hi
thanks for the advice , have replaced plugs , checked coil and leads/caps for resistance readings and seem fine .
pump operating as it should , went out last night and it ran superbly well for about 15 mins !! and after blasting down a long straight in top gear closed throttle and was back to cough splutter pop.
then started the bike this morning and it ran one 1 cylinder all the way to work?
plugs are dry and sooty and so are my hands
any other ideas would be greatly appreciated and thanks to the helpers so far
martin