Hi all,
Problem solved, finally - installing a different carburettor fixed it.
I bought a used genuine carb from eBay. After cleaning it up and installing it, the engine is now running as it should. Both spark plugs look the same, and I think they look about right.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/ubbthreads.php/ubb/download/Number/12062/filename/IMG_4116.JPG)
I don't know what was wrong with the old carb, I went through it several times already, but I'm not going to waste any more time on it. Fuel consumption is a fair bit lower with the new carb as well, and I think it starts a bit more easily.
RLP