With respect, Carbs do not have a high Idle screw. That is a governor function. Low idle speed is a screw on the linkage from the governor. It screws through a boss in the upper casting and controls the speed of the slow RPM with the hand throttle moved to slowest engine speed. There is a larger brass knob top front (if I am looking at the right carb model) that is the main jet richness control. It is used to set the amount of fuel delivered under working loads and at or near the engines maximum power. Under load pulling an implement, (warmed up) it should be set so that all traces of dark grey smoke are gone from the exhaust, but just that. Too open and grey smoke. Too closed, and it will stumble and be too lean. It must be adjusted when stopped, and set in increments of 1/4 turn or less to finesse the full power richness. There is a smaller brass screw near the flange where the carb bolts on. It is low idle mixture. It is adjusted in tandem with the low idle speed screw. This screw should be adjusted in or out until the engine runs fastest when the hand lever is set to idle. then the idle speed set screw is adjusted to the desired slowness RPM. Then the Idle richness screw is adjusted again to slightly higher RPM, then using the idle speed set screw it is again set to the desired low idle speed. This back and forth setting results in a good idle mixture and easy transition to full speed and power when needed. Jim
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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