Problems with sears riding mower. My sears rider skips grass when mowing. I leaves a 2 1/2 " swatch of grass that is skipped. This spot is on the right side of the carriage. I have sharpened both blades. I also have then on correctly. Not sure beyond this point what else it could be.

Have you checked to see if the pulley isn't frozen and turning freely on that side? Possible, it happened to mine.