intermittent running on one cylinder

[aermacchi]

My sv has developed another fault, when cold it runs on one cylinder as it warms up it starts backfiring and evenyually runs on both cylinders. After a few minutes it starts doing it again. I've checked the chokes and they appear to be ok, there is no obvious sign of air leaks in the carbs. It does seem to be running rich or not burning the petrol properly Any ideas?

[plowsie]

Wet spark plug? Bin out in a lot of wet recently?

[Tim in Belgium]

It could be a loose connection on one of the coils, an annoying problem I once suffered from, especially as vibrations at revs would cause it to cut out one cylinder. Worth checking along with the carb/fuel/drowned spark ideas so far.