It only takes a tiny piece of rust or trash to hold the needle off the seat. Might take a fuel sample from the line at the carb. Drain some gas in a clean glass and see what you catch. If it's dirty, the tank is contaminated and will need to be removed and rinsed out. Be sure the sediment bowl screen is in place. Some add an inline filter, I personally don't like them, they can be too restrictive for gravity flow systems. Once everything is clean and back to factory design it should be fine.If you can get E85 gas, it makes a good cleaner to rinse out the tank.
Those carbs are simple, designed to be field serviceable. Just be sure to work over a large uncluttered area in case something is dropped. I would start with just trying to ease it apart and look everything over. It may go back with just a good cleaning and adjusting. If you need a float, or a needle and seat, just buy what you need. There are kits that are called "comprehensive kits". They have everything available for a complete rebuild. Unless you have excess wear in the throttle shaft, I would not go that route. Trying to replace all the parts is difficult and often unnecessary. Just do what is needed, keep it simple.
You can find carb specs and adjustment procedures online with a little research. Or invest in a shop manual. You will eventually need it, especially if you get into the governor adjustment.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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