I have a feeling some oil has gotten on the starter clutch and is causing it to slip and not start. So probably some bad oil seals? The stinking clutch is impossible to take apart on a jawa 210...unless I'm just a complete nincompoop. Seems like you really need an air wrench to get the clutch bell off. (which I don't have of course) The bike was running fantastic right up untill Disaster Ride 2008.