Just a couple notes on adjusting the fuel mixture.
First the low and high do interact. So it is to get the idle mixture right first. IF were an Echo trimmer I could provide basic procedure but you must have a tachometer. It is that you tune to best speed and then enrich to slow down some. Then you peak the high and then enrich for a 100-150 drop. From there you fine tune for throttle response.
Second the metering lever should be set at the correct height or you have over rich or lean out. Similar a stiffen metering diaphragm can cause problems. This why I have three different metering lever tools for Walbro [2] and Zama [1]. Many of the Ruixing carburetors uses one of the three depending on which carburetor it is a clone of.
Basically this interaction is the same for all carbs as the idle mixture feeds all the time.
