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Cheers everyone for the help. Mudnut I found a few split vacuum hoses under the air cleaner box, replacing these has helped the problem a lot. Also mate your RB30 "Helpful Hints" page has been absolutely useful, I actually discovered it months and months ago, and refer to it all the time!
TroutNut I checked the choke valve, it sometimes gets "stuck" open, so on a cold morning just need to blip the throttle before starting to reset the valve to the closed position. Sticky linkages ? !
Dom14 its only on Petrol, and I'm going to look over the vacuum lines for brakes soon too.