I have read through this a couple times and sorry if I am not understanding correctly but I want to dremel a rectangle basically 5/8" x 1" that is 1/4" from the bottom of the piston centered on the intake.While in comparison a hole would be easier, but what is fifteen minutes with a dremel? You want maximum port timing with reed valves, or so I have read because I am not an expert what-so-ever. A rectangle would optimize your port timing so you can get the maximum amount of fuel and air mix in there. Something like this
Nothing needs to be exact on this and doing this mod will not negatively affect the running of the engine? I did want to do the simple cleaning out of the flash around the ports so this can be done then as well.
After I am done with that I should do the spark plug test for correct jetting of the carb? Thanks for all the good info I am just hesitant on doing too much on internal mods without understanding the full spectrum of what I am doing.
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