Triumph Repair: carbs, john deer tractor, fluid resistance

Question
Howard
I own a tr-4 Triumph. Recently the carbs
were rebuilt by a shop in Long Island, Ny.
Following the instructions in the repair
manual for enriching and leaning out the mixture
it seems to make little or no difference how far
the mixture nut is turned. The mixture always
seems to be too lean.I hesitate to start tinkering
inside the carbs as they are freshly rebuilt.
                              Any thoughts on this
                                            Jerry

Answer
Hi Jerry,
The method of adjusting the mixture is to set the idle correct and check to see that you have the linkage between the two carbs correct restrict the air going into each carb a little at a time to see if both are carrying their load. Another method if you don't have a Unisen tool is to listen to the thought of each carb with a piece of hose to listen to the hiss they make at idle. Once you have done this lift the spring loaded pin under the edge of the front carb and note what the engine does. If the engine speeds up and stays fast the rear carb is too rich and you need to turn the nut UP by three flats and lift the bottom linkage up against the nut. Always adjust by three flats at a time then lift the linkage and rev the engine once between adjustments. If the adjustment of the rear carb is too lean the engine will cut off. Keep in mind that if you did not get the linkage correct between the two carbs it also can quit when you lift the pin. If the mixture is correct, the engine will drop off to a very slow speed and sound like an old John Deer tractor. (or a four cylinder engine running on two cylinders slowly)
Lifting the pin on the rear carb is checking the front carb.
When you have a correct idle and if you lift either pin the engine will drop off and run on two cylinders. Then remove the hex on the top of each pot and lift them up and push them down. If either does not have a fluid resistance then put oil in the top (engine oil) The resistance is what takes the place of an accelerator pump in a regular carb so it is important.
let me know,
Howard