Ok ty for the info , i will try to find a video of one being done , so i can have something to go off of , after its done , id imagine id have to retune the carb? Alittle more on the H screw?
Every saw needs to be tuned in the cut after any modification is done to them to be correct. Setting them with a tach is only close to correct on a stock saw. Once a saw engine is worked on/modified then the carb must be re tuned, I don`t agree that a carb must be richened up after porting or muffler modification, just from my own experience this does not hold true.