Sudden misfire and its not due to rain

[CRH]

you have got two coils on your bike,each coil running two cylinders,if the coil was faulty the bike would run on two cylinders,as crh has already said check the plugs one at a time by resting on the head and turning over engine and also the ends of ht leads tend to harden with age,a trim solves this as already said,another one to check is plug caps if they have not been changed for a while it might be worth replacing with new,not expensive....let us know how you get on 
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......AS ABOVE!!!!!!!!!!!!!!!