Heck, they race chainsaws, and they don't even go around a track LOL
Apparently Jim's mower is just one of those wimpy 'off the showroom floor' types and he's simply jelous that he's not mastered the art of getting big hairy balls out of little tiny engines.
Race a Briggs 'stock appearing' class kart sometime but try not to wee yourself when you suddenly figure out you're going over 100mph 2 inches off the ground in a pack of rabid drivers. hehe