If it has brakes it has to be inspected.. If registered 4500 lbs capacity or more as well

Not necessarily with brakes. I have a ZX250 registered at 4400 lbs. No inspection needed

SUBCHAPTER B. VEHICLES AND EQUIPMENT SUBJECT TO INSPECTION AND REINSPECTION

Sec. 548.051. VEHICLES AND EQUIPMENT SUBJECT TO INSPECTION. (a) A motor vehicle, trailer, semitrailer, pole trailer, or mobile home, registered in this state, must have the following items inspected at an inspection station or by an inspector:
(1) tires;
(2) wheel assembly;
(3) safety guards or flaps, if required by Section 547.606;
(4) brake system, including power brake unit;
(5) steering system, including power steering;
(6) lighting equipment;
(7) horns and warning devices;
(8) mirrors;
(9) windshield wipers;
(10) sunscreening devices, unless the vehicle is exempt from sunscreen device restrictions under Section 547.613;
(11) front seat belts in vehicles on which seat belt anchorages were part of the manufacturer's original equipment;
(12) exhaust system;
(13) exhaust emission system;
(14) fuel tank cap, using pressurized testing equipment approved by department rule; and
(15) emissions control equipment as designated by department rule.
(b) A moped is subject to inspection in the same manner as a motorcycle, except that the only items of equipment required to be inspected are the brakes, headlamps, rear lamps, and reflectors, which must comply with the standards prescribed by Sections 547.408 and 547.801.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995. Amended by Acts 1999, 76th Leg., ch. 1189, Sec. 29, eff. Sept. 1, 1999.
Amended by:
Acts 2015, 84th Leg., R.S., Ch. 1255 (H.B. 1905), Sec. 34, eff. September 1, 2015.


Sec. 548.052. VEHICLES NOT SUBJECT TO INSPECTION. This chapter does not apply to:
(1) a trailer, semitrailer, pole trailer, or mobile home moving under or bearing a current factory-delivery license plate or current in-transit license plate;
(2) a vehicle moving under or bearing a paper dealer in-transit tag, machinery license, disaster license, parade license, prorate tab, one-trip permit, vehicle temporary transit permit, antique license, custom vehicle license, street rod license, temporary 24-hour permit, or permit license;
(3) a trailer, semitrailer, pole trailer, or mobile home having an actual gross weight or registered gross weight of 4,500 pounds or less;
(4) farm machinery, road-building equipment, a farm trailer, or a vehicle required to display a slow-moving-vehicle emblem under Section 547.703;
(5) a former military vehicle, as defined by Section 504.502;
(6) a vehicle qualified for a tax exemption under Section 152.092, Tax Code; or
(7) a vehicle for which a certificate of title has been issued but that is not required to be registered.