12-03-18, 03:14 PM
How much force does it take to rotate the butterflies?
The springs are quite stiff so it should feel uncomfortable pushing the pulley with your thumb. If it opens with little resistance check the two springs are not broken and the inner ends are fixed to the pulley and outer ends fixed to the bodies of carb 2&3.
On the other hand, if there’s massive resistance to rotation that the springs can’t overcome then it sounds as if the shaft either has got corrosion jamming the pivots… or the entire assembly has been dropped and things are no longer straight.