hi all

changed plugs ,air filter and oil carbs have been cleaned and ballanced and float hieghts set.
bike is flat and stutters at 11k revs in every gear.
could it be a coil or ht lead breaking down cant understand why its worse at 11k.
any help would be much appreciated

Is the airbox, snorkel and rubber flap on the frame all in tact? if they are modified / missing it will cause running issue high up.

Also fuel vacum tube ok? It could be starving of fuel if the tube sucks itself closed.

yea all in tact and also renewed vacuum hose, ive checked the plugs and the front right dosnt appear to be working as hard as the others its a different colour more of a grey colour, im thinking ht or coil now

If you can, i would suggest getting it on a dyno, see what the fueling is like. You would have a good idea if it's missing (providing they can get to the front and rear leads). Or if you have a fuel/air issue. COuld save you lots of time and money