I can relate to that Max, yesterday I pulled the carbies off my Honda because it wasn't running on number 4. Cleaned number 4 carby out, put them back on and still not running on number 4. Pulled the bowl of it and a lot of rubbish in it. pulled the jets cleaned them, put it back together and it fired up. Couldn't understand where the rubbish had come from because I am using my fuel bottle. Anyway today I started it up and not running on number 1. Can't understand it but there must have been something in the fuel bottle, only thing I can think of.