The carby was replaced less than 6 months ago with a genuine Walbro from a NOS supplier in Germany so diaphragm and wear on metering needle shouldn't be a problem as it hadn't done many hours before I misfueled it. I also got a NOS rebuild kit with the piston, rings, gudgeon and little end bearing for less than Stihl Australia wanted for one ring. Haven't had a chance yet to go through the fuel system but will do and will let you know what I find. Thanks for the support.
