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

Hi Trevor,

The adjusting the mixture thing is because the carb venturi size is too large, there is not enough suction in hit and miss mode therefore they have to richen the mixture.  To fix this and the 'off governor' speed i remade the carb with and adjustable throttle slide so i could find the sweet spot, was easier than making lots of carbs with different size throats 

Thanks for your support
Ade