When I got my bike I also found that the previous owner had removed the governor, actuator arm & there were no valves even in the cylinder, I realized why when I went & got the missing parts from him.
One of the retaining bolts for the middle valve was stripped & the other one came loose, something then fell into the exhaust port & clipped the piston, it damaged the bore & they welded it up & had it recoated, the valves would no longer fit due to the welding.
It took me a whole day with a die grinder to get the valves to fit again, but I was not happy, so I ordered a whole new jug, head, valves & basically all of the top end from Service Honda, brand new, now I'm happy, send me a message with what you need, I have a lot of good spares still left & I'll see if I've got what you need.