Small Engine Troubleshooting Problems? Ask a Mechanic Now.
GT275 has only the coil to make the spark. I think you need a new coil!
Did you get it going? Have been on the honey do list. If it won't start, try putting fuel direct into the spark plug hole.
If it fires, does the carburetor have electric solenoid in it?
If it has compression, check the valves,
Safety switch will not do this.
Just because it has compression does not mean the valves are working!
I assume you tried another plug!
So it will not start at the moment! And the solenoid in carburetor is opening?
So solenoid is dead! Remove it and cut the inner tip off,,re-install as a dummy.