The 4-mix is a 4 stroke, NOT a two strokei that uses mix for lubrication.
It’s a four stroke engine with valves that uses mix for lube. It’s a fun concept that works really well and if you adjust valves or have them adjusted every 200 hours or so they last a long time and run well. In a commercial application, I adjust them every winter shutdown. For a residential application the machines are replaced because of age before they need the valves adjusted.
Just like M-Tronic, this has been out a while and it’s proven itself, people are just afraid of change.