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Horrible top end sputter...

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GASGAS EC300 2006

Since I've had the bike it has had a bit of a top end burble, which eventually cleared out, but now I have this. What do you reckon it is? I have changed the secondary ignition coil, new plug, ht cap etc, the carb is clean and float is correct, the bike runs just as strong as ever (even at full throttle), but right after the power valve opens it coughs and sputters and never clears out, any ideas?

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