I recently got hold of a motor where they had not only welded on the gear lever and countershaft sproket nut, but when I got the clutch cover off (no welded on kick starter though), they had also put a small tack on the primary drive nut to stop it from coming loose. My guess is they couldn't work out what the wave-washer did.
These guys fitting skills are non existant so we shouldn't blame them for their ignorance, a hammer, shifting spanner and a welder are their usual tools of trade. Look on the bright side, the bikes these guys operate on are often ones that stop running from other means too complicated for them to figure so they either go into the shed for a few years hibernation or place them on ebay saying 'doesn't run' where they end up go for a song to someone who knows better. A simple once over is often all that's needed to get them going again.
