I just purchased my first ZTR after having a basic CC XT1 for several years to start doing some neighbors lawns on the side (2-5 at the very most). While I scored a heck of a deal on a 2019 left over, I stupidly didn't really check the engine thinking they were all the Kaw 21 HP engines, but as soon as I finished my first cut realized it was the 18 hp Kaw. Is there any reason they discontinued putting the 18 hp engines in? Obviously, now I have some concerns (may be unwarranted) regarding power issues, but having just put an hour on, I haven't noticed any power issues even on my pretty steep hills.