My ZG327 has developed a ticking sound. Is it possible the valves just need adjusting or is it something worse? It’s a 2007 model with 450 hours. I recently changed the oil and that the advice of the Dealer I used to 10W-30. I had been using 10W-40. The oil level is fine. The ticking sound is slightly worse with the new oil. Link is to a short video with the ticking sound. I wouldn’t really appreciate any insight any experts might have.