The spare parts shows a spring 91 maybe you need to push down the knob first before turning to engage the link so it turns.

93 is a pin so that could be broken and if so it would need replacing.

This video shows a few adjustments.



Parts manual shows all the bolts to remove.

https://www.outdoorking-forum.com.a...ame/victa_imperial_chassis_4-strokes.pdf

Cheers
Max.

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