(posted this on the .net site, sorry if you've seen it)
One day, I would like to rip apart my 400's engine and fit brand new absolutely everything, so I can be sure (!) of reliability. The two main gremlins are the crap camchain adjuster (new chain, adjusters etc fitted october) and rattly primary drive. It sounds like there is a little man playing maracas under the fuel tank, and apparently this is normal! All I need is steel drums in the carbs and dancing girls on the clocks. I've heard vague mentions of a better tensioner and belt drive available. Where can I get these, and does anyone have any experience of these? Preferably from sources in England, since shipping things from America or Japan would be rather expensive.