It is only when hot and only at idle or very low revs. It has electronic injection. The coolant and oil are at the right level. It is more like a squeak than a whistle. Don't think anything is loose on the outside, so it comes from inside the engine. Did not notice anything wrong in the behaviour. Does anyone have an idea what or if anything is wrong?
Same model as malaguti xtm or aprilia sx and rx.

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