My saw is cutting like a monster. I need to either do the 620 carb or plug the hole in the high jet and do the 620 coil but I am very happy so far. I'll] look into some of the things you mentioned next time I open the saw up.
Ported my first saw today. Echo 590. Smoothed the airflow to the secondary lower transfer (dident do the primary because i was nervous about too much case volume causing spitback). Base gasket delete. raised and widened the exhaust.
Final numbers
Intake close 76
Intake open 80
EX 105
TRANSFERS...
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