You ought to check the Texas laws.
I did a quick check and found that Texas motorcycles don't have to go thru emission testing but they seem to have a "safety inspection".
Here's a link to one thing I found
http://www.airchecktexas.com/Emissions Testing Procedures
Is your vehicle required to be emissions tested?
All Texas registered vehicles are required to receive an annual inspection. All inspections include a comprehensive safety inspection; however, some vehicles are required to have an emissions test in addition to the safety inspection.
Which vehicles are required to have the emissions test?
Vehicles registered in designated counties. Designated counties include: Brazoria, Fort Bend, Galveston, Harris, Montgomery, Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, Travis, Williamson and El Paso counties.
Gasoline powered vehicles.
Diesel powered vehicles and motorcycles are exempt from emissions testing, but are still required to have the annual safety inspection.
Vehicles 2 through 24 years old OR upon expiration of the two-year initial inspection sticker.(Boldface added by me).
You might want to give them a call.
I know some of these regulations can be out of date and if your lucky, motorcycles might be exempted from the yearly safety check.