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The petcock on my 2009 only has three settings. On, Prime, and Reserve. Does your petcock have a vacuum tube on the back of it going to the carburetor? Mine does not allow fuel to flow to the carburetor in the On and Reserve settings unless the carburetor is asking for fuel. If it is set to Prime, then fuel will flow to the carburetor whether the engine is running or not. This setting should only be used if the bike has been sitting for a while when starting and then turned to On once the bike has started.
Being an older bike, I am assuming that your petcock is not vacuum actuated, but I am unclear about that. Perhaps someone with a bike closer in manufacturing date can chime in on that.
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