Well, for what it was worth, I uploaded the primary vehicle from the trailer, and now the title is here:
http://www.imcdb.org/movie.php?id=60807

Back in 1966, there was a teen-beach movie called Out of Sight (1966): which was made back at the time when beach movies were on their way out. It has a lot of custom cars as well as one motorcycle built by George Barris, most notably The ZZR. Here's a trailer:
http://www.youtube.com/watch?v=mvaRFPXVwcg


The thing is, it's not on DVD, and as near as I can tell, not on VHS either. So is anybody else willing to capture this movie?