Since you have already taken the idle screw and the needle out, you need to start from the basics. Refer to the OS site for the manual on both engines.

Usually on my other engines, for the low speed screw, you turn it in all the way with the carb fully closed and then turn it out by 1.5 turns. BUT MAKE SURE that this is what the manual asks you to do for your engines before you do this.

For the high speed needle, again check with the manual. Since you have cleaned out the engine, I think you should start a little on the rich side to what the manual says and two turns sounds like what the manual says. Use an electric starter if the engine is suitable for that (I think it is) it it doesnt start by hand. Run it a little rich initially at idle (about a minute or so) so that everything gets sufficient lubrication and then lean it by sound. Once you determine the peak rpm, open the neede half a turn to richen the mixture so that the engine does not quit when you take off (engines gain rpm when in the air). I am assuming the engines have been run in. If not follow the running-in procedure in the manual after initial rich start.

Hope I have not written anything wrong. Others, please correct me if so

Ameyam