The left exhaust downpipe was stone cold and the right was hot, which obviously indicates that the left cylinder isn't firing, and yet when I disconnect the left hand plug-lead, the bike stalls immediately!
There's a spark going to the left plug, and if you examine it, it's wet as if it's not firing, and the downpipe is stone cold, so why the hell does it stop running when I remove the plug-lead???
This thing is doing my head in! LOL