Well I have a 2003 650 too, and so far the kickstartshaft has broken just like it is mentioned in the owners doc, and the e-start is not much help if u want to start it. Since I've replaced the shaft I have done about 500 km, off-road only, in pretty harsh conditions, and it's still going strong(fingers crossed). I guess the main thing is to change the oil regularly. Sooner or later they all break down.