Cheers guys, from all that i get the message. Leave it alone and service/replace the standard carb. Will get some standard dampers, that's it. The heater/blower is just to demist the screen better, and somewhere to to warm my finger tips.
One more question, when driving it from from England to Ireland, about 400 miles, I lost a load of engine oil. There is a long range fuel tank on it, so I never stopped apart from the ferry crossing. (No snorkel). But have never lost any since doing normal driving. Any thing to worry about.