Hi. I am new to the sight and am in need of some help please.
I have a 1991 nc30 which ive had for almost a year nearly a year now, and ive never really had any problems with it until now. when i start her up she runs fine when cold, but when heated up a wee bit she starts misfiring up until about 5k under load. As she gets hotter misfiring continues through the whole rev range and has backfired a couple times. If i snap back the throttle when stationary it almost dies and is really hesitant. Ive checked the rear coil pack and plugs but all seems fine.
Does anyone know of any pointers before I take off the fairings and tank to do other checks? thanks

Had a similar problem,asked for help on this site and suggested coils.Changed coils and no more misfire.Hope this is of help.

similar symtoms to a duff plug i had too. if the plugs are knocking on a bit try those first, a tired plug or shorting plug will give the coils some work to do.

Thanks for the replies. I think im goin to go for the coil packs as the plugs look in good nick. Ill let you know how i get on.

You might be right to replace the coil packs but I had a simular problem where the spark was evident and looked strong but in the bike it just wasn't enough due to it shorting. Even though it's expensive it would be worth changing both.