Hey Don I think this is from the same race as your picture, up above Mojave in Red Rock Canyon area which was shortly closed off to racing in the 70's. Race photo's by Brian Klock, long before Grumpy was in the desert.
Starting line of B to V 1969
Lucerne Valley race after B to V with a little lower number.
My life long friend from age 2 years Terry that I lost to a heart attack in 2005 & I in the late 70's. He had a 78 RM 250 & I had a 75 125 Elsinore. Great memories.