Hi all. My Honda 400 Superfour NC32 has all of a sudden started running badly, will only run on 4 cylinders with choke on 3/4.
Been sat in garage about 4 months without running, was fine before I parked it up. Since I parked it ive changed plugs & swapped fuel tank.
Any ideas please ?

Very late reply here! My first port of call would be the carbs. I had a similar problem on my NC35 and it turned out to be mucky carbs. If you still haven't fixed it I would consider a carb strip and clean.