The hi mix needle valve (bottom of carb), open 1- 1.5 turn. The low mix needle in center of throttle arm, .5 - 1 turn. --> This is setting for methanol as fuel, but of my experience if use gasoline/petrol, the setting of fuel needle is much smaller than the setting for methanol due the gasoline/petrol has high value of enegry than methanol.
See at the movie of my engine : The engine is easy to start up when the fuel amount is set to a bit rich from closed main needle to opened up to 1/4. Then adjust to lean until engine is running without rough. From closed fuel main needle is opened up to 1/8 turns, not much petrol/gasoline to run engine, also the fuel has much energy than methanol.