Has Zen and the Art of Motorcycle Maintenance got anything to do with Zen?

I read Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig a few years ago and really enjoyed it. However I'm not convinced it's got anything to do with Zen . From what I remember the protagonist spends a lot of time fixing his motorbike and contemplating the notion of quality. But does the text link into Buddhism generally and Zen specifically? If not, why has it got Zen in the title?