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I ride mine unless it is snowing or something and below freezing.

Did you forget your phone on the beach and the tide came in? My daughter lost one that way out in Santa Monica. Landlubbers forget about tides..... Small lakes and rivers don't have tides. River levels get interesting when dams or storms are involved.

My 'new' scooter had a 'new' battery but it lost a cell even on a battery maintainer.

You can get your battery tested at some parts stores. Ask if they have the proper equipment rated for use with small batteries. Many shops do not have the proper equipment. Charge the battery before you go with a good 0.5-2A charger or they may try to charge it with a regular automotive 30A charger. Charging instructions may even be printed on the battery.

When you have a known good charged up battery check your system voltage at the battery as Bashan suggested. The charge voltage with the scoot running should be 14V +/- 0.5V.

Your voltage regulator may be bad. They are cheap and you should keep a spare around. TVN can supply a good one. There are some instructions for testing a regulator but I would not trust them since there are several different circuits used by manufacturers.

My scoot normally has only a single tiny wire and fuse coming from the battery that supplies power to the ignition switch and everything else. That makes testing for a parasitic drain fairly simple. The ignition switch should turn off everything. The big wire goes to the starter relay. I have additional circuits on mine that I have added.

Alley is correct about the AC/DC scooter question being only about the CDI power supply. His first test for a DC CDI is good. However I would not use Alley's second test for a AC or DC scooter. I have seen too many schematics and vehicles that will continue to run without a battery. Disconnecting the battery also produces 'load dump' transients on the system. It might 'work' with some scoots but personally I don't do it.

Missing could be due to a mixture problem, air leak, fuel delivery, or an electrical problem.

I hear Thailand is a little 'unstable'. Vietnam is industrializing just like China.

Your PS is correct. Modify the circuit if needed and switch the starter relay with the remote. Most scoots have safety switches so the brakes must be on before the starter will operate.

I had dual 18/18W High/Low halogen headlamps that were too dim to see anything. There was also a lot of light reflecting off the decorative 'guard' over the lights and light leaking from the back of the chrome plated plastic stock reflectors. That light leakage ruined my night vision also. The 18/18W bulbs were only available from the manufacturer in China. If I remember right that is a violation of the DOT standards.

I removed both of the stock lamp assemblies and replaced them with LED assemblies. The LED replacements are not DOT rated. Fortunately my scoot falls under the bicycle lighting rules in Kansas which means my front light must be a 'white light visible from 500 feet'.

The stock assemblies were labeled DOT but I also noticed that rating was for a 5/5W bulb. The stock assemblies also had a small #194? bulb 'marker' light in them that came on with the ignition switch. I wired two LED billet bullet lights into that circuit.

When I wired up the new lights I used a couple of diodes to make both front white light 'headlights' come on in HIGH and only one in LOW.

I had the proper connectors so I just made up a new wire harness for the lights that plugs right in to the existing wire harness.

I saved the stock fixtures and wire harness in my pieces-parts leftover box. That box also has a rev limiter and a nasty buzzer alarm like they use as a backup alarm on construction equipment. It also contains the tiny 'free' trunk and the front bumper for the scoot. I reconfigured about 1/3 of the electrical wiring harness. Sea air and LA smog did not do the scoot any favors. There were two bad switches that had oxidized or corroded to the point they would not make contact. I had to disassemble and clean those switches. The schematic for the scoot did not show much of the wiring or was incorrect.