So after complaining to the Bajaj Scooter group about the debacle at the testing center, I got a pointer to Penndot's own website, and this Motorcycle Fact Sheet

I quote:

DEFINITION: A motor vehicle having a seat or saddle for the use of the rider and designed to travel on not
more than three wheels in contact with the ground.
CRITERIA: 1. Horsepower is more than 5.0.
2. Inspection required.
3. Motorcycle plate issued.
4. Helmet and eye protection required for driver and rider.
5. Annual registration fee is $18.00.
6. Class M required on Driver?s License.

Damn it. The Chetak has 9.0hp. I called Penndot to get confirmation. The first time I called I got a complete idiot operator, I hung up and called back. This time I got someone who could at least read, but was unsure so he passed me up to a supervisor. Finally someone with a clue. She sorted the mess out and started the paperwork to get an official response for me, and to send an update to the testing center if needed.

I'm still pissed more about losing the time than anything. I really was hoping to have this over and done… I've got way too much on my todo list.