There is a minor bracket / brace that should attach to the rear engine mount shaft. But if not attached, it will hang down onto the chain, just above the swingarm pivot, and make a clicking sound as the chain rubs against it. I know from experience

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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30