Engine tap after oil change 09 yz450

I had just changed my oil with Castrol 10W40 synthetic, This is the bikes 3rd oil change which the dealer has changed it before. They told me to use any Motocycle approved 10W40. After the oil change at about 1 hour of riding I started to hear a tap ( kinda like a valve/lifter, etc in a car ), the valves were checked by the dealer in December when I bought it. I have been told that the best oil to use is rotella 15W40. Could this be a oil issue or possible internal like a chain tensionor or valve clearance. also I have only put about 10 hours on it since bought. Thanks

It's probably just the same old YZ450 issue; they're noisy, and make no pretense or effort to be otherwise.

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