Yuneec has not published a torque specification sheet, or any other maintenance regimen that I'm aware of.
The specs for an m3 cap head screw is 2.48n.m., or 21in.lb. For m2.5 the value is 1.43n.m., or 12 in.lb. Personally, I don't use max torque values with Chinese made fasteners, ever. Too much work digging the shafts out later. Use medium blue Loctite.
https://www.holo-krome.com/uploads/7/2/7/5/72754089/hk_torquedatachart.pdf