I have an old 125 (G4 plastic carb -so not that old lol) on that chassis and it had the height adjuster tied off into one position when I got it. I bought it for parts but managed to get it going by replacing the needle and the fixed height is just right for the front lawn. It does a great job lol and chicks walking by always grin when I use it. Maybe they like the sound.
I just can't bear to break it up yet because it works.

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!