Intake/Scavenge/Exhaust porting

Bobby Dopefiend /

I've read the 2 stroke tuners guide... twice... and I get it but I don't. I understand the basics of what he's saying but he fancied up something that didn't need to be Either way, lots of useful information. I was wondering how closely you guys(Specifically for you hobbit guys) calculate out your timings. DO you calculate all things in that book? Do you sit down and do the math? Do you just open things up a bit? do you measure down to the .0001?

I've practiced with my dremel, however I am nervous to do this to my brand new polini. What would you say are the most important thigns before digging into a project like this

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