I would agree with Ed I have owned and operated at least a couple dozen differant 4 strokes and all ran very reliably once tuned properly and broke in. Idol can sometimes be slightly high when an engine is new . People come to forums to find help with problems , that dosen't mean it is a design flaw or low tech. problem, most problems with any engine happen because of a problem with set up somewhere . I am sure 4 stroke technology could always be improved but do we really need to, YS has probibly got the most complicated 4 stroke system , Obviously the others don't consider it to be something they wish to get into at this time.