If it works better when you're riding it, leave it alone. The GY6 in any size gets better as the miles pile up.
I just bought a 169cc GY6 and I wasn't impressed when I first got it. Even with only 150 miles it's changed a lot. At first it didn't idle worth a damn when cold. Now it runs much better when cold and pulls stronger with each passing mile. You won't believe the difference after a couple of thousand miles. My 2008 150 purred like a kitten after the first thousand and still got stronger after that.
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2008 Eagle Milano 150- 9,679 miles
2009 Honda Rebel 250- 10,434 miles
2009 CF Moto Fashion- 16,023 miles
2009 MC-114 50cc Cub Clone- 4,317 miles
twowheeler.yolasite.com/
That's 30,049 China Scootin miles and Counting.
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