So they will ship a non-Kal motor to Kal? Most places won't. We will see cuz after I read your post I ordered one and got a confirmation order.
I already have the Kal certified one on my Yerfdog and am in the process of breaking it it. The difference I see between the engines is the Kal one has a little catylatic converter on the muffler and a vent hose on the gas tank. Since I put a different air filter on I didn't know what to do with the vent tube on the gas tank though so i just ran a long fuel line hose beneath the kart. There is probably more difference choking out he engine than is physically visable. BTW, had to pay $7.75 tax so with shipping the total was $114.73.