That was the first thing I did when I got my Gy6. Port matching and porting the head are free ways to increase power. I also swirl polished the valves as well as back cut them for better flow. All hot rod tricks we use when building race engines.
Its important to remember to have a free flowing exhaust to take the advantage of the extra flow. Having a larger exhaust pipe vs the exhaust port opening helps to prevent reversion of the exhaust gases.
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If the only tool you have is a hammer,
Then all your problems look like nails.
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