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Thank you for all the advice! I managed to remove the nut after repeated applications of WD-40 and just getting a bit western with it. Fortunately nothing broke and the wheel came off fine.

Now maybe I can actually get the tires on...

Thanks again!

I bought this kit:
www.ebay.com/itm/100cc-Big-Bore-Performance-Power-Pack-Big-Valve-Performance-Head-Black-Exhaust-/151047655363?pt=Other_Vehicle_Parts&hash=item232b244fc3

It includes a big valve head with the same size valves as the head you're looking at (according to the seller).  The box the head on my kit came in looked exactly like yours too (Growsun), so I'll give you my 2 cents.

I upgraded from all-stock parts to the kit you see here, so I can't tell you how it compares to other heads.  In my experience, the whole kit runs real well.  The only problem I've had is the base gasket included in the kit melted after a couple weeks.  I've since replaced the head and base gaskets with a Hoca set and it has been scootin' along just fine ever since.  Also, I ride a Boatian 50cc, so I don't know if the odometer registers in miles or km, but I have put about 500 on the odometer since I've installed the kit and I have no complaints yet.

Hope that helps!

I did a search on the user name on this forum and couldn't find anything, so I figured I should post my experience on the ebay.

I bought his 50 mm BBK complete package as seen here:
www.ebay.com/itm/100cc-Big-Bore-Performance-Power-Pack-Big-Valve-Performance-Head-Black-Exhaust-/151047655363?pt=Other_Vehicle_Parts&vxp=mtr&hash=item232b244fc3

I bought it during a sale at about $180.  I needed a pretty thorough package to rebuild the top end, replace exhaust, etc on my dying (used and beat to...well...you get it) scoot.  It was either this full kit or buy a BBK, exhaust, carb, and cam separately from wherever, which would've been nearly the same price as all that I got in this kit.

The seller is really good.  He was upfront about known issues like the head pipe not fitting all models, as well as providing his own fixes.  The package arrived and one of the gaskets was torn and the A9 cam had a big gash in one of the lobes.  I told him and sent him pictures and he sent new ones the next day at no cost to me, no questions asked!  Good experience, and all of the parts I have installed work great.  I haven't installed the CDI, the variator, or the spark plug cable yet (just haven't had time), but my scoot runs like a champ.  If I get around to putting those in, I'll update on their performance too, but they appear to be pretty standard parts found elsewhere too.

My only complaint is that the kit included some parts I didn't really need, but maybe I'll be glad I have them at some point in the future.

Summary: Good experience, quick shipping (to HI nonetheless), fair price in my experience, treated me well, and my scoot runs like an entirely new machine and I can't get enough riding in!  I recommend his stuff if you're considering it.

It has been a few days, have you managed to start it or make any progress? If not, be patient and start ruling out potential causes. You'll make fewer mistakes if you take your time and slowly follow everything.

Also, if you follow the right steps and figure out how to get this scoot running, you may be able to fix the other scooter you have too. Don't give up!

Thanks for the warm welcome! I've been able to work through most of the basics and the well-covered topics (maintenance, install new parts, BBK, etc), but now I'm starting to have more specific questions, so it's nice to see that a forum like this exists.