With any luck, both of you will find final solution with this.
Note that even after petcock repair, its possible further tuning on synch and pilot screws may be called for to nail it down.
I recently "woke up" a neighbors '07 250 (bike sat for years) with a similar wandering idle....simple fine tuning of the carbs (after assuring the circuits were clear and doing careful setup) was the final solution. In this instance NOT petcock related.
Can be frustrating but we've got to eliminate possibilities one by one, especially via keyboard. Difficult not "being there".
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