I would be suspicious of the carb for the puttering. Amal concentrics are not really very good carbs. If it original or been on the bike for few miles then I would look at the idle circuit and/or replacing it with a brand new one, or better yet a brand new equivalent size monoblock (which in my opinion)is a better carb.
As for the spedo its most likely the cable. The inner cable should pull out from the spedo end and have square "tenons", as you call them, at either end. My bet is its broken. If you get a new one get the whole thing (inner and outer). They're available any where that sells vintage british parts.
Mike O.
As for the spedo its most likely the cable. The inner cable should pull out from the spedo end and have square "tenons", as you call them, at either end. My bet is its broken. If you get a new one get the whole thing (inner and outer). They're available any where that sells vintage british parts.
Mike O.
