Honda 2000: surprisingly poor oil fill tube design

My Champion is the same way, must be an inherent design (flaw) with the smaller units, that or all the engines are from the same manufacturer....lol

Not an issue with me at all. I just tip the genny and fill it. The capacity is clearly marked in the owners manual and with no filter to worry about, I just add the recommended dose, screw on the cap and call it good until next change.