The carb is stamped Nikki 697298 78N
I couldn't salvage one of the gaskets, specifically between the carb and the insulator so last night I made one from a 0.4mm oil paper gasket roll. Upon disassembly today, I think that gasket paper may have been leaking. 3/4 of the gasket surface is quite obviously marked in the contact area. The remaining area had no marking at all. I might see what I can make from a cereal box etc that is thicker. My local orders once a week arriving on Monday.
I'm hoping it's the gasket seeing the carb is now clean.
