Just a thought here....I was looking at the C50 specs...and on the 2006-2008 fuel capacity is listed as 4.1 gallons. On a few bike models, fuel capacity is a little less for a "california legal" bike due to a little bit of emissions equipment in the tank. Is it possible that your bike was originally a calfornia model and holds a little less fuel than the rest of them?
I dunno...just a thought.
One more thought....maybe you are getting vapor lock....next time it starts sputtering and you think you need gas, stop on your way to get gas, remove the fuel cap and then put it back on....see if the problem goes away.
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