Is that three brake master cylinders on your Double

Yags,

They were all three brakes Mike. The one on the left handlebar went to the rear wheel, used to load the clutch and also if I felt the tire get loose off the line I could put a little load on the rear wheel and eliminate smoking the tire. Also using it to load the clutch it gave me the feel as using a clutch to launch with, good for mental timing.

Hand operated Sliders

TC and I both ran a hand operated slider clutch in the 70's, TC's was the best. They were so hard to operate that TC had a alloy ring he slip over the handle bar and clutch lever until time for burn out and run. Mine was so hard to pull back I couldn't sqeeze it I had to jerk it back and take a hand full and hold it until I needed it. Man, my wrist would really be sore after a weekend of racing. And don't forget we didn't have wheelie bars to keep the front end on the ground, that was done with the slider. I've always wondered what my bike's would have done with wheelie bars, I really had to fight to keep the front end down. I can see the advandage of the wheelie bars, with the right adjustment you can put more weight on the rear wheel for more traction, WOW! And yes, I have watched the fuel bikes of today and the horse power is awsome, what a ride that must be.
Note: I never went up in smoke on a race run, TC didn't either but we could if we wanted to.

NHRA Musuem

This is the Bike that got runner up at Indy, 1973, I had just build this bike, it had a Lenco Trans and a six inch M&H tire, the motor was 102 inches. In high gear it was 273 to 1 ratio. You notice the Sportster Clutch set up including the Sportster Compesating Sprocket. It turned a best of 8.64 at this race.
It's shown here in the NHRA Musuem, it was there for about four years. A guy named Williams of Santa Barbara, CA owns it.

Maybe 200

KNOWING THE WAY MY DOUBLE WAS RUNNING AND THE THINGS THAT WAS HOLDING IT FROM BETTER TIMES, IF I HAD THE FUEL CONTROL AND CLUTCH, I KNOW I COULD HAVE GONE 200!!!!! THERE WAS ONE SIZE BIGGER TIRE TO GO TO AT THE TIME.