On a stock Honda? You may be losing power running that over something like the VP 98 – unless the combustion chamber is setup to run that kinda fuel, it can be detrimental to performance.
Part numbers on the piston. Have a look at the cylinder to see if its been ported. Check the squish. I’m not really familiar with the Hondas, but that’s generally how i’d check any 2-stroke to see if it’s been worked over.