You should lean the high speed needle to max RPM, then turn it counter clockwise an 1/8 of a turn. Then adj. the low speed for good transition from low to high. Also moki's like to be started wet when cold. So, choke it by putting your finger over the carb before trying to start it. Your finger should feel wet. Be careful that's a powerful engine. I have 3 2.10 moki's and they all needed a perry pump and a glow driver to operate properly.

Good Luck

Steve