First thing is to run the engine dry when you are done running them to get all the fuel out of the engine.
Run the tank almost empty then let it idle until it dies.Or just remove the fuel line and let it run out of fuel and empty the tank and lines and rinse the tank and lines with rubbing alcohol.
Try restarting it until it no longer "pops off" with the glow ignitor installed.

Then put some ARO in it and crank it over.
I rarely use ARO, but I do run my engines dry and they always look nice inside after years of storage.