Yes Charlie. Partial blockage in fuel pipe and dirty carb. Now running better than ever. I’m sure the new spark plug courtesy of your good self is also making much stronger firing. You can feel the blast from the exhaust several yards in front of the machine now. It surprised a few passers by yesterday but unfortunately none of them were wearing silly hats it could blow off. Now that I’m retired little jobs like this will hopefully take a lot less than a year to get round to!