RE: glow 4 stroke versus gas
The OPs question was between a OS .91 pumper or gas. A two stroke is much easier but wasn't put down as a choice. I do wonder what the difference is between tuning a four stroke pumper is compared to any other glow engine. I have seen that stated before and a pumper is the easiest of all glow engines to set up and tune. Other then valves that need adjusting every year or two what is the difference?? A high end needle and a low end needle. The fuel tank is vented instead of requiring a pressure line to the tank.
An inquiring mind wants to know??