Not a 600 but a 250 but just hoping to get some idea`s. A mate of mine has an old XR 250 which after putting away in the shed for 8 weeks will now not start. The problem seems to be that he can`t get a spark any further than the end of the bare HT lead when grounded to the engine. We have tried different plugs and caps but cannot get a spark at the plug. Any idea`s gentlemen ? Cheers Bob.