Please read the quote carefully...
It does not say...."A Victa 125cc engine will not change its horsepower at a specific rpm, governed or ungoverned"
The early 125 3.6hp engine does not fall under the specs of your graph!
Its not bound by the same rpm limit of 3,500 aprox rpm in your graph example. It is ungoverned and has a 7,000 rpm limit, twice that of the 125 in your graph specs.
This higher rev limit will increase hp levels higher than those quoted in your graph and very similar to that which is quoted in the Amplion/unknown mower ad, making these claims fairly accurate.
As I said, your graph has no relevance to the HP rating of the victa engine fitted to the mower in the ad or of any earlier Victa 125cc engine!
Whats in your graph and What Victa did on later engines is debatable as Puffery and your opinion,but it doesnt apply to the earlier ungoverned engines which run at much higher rpm than 3,500 and will by law of power,naturally produce more HP...
