Yours is the LTD, well the other guy has a different model. But it looks like your cable as well as his cable is available, at least NOS on Ebay.
cgi.ebay.com/ebaymotors/KAWASAKI-KZ750-1...&hash=item45ee461c5a
Don't know why he is having so much cable trouble.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
