From what I've seen, no one's actually figured out what exactly gives the "Super Titan" more power. It's the Honda GXH50 that has a longer conrod than the HS, worth a little over half a point in compression (and about 10-15% more power). If the Super Titan has a longer conrod too, that wouldn't surprise me, as raising compression from a low 7.4:1 (on the reg HS) would be the quickest and most viable way to increase performance.
If someone has figured out the differences in the Super Titan, please direct me to the post, as I'm extremely curious to read it.
Until then, it's my opinion that it doesn't make as much power as claimed. But then, the HS is the same way: it doesn't make much more than 1.8-1.9HP bone stock.
Some places online are claiming up to 2.5HP for the HS... Now maybe broke-in with all the good mods on it, it will, but not stock!