Believe it or not! A 12 mm generic washer is not the same as a 12 mm Honda crush washer.
I'm a newbie doing my first oil change. Before you say anything about my having removed the wrong drain bolt -- which I did not-- I can tell you that the generic washer my dealer sold me did not fit my drain bolt. Had to return to dealer to exchange for a Honda part. Also, my drain plug DID not have a washer on it to begin with.
Other comments: like somebody you have said, my dealer also does not carry 10w-30 gn4 mineral-based cycle oil, despite the fact that their parts' counter has a Honda list of recommended motorcycle oils which calls for the use of 10w-30 on all cycles MY 2007 or newer.
One more comment: while removing my under fairing, I noticed that one of the bolts on the left side was not a standard bolt with hex opening for removal w Allen wrench-- just a standard hex head bolt.
Assembly shortcuts, or engineering design changes not showing up in service manual?
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