Absolutely as to daily tuning & the cause an effect issue . I set my low speed to ensure crisp response , then tune the high speed within the cut to allow maximum rpm & back it off a quarter turn or so . The idle speed once warmed up to just before clutch engagement , this usually provides sufficient rpm for a cold idle start up !LOL.. I used to run a lot of Nitro powered RC toys.. Yup!! had to re-tune when it got hotter in the afternoon. Hot air has a lot less density. Not sure if an RC carb is the same a saw carb.. RC carb? When you change the main jet, it effects the low jet.. Is that the same on a saw? Never seen that discussed??