This is always kinda funny to me because back when they were still rated at 29 hp, most guys thought they were a strong engine that were more than enough for the application. Now, even though they have the same exact power they always did, many guys are worried about them being "weak". They aren't. I have the FX850 which is only 1.5 hp more on the same engine block, and it has more than enough power for anything short of bush hogging.
Read all about it here. Click on where it says learn more about critical power etc, plus you can look at the actual engine specs-