California Air Resources Board

The small off-road engine (SORE) category consists of off-road spark-ignition engines that produce 19 kilowatts gross power or less (25 horsepower or less), including lawn and garden, industrial, logging, airport ground support, and commercial utility equipment, golf carts, and specialty vehicles.  More information regarding the California Air Resources Board's SORE program can be found in the Small Off-Road Engines Fact Sheet and the Certification Guidelines.