It’s pretty common practice to measure the compression ratio, in a two cycle, above the exhaust port.
I’m pretty sure you could get away with just nine CC’s in the head. The head is probably already cut to get to 11 CC’s so if it was me, I would cut the top of the barrel to lower the head CC’s to 9.
The ideal fuel/air mixture ratio for alky is about twice what you would run with gas. Alky 6 to 1, gas 14 to 1. And you don't want to just drilled the holes twice as big in diameter. You want to increase the area of the hole by two. Do the math. Pi R squared.
Some of the other suggestions would work too, this is just another way.
Comments compliments criticisms and questions always welcome.
Comments, compliments, criticisms and questions always welcome.
If the data does not support the theory, get a new theory.