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Thank You for the comments. The chainsaw was running normally and then suddenly there was blue smoke at the exhaust followed by cutting out. So not a gradual deterioration. My concern initially was that running slightly oil rich was the possibility of oil build up in the carb possibly...

The chainsaw has been excellent and reliable. Suddenly got very blue smoke and would not restart. Have always run it probably slightly too rich with oil (40-1) I assumed it was a carburettor problem so replaced it with a new one. I removed the exhaust box which had oil inside. Still...