You might have trouble even if you have a socket wrench, it will slip around the filter over and over again. You have to tap the wrench onto the filter pretty tight. I sometimes tought that Kawasaki purposely used a slightly smaller diameter filter to force us to go to a dealership...
What work for me when taking off a stock Kawasaki filter is to put a screwdriver into the filter and turn it. You have to hammer the screwdriver into the filter. The entry point should be right where the sidewall of the filter and the endwall of the filter meets, and stick the scerwdriver in 45 degrees. Then turn COUNTER-clockwise.
Replace the filter with a purolator pure one with the sandpaper-like grip. OR you could use the K and N filter, #303. The K and N has a nut at the end of the filter, so it will be really easy to take off later. The purolator is good because a filter wrench will grip it positively.
Good luck.