Listen to Jim and Brett.
Widening that port's gonna give you that "feel good" feeling, but likely is just useless work.
Increasing the area of a port is gonna do nothing if you don't have more volume to flow through it. In fact, it will generally make things worse. You kinda want the smallest and tightest port possible to flow what you want at said RPM.
What's the squish without gasket?
Remember the 90/10 rule. 90% of gains are found in 10% of the work, and visa versa.
Unless you have access or are willing to have machine work done to the cylinder, and you can set up and use a degree wheel, just adjust your squish to 15-20. Use some sticky backed sandpaper on your piston crown to sand some out of the band if necessary to achieve your goal.
Advance the timing and muff mod the saw.
If you grind on any port, you'll need at least a small chamfer on the edge of what you ground or you'll chew your piston up. Been there, done that.
Remember that the OEM designed that cylinder through millions of dollars of research. Those ports are already in spots where the best compromise of power/fuel efficiency/durability is. When we play with the ports, we just pick one of these to trade with the other.
Sorry for the long winded response.
