2nd ATV (new sound) – HELP ME OUT — TRX200 “91”

Fixed the first one –

Was coughing through carb , here..

https://vimeo.com/145080774

Adjusted chain tensioner, set valves, cleaned carb,
Got it purring, here..

https://vimeo.com/146667509

Now— just brought this one home from the ranch..
It has been up there for 4-5 yrs and has been a freakin workhorse.
BEST ATV I have ever had.
Only had to change the Chain twice on it.
All fluids and everything always changed out..

Now- this one has a louder ticking-kicking sound
in the CRANKCASE/GEARBOX area.

So , I brought it home, cleaned carb, set chain tensioner, adjusted valves to rules all that stuff out.

But still have the sound….
Any ideas ?? Here is the sound it is making :

https://vimeo.com/146667423

It still runs great- but I know there is an issue down there..

Thanks guys —