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The YY250T's we have here have shit for electrical.
Your symptoms (intermittently working) are indicative of a wiring problem. Which isn't anything remotely resembling a surprise with the workmanship and quality on them.
I had the same sort of issue on mine, with the tachometer and display lighting becoming flaky at high engine RPMs. It was primarily due to a crap connector (where the main wiring harness comes up and connects to the instrument cluster).
The best fix is to replace every single connector with a Weatherpack connector.
That will be expensive, especially if you don't already have the crimpers. You can get by for a bit by compressing the pin receptacles (sockets), but it isn't a long term fix.
Also, they had an unfortunate tendency to use wire nuts, and to twist wires together AND do a complete crap soldering job on them, wrap it up in electrical tape, and hide the abominable connection inside the split loom tubing. Inspect these and repair if needed, there will be at least two of these, one on the green (ground) wire and on the brown (DC power) wire. If you see more than one wire of a given color enter one end of the tubing, but only one wire of that color exiting the other end, open it up and fix it.
Try not to look at the radio if your bike has one. You can't un-remember it.
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