Hello
Well, the sound is not like you would try to change a gear in a car without the clutch pushed, it is more like gear teath hits another teath. My quess is that the starting clutch is worn out, and the friction between it and the gear is to small(28120->28110, check the image).
Thats the problem, my local kymco dealer is saying that they dont have parts for this model, because Kymco People 250 have never been offered in my country(I am from Poland by the way). So right now I am looking for other possibilities, as far I know, those engines have been built with close cooperation with Honda, so maybe I`ll find this part from some Honda model.
Anybody know, where those engines were mounted, besides kymco people ?