ORIGINAL: alan0899
G'day Mate,
Sounds lean, be aware, early in the morning, the air is cooler & so it is more dense, so the motor can be run slightly leaner, as the day warms up, your mixture may need to be richened, a couple of clicks, to allow for the air becoming less dense.
Do you have an explanation for this? Full size aircraft have to lean the mixture in less dense air, so it seems intuitive that when model engines encounter cold dense air we need more (not leaner) fuel to mix with the extra air. Is the model carb. different in the way it sucks fuel when the air is dense?