Off-Road Small Spark-Ignition Engine Emission Regulations

9 (1) An emission control system that is installed on an engine to enable it to conform to the standards set out in these Regulations shall not

• (a) in its operation or function, release a substance that causes air pollution and that would not have been released if the system were not installed; or

• (b) in its operation, function or malfunction, make the engine or the machine in which the engine is installed unsafe, or endanger persons or property near the engine or machine.

(2) No engine shall be equipped with a defeat device as defined in paragraph 111(b), subpart B, of the CFR.