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The "auto restrictor" (I'm guessing you mean auto-enricher) ONLY impacts the first ~2-3 minutes of runtime. When you first start it and its cold, it delivers an initial slug of extra fuel, and then a constant smaller additional dose of fuel, until the needle closes fully, at which point the carburetor is running at where the engine should be when its warm.
It would only ever cause starting problems if it were somehow physically broken and not withdrawing the needle from the circuit when it gets cold. If the engine dies after running well for a few minutes, it would be something that I would check into, but not if you aren't able to start it to begin with.
So lets start with the basics. SPARK, FUEL, AIR.
1. Have you verified that a spark is present? (Take out the plug, install it in the boot, and using the boot, press it up against the engine block and turn it over; it is immediately obvious whether or not you have a spark).
2. Have you tried taking out the spark plug, spraying some starter fluid inside the cylinder, putting the plug back in and starting it? If it actually tries to start instead of just turn over, its a safe bet that your problem is with fuel delivery and you have a carburetor or gas tank/pump issue.
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