no they are not due to carb emissions.
Low Emissions Vehicle
Partial Zero Emissions Vehicle
adjustment screw is between throttlre linkage and carb body on the right side of the carb as you stand at the front of the car looking at the carb
Emissions, Auto Transmission
On-Board Diagnostics
Sure you could do that by replacing the intake and TB with a carb. Your emissions will go up, your mileage and drivability will go down. I would not suggest doing it.
The best example of an ultra low emission gas mower is the Honda HRS216PDA. It's engine is CARB compliant and delivers huge fuel economy and low emissions.
It is illegal to remove any emissions control devices from a vehicle.
Light Amplification by Stimulated Emissions of Radiation
4 speed 4barrel carb duel exhaust
California Air Resources Board or CARB sets the emission standards for California. California has been well known for years as having tough emissions standards for vehicles destined to be sold there.