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That sounds just like my problem - I must admit I didn't really hang around before setting off. The previous times I had give the bike a good 5 min warm up before setting off.

It does have Keihin carbs on it, not sure if that would make a difference. How could I tell if it's got a carb heater kit on it? Looking through the paperwork it looks as if the carb heater kit was fitted under warranty at some stage but with a change of carb would this be irrelevant now?

Thanks all for your replies so far.