I just yesterday put in a new spark plug in the GT300i, as I have put over 5,500 miles on it.
My consternation with the whole process was getting the blasted plastics off! I have the service manual, and the only thing it said was to remove the seat, met-in cover, and the front cover. No picture or illustration at all. There was a photo of the spark plug, but where it was taken is beyond me.
After three attempts, I snapped off two of the hold-down bolts (it was my fault, as I tightened them too much) on the met-in piece putting it back on without ever figuring out how to remove the front cover.
I thought an illustration showing parts assembly showed a "hook" and slot arrangement holding the front cover in place...well, after three try's I discovered it was held in place by, basically, friction fit! At least I got the piece off and after discovering the spark plug location it was simple, except for drilling out the two met-in bolts and epoxying new ones in place so I could add some new acorn nuts.
Now all I have to do is remember how I did the removal 'tii the next spark plug is needed in 6,000 miles.
I think Kymco could add some better instructions on plastics removal...I also have a Yamaha Morphous and the Owners Manual has really neat drawings about taking ALL the panels off .