Hi y'all. Firstly thanks for the advice but I still have the problem after servicing the throttle cable and twist grip. I have a bit more info so maybe it will help the diagnosis. It's seems to be an intermittent fault. Sometimes it's fine ticking sweetly at 1500 rpm then it will jump slightly to 2000. When it is idling at 2000 in 1st with the clutch in if I pop in neutral it drops back to 1500. Pop it back in 1st and it goes back to 2000. Hmmm. I'm not sure where I'm looking to find the sensers you mentioned could you explain further please?

Thanks again

Jay