Since the motor does fire using the starting fluid you do have spark, and the motor will run with the proper fuel and carburation.
What I would like for you to do is first change the fuel. Yes I know you added stabiliser bla bla bla. Please humor me and do this. Dont forget to drain the float bowl also.
Although you have added stabiliser it doesnt mean that the fuel is not bad. Personally I think buying fuel stabiliser is a waste of good money. Not to mention a fast trip to a headache.
If it will still not start then the problem is going to be in the carburator. I think you will agree that changeing the fuel is easier and cheaper than rebuilding the carb. So lets start with that and we can go from there.
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