I decided to pull out this Victa Corvette that I have never mowed the lawn with since I got it three years ago.
Apart from a slightly noisy exhaust, it makes this noticeable squeaky noise as it runs. So noticeable I put on a pair of ear muffs as it got annoying.
I have two other full crank 160s that do the same thing but not as pronounced as this.

Does anyone know what it indicates?

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