Kev7781

Hi does anyone know the factory settings for a force 18 engine. My 14 year old son was given a second hand one. I’ve had it running but it just revs to hard. The idle is at recommended setting 1mm. The high end is set to about 2 1/2 turns out from in but by blowing down the fuel feed it’s probably more 4 turns out. Now the lower end is about 3 turns out from been flush. Any help would be appreciated. many thanks kev