I think Yamaha is making a mistake by listing it at 31 Ft-Lbs. 31 is the general spec for a 17mm bolt in the yamaha manual. A drain plug really isn't in the same league as a 17mm that actually holds something together. most GSXR's for example have the same size drain plug and the torque rating is around 15 Ft-Lbs. 31 is just to high for aluminum threads that get torqued that often.
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And so castles made of sand fall in the sea, eventually
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