needle

I have a 48cc bike berry bbr tuning motor with the speed carb: https://www.bikeberry.com/engine-kit-parts/performance/2-stroke-speed-carburetor.html I live in Spencer, WV where the elevation is at 748 feet above sea level. I would like to know what is the recomended setting for the needle? The...

I recently removed a needle from a friend's speed carb and found his needle's e-clip has ground smooth the notches.