Welcome aboard!
As you suspected, your bike is running very lean; the jet kit is a good idea.
Also: ROWSDOWER!! :laugh:
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1980 KZ440B
1981 Yamaha XT250H
1981 KZ440 LTD project bike
1981 GPz550
2013 Yamaha FZ6R