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thanks for answers, i cheeked the plugs and they looked ok,the airbox had a bit off dirt and oil in it so i cleaned it bike running a little bit better but when i tested it the engine would struggle a bit when idleing the revs rise and drop a little bit and when rideing it gos ok but then stuggles a bit but if i give it any throttle it is ok, i took it down the duel carrageway and at higher speeds the engine starts to cut out and the back in also the exhast pops a bit but it is a race can and have been told it is normal and when i pull the cluch in the revs drop and engine stalls also i if i rev it hard in neutral a small bit of white smoke comes out exhaust. engine sounds a bit knockey but a friend told me that that is normal????? hellpp i have ran out of ideas how to fix this i will book it in but my local bike shop is booked up for three weeks and i need bike for work ? have fitted air new air filter. if i leave it to tick over it is fine and will tick over alright apart from revs up and down a bit it only revs up and down a very little bit