You probably need to start with the gaskets for the carb. Any air leaks within or between the carb and the cylinder head may cause starting problems. Make sure all internal passageways are clean in the carb. When installing the venturi, make sure that the narrowest part is installed so that it is level with the top of the main main jet. Some can be installed upside down. While holding the upper half of the carb upside down, the bottom of the float should be parallel (or very close) to the gasket surface. Inspect the gasket to make sure that no holes are blocked and there is no damage around any hole. When adjusting the float , it is better to error on the side a larger measurement that to little. Too little can cause flooding problems, too much can be overcome with a little more use of choke.
The need for the spring on the needle and float is determined by the style of needle being used. If the needle has a Viton tip and a groove on the other end it is designed for the spring. The spring allows the float to help pull the needle open if it should stick in the seat. If there is no groove on the float end of the needle then there will be no spring. Even if the needle is designed for a spring it should still work but it may stick closed sometimes.
Unless it contains the main jet, the fuel cutoff solenoid only comes into play when stopping the engine. It is there to keep the engine from running on or dieseling after being shut off. Does your carb have an adjustment screw where the solenoid should be?
Does your 444 have an electric fuel pump? My 2444 does but it may be only on the industrial models. If it has a pump can you hear it run?
When you replaced the coil did you get the correct one? Even though you will not see a resistor on the coil, it is a 6 volt unit. The resistor is the wire from the keyswitch to the "I" terminal on the starter solenoid.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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