172 Needs choke to run

I have to pull the choke out for the tractor motor to run. My neighbor says I need spark llugs. It pops a little bit too. What should i do? I moved the distributor until the timing was evening out the motor. But i still need to have almost full choke.
 
If your engine is in good condition and this issue came up suddenly, then it is most likely a Fuel Flow problem.

Open the drain on the bottom of your carburetor and see that you have a decent flow of gas from your tank through the sediment bowl.

If so, you have a restriction in the carburetor itself and you will have to disassemble it and clean it out.
 

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