I had similar problem recently sometimes it would tickover 1500 other times 3000 or so. Traced it to the throttle sticking now and again. I had to take the tank up, then remove the air filter and lubricate all the moving parts of the trottle under there. I was suprised how many moving parts there were to get sticky. Put some oil down the cable while I was at it. I am told it is a quite common problem on them especially if they have been sitting for a while. I found it made a huge difference to the response.
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