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Re: BMW f650 funduro oil sump plug rotates but won't come...
The threads are bad. If you cannot get under the head of the plug or use vice grips to pull it out, then you are going to have to remove the whole sump pan.
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It sounds like a plugged vent on the fuel tank. There is a safety valve on top of the tank that should allow air in to fill the space where the gas was. A malfunctioning valve would cause the problem you describe. First, make sure the vent tube is not full of mud. If a vacuum is forming in the tank you should hear a hissing when opening the fuel tank. Opening the fuel cap when the filter is half full, and the bike is running, should allow the filter to fill up normally. If the the one way valve/vent on top of the tank is bad replace it with a new one(about $25). Another possibility would be a fuel pump malfunction. Open the fuel cap , unplug the lines going to the carburetors, place them into a cup, turn the cycle on, and see if the pump is pushing the fuel properly. If the fuel pump is bad it will run around $360.
to change the oil you need to remove the sump plug, located on the underside of the sump. the plug is a bolt on the botom of the engine. once the bolt is removd, oil will drain out rapidly so have a container ready to catch the oil.once drained put the sump plug back in and refil with new oil.
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