There is no base setting for the carb when changing to a non standard cylinder, so as not to over rev the engine the key is to check the max rpm with a tachometer, 13000 should be the maximum you should set it too, the two screws are fuel screws so unscrew to richen the mixture and decrease the speed, I would start with settings at L 1 1/4 turns out and the H 1 1/4 turns out, you will need to fine adjust from here.
Answers & Comments
There is no base setting for the carb when changing to a non standard cylinder, so as not to over rev the engine the key is to check the max rpm with a tachometer, 13000 should be the maximum you should set it too, the two screws are fuel screws so unscrew to richen the mixture and decrease the speed, I would start with settings at L 1 1/4 turns out and the H 1 1/4 turns out, you will need to fine adjust from here.