ORIGINAL: Allfat
To use the tachometer to tune your engine, you put the tach on the prop while leaning out the needle until it peaks. Read that peak rpm off of the tach. Then re-tune the needle until the rpm is about 500 rpm below that peak value. Then you are good to go flying.
Hello, sorry, some clarifications:
1. what do u mean by "peak"
2. what is "line out", close the main needle or open it some clicks???? Before this term, I just knew "lean in" (close the needle) and "rich out" (open the needle)...
Thanks!