Chainsaw Repair

Ok I started plugging in some numbers on the BMEP choices and input values to get the ball rolling. If all goes well you say to rerun the spread sheat after all the numbers for the every sheet to get target numbers. What do you mean by that. I guess what I'm saying is after I get all the numbers plugged in where are the numbers I need to use to get the desired results? Maybe I'm not seeing it. Also what are the intake port 1 and intake port 2 for? Same goes for exhaust and transfer ports too. It might take me a while but I and determined to put this program from step one to final result. One thing that I think might help is a spread sheet that is maybe already done as a example.  I'm sure I will have more questions.