed with the cam cover off, more bent valves. Cant be arsed doing it all again, so when finances permit at the end of the month, I'll be getting another engine, AND A BLOODY MANUAL CAMCHAIN TENSIONER!!