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Do you have a volt meter to test the voltage at the battery cable connections on the engine when cranking? What is happening is you are loosing voltage or the start solenoid is bad.
Could I get the engine model number please?
Later today is fine. Just post back when you are ready or have done the tests. You want to check the voltage on the battery cable connection on the start solenoid with key in crank position. Do the same test on the negative battery cable. This will eliminate possible voltage loss.
Post back with findings and questions.