I pulled the fairing and sprocket cover, and yep... the nut and washer were completely missing. I called a few dealerships... a couple of them didn't have the recall kit in stock, so they'd have to order it, and wouldn't sell it to me (required them to install it). The last one I called had the kit in stock, and would sell it to me for ~$8, or install it for free. For $8, it definitely wasn't worth loading my bike into my truck to haul it to the dealership.
The kit with the nut and washer is Yamaha part # 90891-10124.
Now I'd like to verify how to install this, and document it for others. The service manual isn't very detailed on these steps, and the lock washer looks to be different.
First of all, can you verify that the sprocket is the right way? I always read that the text should be facing out, but either this sprocket has no text, or I can't read it through the grime (I tried cleaning, but still didn't see text on either side). I'm almost positive it was previously on with the flat side to toward the engine, but someone else installed this sprocket, so I always like to check others' work.
The nut has one side cupped, and the other that's flat... the cupped side goes toward the engine, right?
The washer goes on with the bent ears facing away from the engine, and the nut over that? When installing, I've read that people recommend using blue loctite on the threads, and the service manual says to torque to 65 ft-lbs. I've also read people recommending to use an impact gun to tighten. I plan to use my impact gun with a 65 ft-lb torque stick, and verify with a torque wrench.
Then you bend the ears down against the nut to keep it from loosening? I assume a small hammer is fine? Here's a pic I found of someone's front sprocket on an FZ6 I believe.
And a picture of the bag for the kit, just because:
Please let me know if this looks/sounds right, or if there's anything I've got wrong. I'd like to get this back together ASAP, but I don't want to screw it up and have to redo it.
DogP