Thanks guy for the comments, I'd say it the inlet rubber at this stage. The throttle mechanism does seem OK in fact if you reach in through the air box you can feel the slide going up and down with the tip of the finger (I must have small hands) as well as hearing the movement.
The only problem now is that I don't think I'll be able to get my hands on a new rubber between now and Sunday and I was really looking forward to having a blast especially as it has been a while, plus the weather is excellent for a change...
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