intermitent exup fault,any ideas?

[baldy]

I've fixed the bugger! there was a lip on the casting and groves worn on exup valve where the two had rubbing next to each other during operation.i filed the casting smooth with a smooth file and emery clothed the end of the exup valve where it meets the casting,applied copperslip and have riden it for 100 miles or so with no reaccurance of the 7k fault.the valve was sticking open due to the wear on the casting.Hope this helps someone at some point!