Hi guys, my father wants to give me his REX RS 450 and has been on the road with her until recently. I have to say that I have not seen the REX yet and I would like to make myself smart in advance. The problem that he described to me is this: He leaves the REX after driving – but the next day he has to order properly so that the REX starts at all. If she then runs, she runs completely calmly, has normal stationary gas and also the passage while driving is inconspicuous – runs quite normal and does not go out either. Only when there is again a bit of a crazy engine (so should be from about 1h and more my father told me), there is again this occasion problem. Now I have had a lawnmower engine (4-stroker) completely disassembled and assembled into his individual parts and it still runs today without problems, but know me with “moped engines” actually not at all. I would guess that the V I would check the candle for sparks after this service life – maybe what gets wet after an hour and disturbs the sparks. I would also look at the candle exactly if it is brown and the distance for the spark is not too small or too large. I would also do ignition cable check. Air filter, fuel filter, carburetor I would not suspect, because it starts at some point and then runs quite normal. Ha Do you know what else it might be? Could it be this “joke” I’ve read here several times? I guess it’s used to make the fuel mixture fatter in the cold state, isn’t it? I thank you for your help.