Here in this state (and all the adjacent states in the west), they do not mess around with fire restrictions or regulations. If you start a fire on your own land, or on BLM land, FS land (national or state), be it from fence welding, chainsaw activity, or with a pack of matches, you are liable for any fires started by you, or as a consequence of your activity or from managing your property and/or logging. The later also means things like if you leave unburned slash piles and lighting strikes it and starts a fire, you are liable for the fire. Generally here you must also burn your slash by law in the wet season. You must also have a minimum of fire suppression equipment handy when wood cutting here in most places, like shovels, rakes, extinguishers, etc. The fines vary by state/region/county/reservation for removing spark arrestors on any type of vehicle or chainsaw. 'They' here means any number of law enforcement like state police, sheriffs, local police, fire district personnel, fire crews, OSHA, BLM, USDA, Indian Reservation police, state and national forest service, yadda yadda.
Also any and all forestry and logging activity here in the west is strictly regulated during fire season. They set up time of day restrictions in 4 phases here: normal/unrestricted, semi-hoot owl, hoot owl, and closed. Hoot owl restrictions limit the time of day that you can cut and perform certain logging activities, like chainsawing, skidding and truck loading. Generally it is designed to keep you from starting fires from logging activity during the hottest hours of the day, depending on conditions which change over the year and from year to year. And it does not matter where you are logging; private land, BLM, forestry land, or whatever. Restrictions apply to the entire area of the fire district that you are in. They generally exempt urban area arbor work and the like, but it varies by district, county and state.