This article will explain the lever height setting on the WH8 carb which is independent of which motor you use it on. https://www.southwestairsports.com/ppgtechinfo/top80/hrservicenotes/walbrowg8/ml_height-variations.htm
Note that the Moster uses a different carb.
The WG8 has no High mixture adjustment screw.
Instead, it has a High Jet.
These are used on most small engines up to approx 130cc.
The bigger engines typically use the WB32 or WB27 which has a High mixture adjusting screw.