I recently helped MattB do the valves on his W650 and after having a play with it, I'm quite convinced it's a bit of engineering genius. While the bike itself, by modern standards, has pretty questionable brakes, shonky suspension, flexible frame and sluggish engine it's gorgeous to work on. The first thing I noticed that was different about this it's shim-over bucket. So instead of removing cams, setting them blah blah you just grab the rocker arms, pull them aside and remove the shim. Really, really easy to do... Interestingly, the inside of the head cover has some rubber sealant applied liberally to dampen the sound of the valves tapping away... Another cool thing - a small hole recessed in the head with gathers oil, which, according to the manual, is designed for you to slide your feeler gauges into before you measure the clearences. Neat shit. Matt demonstrating his home made chopstick-glued-to-a-magnet device to get the shims out. Bevel driven cams. Methinks that with such low compression and engineering like this the bike would last a very, very long time... It's amazing. I love it and would love to have one in my garage. That being said, I just bought a mag-wheel Bonneville that I'm very happy with. It's only a temporary bike for the next few years. After that I'm quite convinced I'll get a W650 or W800, shonky brakes, slow engine, wobbly suspension and all.