I saw this photo on the web and fell in love. Here's the info that was with it.
750 Trackmaster Yam. One of 3 built in '71-'2 at Mike Lacoco's Yamaha of Alamagordo dealership. Built for their rider, 'Wildman' Joe Pierce. Joe loaned me this one in the summer of '76. I raced it in the Pikes Peak Hillclimb and at Sertoma International Speedway, Las Cruces, NM. It is now owned, freshened up and displayed at bike shows by a California gentleman.
Not sure about those Jubilee clips hold the headers on, but the rest of it is dreamy. It's been restored now. I'll post details soon.