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My sister also has a 650 and this is the first time she started it up this year. It idles fine but cuts out when she gives it throttle. I am thinking we need to clean the carbs?
 

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you could try running 4 ounces of seafoam thru the bike in a full tank of new gas

unless the bike will not run at all except at idle.
 

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you can remove the carb bowl covers with the carbs mounted, remove the pilot jets and clean them with a thin wire, you will need to file the point down on a number 2 phillips to get it to fit tightly in the screws, the brass screws are japanese industrial standard or ( JIS ) you need to get that bit to fit tight or the screw head will strip out , once you get a snug fit give it a sharp rap and the screw will spin right out. when you do get the jet out you'll see just how tiny the holes are and understand why they clog up. a grain of salt would block that hole
 
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