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OK the consensus on air cooled is 20w50, if you don't get stuck in traffic when it's above 80 degrees outside 10w40 gives you better protection when it's cold.
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Some Yamahas only give measurements from the top of the tube down to the oil. There are instructions in the service manual. You can download a free one at
http://www.yamaha-motor-europe.com/community/service/manuals.jsp
Good luck!
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