Need a pic of the other side of your carb, does it say mikuni on the top side of it?, if so then you have the same type of carb as the rest of us from GIO, and these would be the jets you would need
Main jet - 110 in a type N100.604 Large Round
http://www.sudco.com/mikuni_mj2.html#n100604
Pilot Jet - 25 in a type VM28/486
http://www.sudco.com/mikuni_pj.html#vm28486
Those links will provide you with actual Mikuni part numbers, your local motorcycle dealer might also be able to get them from other sources too.