Well, it's NEVER a bad idea to reset the chain tensioner and double check the valve lash......Now, other may disagree, but I have always found the 185/200cc Honda engines to be a little "noisy".
The 200E I just finished is strong and smooth but ticks like a clock and the tranny gears whine. I think it's just the character of the engine.
My advice to you, follow the Honda manual for setting the valves and chain tensioner. Adjust the clutches. Double check the pulse generator gap. Put a new plug in and check the timing. Change the oil with a quality ATV oil made for wet clutches and the run the F out of it like it was made for.
If you feel power is lacking a quick compression test will tell you much.
I was born and raised on Venus & I may be here a while.....