HuaSheng or Honda?

While the Huasheng motors are really reliable (extremely reliable for a cheap chinese motor- azbill on this site has 17,000 + miles!), the Honda will be even more so. It is just overall higher quality- every piece of metal, plastic, mold, cast, etc. is of better quality and has a lower tolerance for what gets pushed down the production line. Note that most recommend immediately replacing the carb on the Honda. (not sure if that is linkage related or because it is a water pump motor and the carb is for idle - load operation only.)

The Honda has slightly more power due to a very small difference in stroke, which also ups the compression. This and the combination of every component being slightly higher grade gives you increased performance and reliability. FYI I personally have not ridden them back to back to verify actual performance difference.

Since it sounds like you will be commuting on the bike regularly, the extra money spent on the Honda is probably worth it, but I'm sure you would be happy with either one.

Do some searches on the site and I'm sure you'll come up with more info and opinions

BTW the cam swap is pretty simple if you have any internal motor experience. Just make sure you pick up some Hondabond or permatex gasket maker and that it is timed right when it goes back together. AGK might have a how-to on their site and I'm sure would help you out if you have any questions.

The HS is pretty reliable,,,
I put 17,000 miles on mine and never even pulled the plug, just changed the oil and filled the gas
the Honda carb will need to have a throttle linkage either fabbed or purchased, whereas the HS is good to go right out of the box

upgrades are not necessary, but some like the extra oomph
you will be happy with the Q-Matic, whichever engine you decide on

For daily comuting, get the Honda. If you are just cruising and running errands, the Huasheng will do the job for less yen.

never had the honda but the hs is a realy good deal the problem with these bikes isnt realy the engine but the mounts screws etc

I've put miles on both the GXH50 and the HS - the HS is a great motor IMO. I don't think the GXH50 is worth the extra $130+.
Sometimes the GXH50 costs twice as much or more. I honestly don't think it's twice as good as a Huasheng.

The Honda will be a little quieter and make slightly more power, but it's just as susceptible to damage from overreving as the HS. In fact, my brother's GXH50 needed a rebuild before he hit 2K miles on it. Either way you go, if you keep the RPMs under 8K and the carb clean, the engines should run a long time.

Oops, spaced out answering this thread!

The cam is not a big deal to change out. There used to be a video of the swap on YT, but it's been taken down.
Scotto has done a few cam swaps, he has some nice pictures on this thread: http://motorbicycling.com/showthread.php?t=35911

engine - 4 bolts, throttle cable, fuel line, kill switch wires
trans - 4 mounting bolts, drive chain, trans support (if used)
I think that's about all

You can remove the engine and gearbox as one unit from the bike pretty easily. Shouldn't take more than 5 minutes.