That starter draws almost 200 amps. It takes a well charged heavy duty (Marine) battery with good connections to do the job. You need a 12 volt starter solenoid, a lesser switch would burn up. If the battery is weak, pull the starter rope. It takes 20% less effort when the compression relief valves kick in. If you can’t get the wiring harness, A solenoid may be mounted inside the motor cover and activated by a push button switch on the front. It should be wired so it only works when the motor is in neutral. . . 😉
