The attached image is from the original manual and is the same as on the tractor. It is not a dual fuel unit and is same as the unit as shown in top of picture. The top idle adjusting screw does not seem to have any effect on engine idle. No matter where I set that adjusting screw the engine seems to run too rich.[Kicks out black smoke as if the choke is closed]. The plugs then carbon up and start to miss.
I have made sure the float is not leaking and the float valve seems to operate properly. I check this by moving float with base off and blowing through the fuel input line.
Its as if the replacement idle adjusting screw from the OEM repair kit is not doing what it is should be doing, controlling the amount of fuel at idle. So if its not controlling it at idle it likely is allowing fuel to get through the port at all engine speeds.
The screw measures 1.080" from the base of the head to the tip.
It appears the original carb was designed to handle two fuels [gas and kerosene]but perhaps does not do a good job at either!
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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