2006 Yamaha Roadliner (1,900cc a/c V-twin)
Final Drive (No clutch, just chain/gears)
So I'm always a stickler on PM but totally dropped the ball on the final drive... It only holds ~2/3 quart and should be some kind of 80w-90. Manual says inspect / change @ ~ 3-4 years / 3-4k miles. It's a PITA because you have to half take off the exhaust.
Below is what came out. This sample is ~9 yrs old w/ 9,800 miles. (Factory fill was changed by the dealer ~9 years at 600 miles). It looked pretty nasty, but all well used gear oil does IIRC. Below does not look too bad to me, I was expecting worse.
Refilled with Motul Gear-300 75w-90 (Won't be going another 9 yrs though)