I have the same issue with my Peugeot Sum-Up 125 which I bought in Oct 2008
Was fine for the first year (which is all my warranty covered), but this winter it simply simply stopped working in cold/damp weather.
It is stored in a Garage when not in use and only works in cold weather if I have left it in there for a few days. It will then work for a week and then cut-out again until I leave it in the Garage for 3 - 4 more days.
I have done the following:-
* Had the Throttle Cable replaced (was recalled for this)
* Bought and changed the Spark Plug
* Recharged the battery.
* Changed the air filter (in case this was expiring and getting damp was preventing air getting to the engine)
* Adjusted the idle speed up/down (no difference)
In the posts below it mentions "Carb Freezing Up" which I cant fix under Warranty. Has anyone any more details on this?
Gareth
February 2010