Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I recommend against WD-40 in your fuel. It is not a good lubricant.
A synthetic 2 cycle oil or Marvel Mystery Oil is a better choice. I prefer the Mystery oil. 
15 to 1 is a good ratio. For fuel I use Coleman or Crown camping fuel (white gas- naphtha). I also use pure fuels like ethanol free fuels sold for yard tools and I like 100 octane Low Lead aircraft fuel. It vaporizes nicely and lasts for years on the shelf. I would not put any regular car gasoline in any of my engines. It is nasty in many ways. It has a multitude of poisons designed to be pushed through a catalytic converter at 1400-1800 degrees. Your ET1 won't get much over 110 degrees and won't need water for cooling unless you make it work hard for an extended period. It also has ethanol which will help your fuel destroy most any fuel system you leave it in.


If your ET1 has 2 piston rings, I suggest removing the lower one. Your engine will run cooler and use less fuel.


Most of all...... have fun...!!!


Gil