This is my 1959 YAMAHA YE1. That's right YE1, not YD1. This is because Yamaha made "E" variants of all the factory's 250 twins until the mid-1960's. The only difference was the use of over-sized pistons, bringing the displacement to slightly over 250cc. I've never heard an authoritative explanation for this practice. I suspect it had something to do with license classifications in Japan. These machines were rated at 14.5 HP @ 6000 RPM. At any rate, this is an excellent, complete example of what is a very rare bike, these days. It's original except for a repaint and seat-recover done by the previous owner.This bike earned a couple of trophies at the 1996 Del Mar Concours, including 2nd place in the '50's Japanese class and 1st place Member's Choice.