Chainsaw Repair

I was shown abit different way to do crankcase volume mainly so it works with my TSR program , the way I was shown a 3120 ends up at 1.47 to 1 ratio , You want 1.20  to 1 ratio . That much changes will produce alot more power but takes about double the fuel to produce it and to get the 1.20 ratio your pretty much outside the case so alot of extra machine work , If you got the time the best thing is to machine a new crankcase so you can make more volume and 2 carbs on it to get enough fuel to make it run