Help! 99 Suzuki vz800 making clicking sound!

Sounds very suspicious, might be a cam chain or even the tappets needing adjusting but if I were you I'd try to get it to a proper local suzuki mechanic asap!

Somewhat of an update....

So I took my bike to a mechanic and let him listen to the sound, he said it sounds like a loose valve noise which gave me a little hope. He said the bike would not start and run so easy if it was a loose cam chain...

My first attempt at adjusting the tappets did not go so great. I had never done one before so I took my time. Getting the feeler gauges in there was the hardest part. After I put everything back together I realized I set them wrong. I did have the engine set to TDC like your supposed to,  but  I didn't  realize till after that the exhaust tappet clearance was different than the intake. Heres how it sounded: https://www.youtube.com/watch?v=mPSgJkS2qjA


My second attempt went much smoother...sort of. This time I set them using the method where you turn each screw out a calculated amount. It was much easier and quicker than using the feeler gauges. Im pretty sure I set them right this time but the noise is still there. heres how it sounds now: https://www.youtube.com/watch?v=JGsV1tuLYv8


The last thing I did was check the front cam chain to see if it was loose. I removed only the front cylinder head cover, which is where the noise is coming from,  and messed with the chain to see if it was loose but it felt pretty good. Here's a few videos: https://www.youtube.com/watch?v=94AJE-xFe_8
https://www.youtube.com/watch?v=27TW8ijGN-s


So now im stumped! Assuming I set the valve tappets right and the cam chain is fine, what else could it be? I know these bikes are known to be noisy but this is pretty bad. Could it be that it needs better oil? Also I still haven't figured out the over heating issue which im assuming caused the clicking noise to begin with. I think I already mentioned it but the previous owner said it would overheat and the engine would cut off. Im assuming there is something wrong with the radiator? How do you know if it working properly? 

Before I pay a mechanic to actually look at instead of just listening, ill probably try changing the oil(which looks decent as is) and coolant and see if anything changes. Not really sure what else I can do besides letting a pro look at but I hate to spend money when I can do the work myself! If it ends up being something serious it might be cheaper to just get a new engine? Ive seen a few for under 700 which doesn't seem too bad!


as always any help is always appreciated!