Posted by pete 23 on February 29, 2012 at 10:04:27 from (74.32.238.142):
In Reply to: Modern spark plugs posted by Fritz Maurer on February 29, 2012 at 07:11:59:
The 560 was spitting and sputtering when opening throttle long before ethanol was even thought of. The 460 was worse and IH finally came with a zenith carb with a vacuum operated accelerator pump and that worked quite well. The biggest problem with the spitting and sputtering is the intake manifold. It needs to be clean inside of the heat stove where the exhaust gas circulates around the intake . So many guys pull the manifold and leave it in one piece when they have the head off for service. I learned a long time ago to take them apart each time and then they come apart quite easily . That valve in the manifold erodes away and or gets stuck. The spring looses it's tension so valve flops open too easy. Also, the position of the slot where spring hooks is sometimes not correct to get enough tension. A quarter turn of tension is minimum, little more is better. Also, the carburetor was changed a few times, one being to a single venturi to reduce icing problems. The 560 never came from the factory with a electric shut off. That was introduced with the 706 on that engine. All had adjustable main jet but the main jet was calibrated for full load and the intentions were to reduce fuel slightly under light loads. That theory did not work very well. About 3 1/2 turns gets you full fuel but they said to give it five turns out at full load to be sure the needle was not restricting the fuel. I used to run many on the dynamometer with the fuel metering tool hooked up to check fuel consumption. It was easy to tell where you started to restrict the fuel. Sometimes, it seems one has to enlarge the main jet with today's fuels. This has to be done very carefully as it is difficult to find new jets for them. I used the last one I had on hand on a carburetor someone had gotten way carried away with.Ignition timing is often incorrectly done. It must be done at full throttle. That is where it is important. Factory settings was 30 degrees before tdc at full throttle. You certainly don't want any more than that and maybe a little less as today's gasolines are slightly lower octane. At any rate though, if the tractor pulls good, fully warmed up, without excessive buildup on spark plugs you might just get manifold in shape and leave carb alone.
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