Make your own longer cable:I have that carbureter and the choke control is not very attachment friendly. The choke cable is too short to reach the handlebars and I had to rig it ineffectively to the the large top bar on my Micargi bicycle. I am very interested in finding a handlebar choke control that will take the barrel shaped end of the cable for use on my new Dellorto carb.
BB
http://motorbicycling.com/f39/norm-shortening-throttle-cable-9010.html
With Norm's technique, you can make any cable length you need out of a bicycle shifter or brake cable.