Welcome 2mariners, when I started working on my GY6 I had no clue what I was doing, and found it was a lot of help to read the manuals front to back. What the parts were, what the specs were, etc. I just googled honda MT250 and found this link
http://www.honda-elsinore.com/ and if you look at the top there is a link to manuals. Found yours, it even has "principals of operation", good write up.