The solenoid controls the LOAD or high speed circuit in the carburetor. Smoking at idle should be cured by backing out the idle mixture screw. On this carburetor counter clockwise is leaner on the IDLE screw. Another possibility is a needle and seat that is intermittently leaking fuel. Another possibility is the idle air bleed or the air supply for the idle air mixture screw being plugged. Still another is a plugged air cleaner. An M Farmall does not need high octane fuel, that is just nonsense.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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