Kan. Stat. Ann. § 12-145
No city shall levy a vehicle tax on: (a) Motor vehicles which are exempt from the requirements of state motor vehicle registration under the provisions of K.S.A. 8-128 or 8-136;
L. 1967, ch. 57, § 3; L. 1978, ch. 30, § 5; Jan. 1, 1979.