Check the simple stuff first- SPARK- FUEL-COMPRESSION- If you have all three - it will start.
Check for a torn/popped carburetor diaphragm, Propane coupler faulty ( Quad ring stuck in there). *** on the vacuum lock off line and see if any fuel comes out of the carburetor
Make sure your firing order is correct ( Spark plug closest to fan is #1) Check timing marks
You have compression it should attempt to start or run rough
Hope this helps
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