Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Have you checked to see if you are getting spark to the plug?
The 1 1/4 turns would be an initial setting turning the screws out that distance from all the way in snug. I doubt that it would be an ignition coil problem on this one since you say it has good spark. The problem I have is that you say it won't even fire or try to start on carburetor cleaner or starting fluid when sprayed directly into the carburetor. It should at least hit or fire like it wants to run when you do this. I would be checking for an air leak on one of the crankshaft seals or cylinder base gasket.