Carb Balancing Problems

[limax2]

Thanks Limax2.


So why is the butterfly in carb number 2 moving in my original carbs, but not in carb number 1? Have I installed the replacement carb number 1 incorrectly?


Good idea about the diaphragm swap. However would first like to resolve the inconsistency of the butterflies opening if possible. From what you say carb number 2 butterfly should not move when adjusting the balance between number 1 and 2. Except it does!

Having studied a set of carbs on the bench I am struggling to find an answer to this.
I agree the butterfly thing needs sorting before bothering about diaphragm that is probbably o.k. anyway.
First check again that the butterfly adjuster, springs and anything else between 1 and 2 are a mirror image of that (undisturbed) between 3 and 4. This to make sure you have not missed something when fitting number 1 to the rest.
Does it all look the same on your spare carbs between 3 and 4. I'm fairly sure it will be as I don't know of any changes made in that area.
I don't want to insult you obvious talents but will mention that putting pressure on the adjuster between 1 and 2 can move both butterflys against the pressure of the spring opposite the middle adjuster. (The same does not happen between 3 and 4 because of the idle stop. The middle adjuster moves 1 and 2, leaving 3 and 4 against the idle stop thing).
Keep us informed and I will come back if I can come up with anything else.