Can I park a motorcycle on the sidewalk in San Francisco without getting a ticket?

No.

I can't speak to S.F. specifically, but I have a scooter in another major city (Philadelphia) that I also park on the sidewalk, where I've learned some tricks to keep from getting tickets. It's not legal, but often Parking Authority people will turn a blind eye to it. However, are more likely to ticket you in a high foot-traffic area, if you leave it there for a long time, and if it's not on the curbline. I would also guess that if your motorcycle is quite large, it's more likely to get a ticket.

No. The DTP will ticket you. And I don’t remember the exact amount, but it wasn’t cheap at all.

The SF DTP is some of the best in the world. They amaze me.