No offence, english sounds a little rough so I will keep it simple.

If it has been 4 yrs, I would take the plug out, and pour a little fuel in it and also down the carurettor, and shake it a little so that all the fuel lossens up any gunk inside, and then pour as much of it out as you can. this frees the engine up some and helps clean it out and gets oil down in the berrings and crevises.

Im not sure about the prop to use on it but get a prop and prime it up, and flip it over, an engine like thant shouldnt be too hard to get going.

sorry no one answered the post ,,, there seems to be smoe issue with folks that they feel that some answers are too easy and they deciede they wont help.... hope i helped