No fire to plugs on kawaliski 19 hp. lesco commercial mower

Bad fuse, plug,plug wire,ignition coil,ignition coil wiring,badpick up sensor,faulty cdi,cheers

Are the pugs new?, If not - replace them. What color were the old plugs? if they were black -soot covered, carb cleaning and setting is in order also.

Battery fully charged? Make sure the pug wires are good, fully seated connectors, etc,. If the easy things didn't help. /you need to get the coils checked. If this engine has point's and a condenser, the condenser would be my first suspect, makes sure the points are opening and closing.
If no points, the electronics need to be checked with resistance (ohm's) values,,, these are found in a factory service manual...-- Dealership.
if this happened "all of a sudden after you worked on it" you may have pulled a wire loose.