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an old thread, so its probly sorted. But i had a similar thing with dads aprillia 500 scooter.The problem was it running way too rich - caused by automatic choke staying on due to temp sensor not set up for cold places.Taping up the oil rad was a temp fix, but replacement of the sensor was the permanent fix.
With that in mind, and your misfire, did you check the choke mechanism?
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