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

Only things that stand out here are I’d want to see the plug fire while grounded against a head bolt, or similar, simulating when installed.  The other is as I suspected, a very sensitive carb designed to run more or less level with the fuel level, with very little vacuum pulling the fuel.  The risk with these is they flood or starve too easily when starting.  I’ve owned bikes that wouldn’t start unless choked and kicked exactly once, then unchoked and kicked again.  Any deviation was too little or too much. Unlike glow fuel, wetter ain’t always better.