i would start at 5. my Super Tiger 45 ran good at 7 but start at 5 and when you get it running pinch the line and if the RPM increases after a little bit you are rich and screw it in at 1/8 turn intervals till you get it to just drop in RPM then turn out 1/8.

if the rpm drops without increasing, it is lean then screw it out 1/8 turn till it increases then you have it pretty close. usually i really get picky with mine low speed valve because i run tuned pipes. but when you get it pretty close by pinching the fuel line to check it then let it idle for about 15-20 seconds then increase throttle. if it chokes and dies lean it just a little bit. do this until you get a smooth transition from idle to full power. doing this will simulate a landing approach. if you have it too rich and are too fast or too slow and you give it power then your engine dies and you are SOL. if you are too fast you can still easily put it on the ground but be careful cause you will hit the ground harder than nomal. if you are too slow then just try to land it like you normally would no matter where you are because that is about all you can do. remember the slow you land the less likely you are to mess your plane up. better to be a little to fast than too slow.