Thanks for the replies
The scooter is very new to me, I have put on less than 100 miles on it, and it has been running perfectly. I have owned multiple motorcycles and scooters, and earlier on in life was a motorcycle mechanic. I do all my own maintenance. I have a OBC2 reader and a GS911. The nearest Vespa dealer is over 100 miles away. On purchasing the bike, I did a complete check-out. Every thing looked good. It was in remarkable shape. The previous owners took very good care and maintenance on it. The previous owner said that he had replaced the water pump.
This morning I checked the scooter. The battery when I turned on the ignition was 12.4 volts. I cranked the bike and it was idling rough. In fact, it stopped running twice on warm up. At idle, the voltage was at 13.7v. But I couldn't rev the motor. I drove the bike around the block to warm it up. When I drove it back into the driveway, it died
I started it up again and revved the engine. The max voltage was 14.2 volts; so I think that eliminates the voltage regulator.
I know the tank has regular gas in it, so I will drain it and put in premium.
If the bike has a OBC2 or any other diagnostic port, where would it be located?
Thanks again guys