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i took the clutch cover off and inspected my primary gear it all looks good checked it more than once it a magnifying glass. no pits or marks on it. So can it be my cam chain tensioner ?

Damn that would throw all kinds of trash in the motor and plug every screen. Then it would lose oil pressure and blow. . I will certainly check. That is serious.

I have a 2019 crf450l. I have 3500 miles on it and i have had this same tick too, it is getting louder now.probably started around 2100miles. So exactly which gears did you change? Do you know what caused it ? Bad heat treating of gear maybe? i would hate to change it and do it again at 5000.