how much hp are those Victa motors putting out? are they horizontal shaft?
Victa made millions of 2 stroke engines that almost look identical in 125 and 160cc. They were vertically mounted for the mowers, but are easily turner onto there side buy just spinning the carby. I have a few different manuals and will look for claimed h.p. They are very small and simply made, but have a bit of a strange port setup. I know from experience they love a bit of extra compression by shaving the head. When i get a bit of time later a will scan a picture.