Hi Martin, Yes that is helpful thanks. I’ve got a spare plug that I carry with me. However, access for changing it on a wet windy Welsh hillside isn’t great because the side fuel tanks block access from what I can see so far (I’ve only had the bike a month or so). I’ll have a look at the plug when I change to the new air filter I ordered yesterday. My other theory was that the air filter may be dirty or clogged as the bike does smell like it’s running quite rich. However, it doesn’t feel down on power when riding. If I can sort this issue out it’ll be a cracking little bike.