Hi Terry & Yukonflyr,
The carb & the exhaust nipple are both clear. I had a brainwave and Phoned the importers who after wrapping my knuckles for using the wrong fuel (Apparently this is most important when you have a piston ring) offered me their free repair service as long as I had not tampered with the engine. You pay for the post and packaging and for any new parts fitted. I think even then they are at a discount!
It seem a more than fair service and they gave me the impression that they repair the engine the day they receive it what more could you ask. So if you live in the UK try Tigre Engines. 01923 270129

Again thanks for all the advise (Which is never wasted)
Richard.