My Chotia 460 has a 38mm. Mikuni carb. mounted with a Mikuni P/N VM34-200
mounting flange.  Main jet - 220, Pilot Jet - 30, Needle jet - (154)Q-5, Jet
needle - 6DH3, Slide - 2.5, Needle & seat - 1.5 (VM28/163) Air filter - K&N
RU-80
Mike Schweim