They are for the Fresh Air Emission System. Fresh Air Is drawn into the Exhaust port, to help reduce emissions. Like the old Air Pumps used on cars from the same period. They do no harm to your motor. You can delete it if you don't have Emission testing in your area. There are block off plates sold, APE has them
kzzone.com/billet.html
Your service manual will show the related parts, the Air Switching Valve, and vacuum lines.
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...
