'81 KZ 750 - HEADLIGHT replacement to save the bike from dying

If you have a h4 halogen already, a h4 led plus right in, no mods needed, did on 650, you can switch lighting with a z1 repo rh control about $40, quite easy to do, the blue lighting fee is butt spliced after the 6 pin connector to blue/w and brown/w, in the harness going to existing control, need to change 4 pin on z1 control exist 6 pin, z1 has a double flag female return from switch, put male on bl/w and br/w, and plug in for return to fuses, ignition colors change between z1 control and main harness, use schematics available here, and relocate as needed, good luck

Pardon, the brown is butted to the Bl/w and br/w, after looking at pics, sorry

Is that an original F6 tire in your photo?

No, junker that came with 750 wheel, not dunlop forgot brand, since replaced.