My friend Hawaii Ed runs crazy speeds over 50 mph on the flats. He's tricked out his HT engine and runs a shift kit.
I run either a 4.25 hp GP460 engine or a 2.8hp Tanaka 47R on my shift-kit bike.
My top speed was 45 mph. The engines have power to spare, but the rider backs down. I love the cruising speeds between 25 mph and 35 mph. Over that, and it's a race with Death for me.
Besides, how am I going to explain to the judge that I was going over 10 mph past the speed limit?