Regarding Visas in Mexico - is the FMM the visa?
Yes
It's a fair question because you're not alone in the possible confusion between travel visas and tourist visas. Here is an easy explanation:
Tourist visas (aka "tourist cards") like the one you're going to get, look like a traffic ticket and are issued at the border on the spot. You do not apply for tourist visas in advance as with travel visas, and they and are not stamped or stickered into your passport at all. In fact, you don't even need to bring your passport to the border - that is if you have a passport card vs passport book. There is nothing to stamp with regard to a passport card.
Travel visas are formal visas that must be applied for in advance via application through a foreign consulate. They can be issued to US citizens, most often in business situations, but for Mexico moto travelers they are never used.
Here's an interesting link that shows where in the world US citizens need a travel visa:
LINK
Scroll down in that link to Mexico.
A couple of notes:
(1) Your TVIP for your bike will only be issued with a period of validity that matches the period your tourist visa is valid - which coincides with how long your passport or passport card is valid. Informational only as MexTrek is such a short trip, but this tip may come in handy for the future.
(2) A few months ago when a bunch of us went downrange on dirt bikes in the Sierra Gorda we crossed in advance at Anzalduas to get tourist visas and TVIPs done the night before. In retrospect waiting in line to come back into the US wasn't worth the time. Of course, it was a Friday night and there was a bit of a line coming back in.