Postby Hasbeen » 05 Feb 2014 00:07
Sorry Gareth, I misread your original post. I just assumed, I guess, that you were removing waxstat jets, rather than fitting them.
As for starting on 2 cylinders, I assume that it is starting on one carb feeding those 2 cylinders, or am I getting that wrong too. I assume you have balanced the suction on the carbs. If so which method did you use.
Most obvious would be just one choke is being applied. How does yours work? Is it one cable with the chokes linked, or the 2 cable type? Is it still doing it with the jets fixed, or only since the jet change?
If only one choke is being applied, that would cause the problem. Remove the dashpot & piston, then operate the choke. Are the jets both moving, & is the movement equal? Correct if not the case.
How are your valve clearances. If an inlet valve is riding, burnt out, or has very little clearance this will give the problem. When it happens you can hear a flutter in the suction hiss from the carb feeding that cylinder, when using hose in ear balancing, which will not be there in the other carb.
If this is the problem it is impossible to get the idle smooth & steady, but the car can run quite OK when driven.
Did you use the hose in ear method of balancing the suction. I have no idea what the little ball in one of those balancing machines does in this case.
Fortunately our valves & seats are hardened, & can absorb such punishment for a short while, without permanent damage, if corrected. I know of one 7 that ran with a riding valve for at least a couple of thousand kilometers, & did not require a head off repair. It happily did thousands of Kilometers after correction without trouble.
Hasbeen
