Hi Nikroc. Yes thats right, the bike was cold, ticked over for about 30 seconds then died. On pulling the plug the spark was weak, i tried a new plug that i carry and it was also weak and thats when i got the offer of a used plug from another member of the group. It was in Morocco and i had been riding for a couple of weeks with no problems. Today I have been working on the bike and fitted a new iridium plug from a Yamaha dealer. the spark looks fine. i fitted it and the bike started right away and ticked over fine. The used plug when I pulled it had a nice colour and still has a good spark. After fitting the plug I took the coil off and tested it with a multimeter and the primary resistance is 4.4 ohms the secondary was 18.1k which was taken with the cap in place. I have fitted it back on and bike seems to be running fine.