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hey.. my scoot suddenly bogged down ,started back up, and ran fine on idle ,but as soon as i opened the throttle  it died, this happened many times,i drained some petrol into a glass from the carb over flow, and it separated after 5 minuets, petrol should not separate ,petrol should be clear with a hint of green.and no separation, ie different colours top and bottom of sample , if it separates the petrol is crap and scoot will run rough or not at all, while i had the panels off to empty the petrol tank i decided to check the valve clearances they were spot on, but i noticed a loose earth wire on the bolt that secures the valve cover, after draining/flushing tank(with fresh good petrol) refilled tank with good bp petrol and secured earth wire it now 
runs like new, maybe a bit of both caused the problem, hope this helps....ph