Posted by 36F30 on November 07, 2011 at 10:12:11 from (71.38.172.106):
In Reply to: 1937 f20 settings posted by merlynr on November 07, 2011 at 07:24:42:
On the carb, The screw right where the governor tube connects (has a small spring under it) is the idle stop screw and sets your idle speed. The one on the top middle of the carb is the idle circuit mixture screw and the big one in the middle is the main adjuster. Pre set at 1.5 turns out for the main and 1 out for the idle screw. Since you said it runs don't change them just start it. Then you can adjust them. Open the throttle and then turn the main screw out til it flutters ( keep tract of turns ) then turn it in until it flutters. Set the screw in the middle of these two points. Then slow the engine down to idle and use the same procedure along with adjusting the idle stop screw. An initial setting of that screw would be just barley open on the throttle butterfly. But if its in too far your engine will not idle down or respond to the governor. Setting a carb takes time and patience and unfortunately with a hand crank lots of cranking if you move the screws too fast and kill it.
The valve setting is .015 hot, so about .018 cold
This post was edited by 36F30 at 10:19:16 11/07/11 3 times.
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