Happy Bank Holiday!!
I thought I would do a bit of housekeeping on the old girl and replaced the plugs but there seems a large amount of residue on them - I imagine it is running a bit rich?
I am not sure when they were last changed, probably 4 years ago but less than 2000 miles.
I'm running a standard carb but that's actually pretty good as I stripped it over the winter and rebuilt. I could upgrade to a Weber but trying to save some money at the moment so a bit loathe too.
It's an auto choke which I wonder if that could be the issue? At start it pops out a fair bit of soot from the exhaust, but if you turn it off and back on then it's completely fine.
Any help appreciated.