Scag Tiger Cub - STC48A-19KA 48" mower, 19 hp Kawasaki motor. Last week I mowed for the first time this year. The mower seemed like it was a little low on power. I figured the blades probably need sharpened. Headed to a different location, I stopped and got gas. When I tried to mow the next place, the mower wouldn't hardly run. I thought maybe it was bad gas. I tried different gas. Still won't power up properly. Seems to run OK but when I kick on the blades it seems really low on power. Sometimes the motor acts like it is fouling one of the spark plugs. It probably is. Today I wondered if the air filter was plugged up. I took off the cover and pulled the filter. It doesn't LOOK bad. I never tried it before, but I started the motor with the filter OFF. It runs GREAT. I don't want to run it without some air filter. Is there something I am missing? How often do you change the $$ paper filter? In looking online for new filters, I see that there is maybe supposed to be a foam wrap that goes around the paper air filter? That foam is probably washable. Is that foam wrap missing and causing me troubles? Do you have a foam filter wrap? I though about trying to figure out if there is an adjustment on the carb. Is mine just set too rich and with the air filter on there is restricts the air intake just that much to make a difference and make it run bad? The fuel filter never looks like it has fuel in it. My fuel filter is right there beside the motor. The filter is clear plastic. It is inline between the tank selector valve and the fuel pump on the side of the motor. Does your fuel filter look empty, even with the motor running?