Old rubber mounts (change them at 5 years) can certainly cause vibration (and cracked engine frames if let go), but I would think he would have it many places within the throttle range and not just in a certain rpm in deceleration when the prop unloads.
But it absolutely won't hurt to check and be sure.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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