The valve is open when the lever and valve are parallel. Generally that is down. When the lever is pointing across the valve it is closed. Think T vs. I. If the lever and valve cross it's closed, if they go the same way it's open.
That applies to a two position valve, if your Bayou has a reserve postion it could be different. That would be three positions and across one way would be open, down would be reserve, and across the other way would be closed. Should be marked on the petcock if that is the case.
ON = Vertical. The fuel petcock may also have a "reserve" position. If it does, then when you run out of gas riding down the road all you need to do is reach down and flip the petcock lever to the reserve position. This lets the last 1/2 gallon of gas in the tank to be used. Most petcocks have a "bowl" with a 10 milimeter bolt head on the bottom. This is actually a basin that catches a bit of trash and any water that gets into the gas.
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Turn the lever to the "off" position then remove the bowl and look to see if any water or trash is at the bottom. Since water is heavier than gas that is where the water will collect.While the bowl is off, momentarily turn the lever all the way past vertical to the other horizontal direction. If fuel still comes out after passing vertical then you do indeed have a fuel reserve.
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