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Ok, M13 fitted. The ringing sound is gone, and the sharp is still a little remnant, most likely because I did not dare to destroy the nut, and probably did not tighten it enough.

Can't believe that superiorpowersports promises a PDI, forgets exhaust nuts, and engine oil, and transmission fluids!
I'd call that no PDI done to the bike!

I also found some high temp locktite (the white one), but on the bottle it says it's made for things like motor bolts and nuts, and for radiators etc; not really for exhaust.
Any recommendations on aftermarket nuts and locktite/glue for exhaust?
I presume they installed the nuts with vinyl locking, which probably melted after the first run...

The rod is 8mm. Would it be M8, or M10?

Ok, I went under the 'hood' and found the source of both the ringing sound and the sharper sound came from the exhaust. The exhaust is mounted with two nuts to the motor with an item like picture below.

Much like the picture, but not identical.

Both nuts are gone, and the item of the picture is ringing on the exhaust pipe.

So I got to find the right bolts now.

Sorry,
I have a BMS TXB 260 EFI.

Nothing is dragging, no friction anywhere, just the motor is starting to make more of a sound of 2 hammers slamming together!

I suppose there's more to see than just adding a cylinder isn't there?
I ask because if a scooter could have been made with twin cylinders, they would have done so long time ago...

It seems you mainly find twin cylinders on heavy cruisers, touring bikes, or sportsters, that need more than what a single cylinder can offer.

Perhaps a single cylinder would create too much heat, too much torque on the chassis when ignited, so the motor vibrates back too hard when the piston is no longer under load...

Then there's probably the added cost and complexity of a motor with more than one cylinder; another reason why they won't build multi cylinders on a small scooter, that meant to be affordable.

It's logical to say that a twin cylinder engine will have more torque and power than a similar single cylinder engine; and thus use up more gasoline.
However, if a balance is found, eg: Comparing a single cylinder 150cc, with a dual 50cc (100cc), and both engines would perform about the same, what would their gas mileage be?

Basically, if their acceleration would be the same, shouldn't they have the same gas mileage too? Most surely the engine would run more smoothly, less noisy, smaller exhaust, and much more reliable too! (in case one spark plug would break, there's still a small cylinder to drive you home or to the nearest garage).

There are many benefits to dual cylinders.

I just don't know, if dual cylinder automatically means more gasoline usage. After all, you'd also have more power, better acceleration, and more smooth ride with 2 cylinders!

I'd say wind optimization; make sure you have the aerodynamic plastic plating in good order.

Also reduce the load on the alternator by putting a switch between the radiator fan. Turning it off when driving high speed.

Get rid of a wind shield, and duck forward when driving.
Get rid of any passenger backrests, or back storage bin.

Use premium gasoline, it will make a small difference (93 octane on gas station)

Enlarge the air filter, if possible make it so, that air gets forced in the air filter by wind movement caused by driving.

Tires fully inflated
Gasoline tank full (reduces drag on fuel pump).

Clean/replace filters (air/fuel/oil)

Perhaps put a slightly larger exhaust pipe; most of these bikes have an exhaust that is optimized for little sound, but have some back pressure in them, that does not allow the cylinders to get completely empty of their burned gasses.
A bigger exhaust (with larger airflow) should improve bits.

Put SAE 10W30 in the motor, it gives a performance gain over 15W40.

That's about it

Concerning the brake fluid, I've looked around in stores, and found only DOT4 and DOT5 fluids.
You think they are interchangeable (meaning DOT5 fluid can go in DOT 3 rated braking systems)?