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8mm x .8 threads/mm. 16mm total length, with a 1mm thick/15mm wide fender washer. Threaded section of the bolt is 10mm long. Slightly less common in this size as 1 thread/mm is more common for 8mm. If you can't find it and need it in a hurry, you could tap it for a 10mm of the same length and find a fender washer for that. Not sure I'd tap the .8 to 1, may weaken it a little.

edit - also, on my 2013 there is a metal insert in that plastic this bolt goes through like many other plastic body parts. In lieu of buying that again, you might want to increase the width of the fender washer and use some medium loctite.

Thought I'd look it up. The washer that goes into the plastic is Yamaha part #90209-06187-00, and the bolt is #90119-05062-00 (fender washer is on the bolt)

(I wrote the bolt head on this instead of the diameter for future reference... The correct size is M5x.8x16 with a fender washer on it)
 

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Isn't that a swingarm grease fitting that you're looking at?
No... it's the bolt that holds the "seal guard" (yamaha term). We all call it the chain rail. It's the plastic piece the chain rides on over the top of the swingarm. The zerk fittings for grease are on the top of the swing arm on each side.
 

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Personally not a fan of how Yamaha did this part. Many other bikes you don't need to remove the swing arm just to replace this, they are made to allow you to bend it around the front of the swing arm and bolt through two holes in a tab on top and bottom that line up in the same spot. Also noticed when you switch to an O-ring chain, this plastic guard is just a bit narrow and there's no alternatives available for a wider guard out there. Inside edge of the chain rides the edge of this guard on mine with an o-ring chain.
 

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Discussion Starter #10
8mm x .8 threads/mm. 16mm total length, with a 1mm thick/15mm wide fender washer. Threaded section of the bolt is 10mm long. Slightly less common in this size as 1 thread/mm is more common for 8mm. If you can't find it and need it in a hurry, you could tap it for a 10mm of the same length and find a fender washer for that. Not sure I'd tap the .8 to 1, may weaken it a little.

edit - also, on my 2013 there is a metal insert in that plastic this bolt goes through like many other plastic body parts. In lieu of buying that again, you might want to increase the width of the fender washer and use some medium loctite.

Thought I'd look it up. The washer that goes into the plastic is Yamaha part #90209-06187-00, and the bolt is #90119-05062-00 (fender washer is on the bolt)

So would the bolt be a M8x.8x16? Correct
 

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Discussion Starter #12
Learn from my lesson...I have had a busy month and put off this repair. Returning from a hundred mile ride, 500 yards from home I heard a loud noise, and the engine stopped and the bike just rolled. The chain seal came off and got stuck in the front sprocket and un-did the chain. Fortunately it was easy to put the chain back on, pull the old seal out and baby her home. Now $60 worth of parts and $40 of shipping to Alaska, I need to take off the swing arm and replace the seal, all because I was too lazy... I ordered two bolts and will keep one under my seat.
 
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