Hi David and Richard. The other purpose of my post was to try and discover which carb fitted which bike. In the mid 80s I bought 3 basket cases. 20yrs later i’m putting them together. However !!! there are 4 carbs. One with no identification and with bottom feed to the float chamber was loosely fitted to the 1947FS. Of the other three,two are marked (rather amateurly) 6/151 and the other GT 9186. Any ideas which bike needs which carb. 1929/500 and 1936/600. Je ne sais pas .!!!