This is the Pierburg(or Zenith) 34/34 2Bx carb: This carbs found the 1.9 WN engine and the 1.6 YP engine.

http://www.love-is-freedom.com/verbr...gaser/z2b5.gif

If whit this carbs feeding the 1.8 DZ engine , about 100-110 BHP, but a little more torque...:hmmm:

ergo the single Weber similarly 100-110 BHP :)