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Farmall 400 fouling plugs

A

Anonymous-0

Well-known Member
Hi all, I have a 400 that is fouling plugs, I put a rebuild kit in it and it runs somewhat better but still getting a oil/gas mixture on the plugs when pulled it seems to be running very rich. I have adjusted the air in and out as much as possible to no avail, could it be the float setting? THanks for the help!
 
are you talking engine rebuild or carb? yes could be a heavy float.you need to adjust the main mixture at btm. of carb start with 21/2 to 3 turns out and go from there.idle adjust 1 turn open.float should be set at 1 5/16 btm. of float to top of body. give it a good workout and to operating temp.
 
Hey guys thanks for answering, yes it smokes white , and it was the carb that i rebuilt, as well as every thing from the clutch housing back so Im anxious to get her running good to plant with this year. This was my first major rebuild so Im kinda stumped that I cant get the carb adjusted right.
 
There are three external adjustments. The load screw is on the carb bottom front. It is a fine tuning screw on the main jet. It will tailor the fuel, not an absolute control. Normal is to start from about 3.5 to 4 turns out from a easy seated position. With it running at High Idle (full throttle no load) you should be able to get it to smoke a bit of black smoke traces. Thur it in until this goes away. Load test it to find out if it has black smoke under load. If so turn in 1/4 turn at a time till the smoke goes away.
The second adjustment is the idle air screw. Top of carb on body. It is for slow idle only. It leans out the mix when screwed out, and richens when screwed in. Set for best idle when warm. The third is the idle speed, on the flange area of the governor tube at the throttle plate. Adjust to idle speed. Recheck the idle mix when this is set, then the idle speed to spec. Several cycles of this might be needed.
White smoke is usually associated with coolant loss, not carb adjustment. Be sure it is not loosing coolant into combustion! JimN

JimN
 
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