piped ported

I've decided to part with my ported 272xp. She's a good one. Nice strong ported saw. All oem. Piston and cylinder are like new. Exhaust set at 98 atdc 152ish intake duration. I did not cut the base. Saw has a nice loud duel port strait pipe! I compleatly tore the saw down and cleaned everything...

Hello Everybody. Recently, i have received a Zenoah chinese saw, 52 cc, that for cleaning my garden and make some firewood it 's ok. But, im interested to gave some extra power, and make some modification: 4 mm raised discharge port, and 2 mm lowered intake port, that give a little more power...