I posted this on the backside of Robtharlson's warning about needing to lockwire (safetywire) the chain adjusters on the 919, but I had a slightly different problem. Not getting a response there, I figured nobody saw it, since there's always a reply to everything...
Anyway, here's what I posted: copied and pasted, so sorry if it is a little non sequitur.
Sorry to dredge up an old thread here, but I've noticed over time with my 919 the chain continues to be a real hassle for me. The right (as viewed from the rear) adjuster is CONSTANTLY coming loose, for example: when I "preflight" my bike I touch everything, all nuts and bolts I can see, chain slack, lights etc... But as I said the right side adjuster is constantly coming loose. This makes people often ask me why I'm adjusting my chain so often, and then they go on to tell me they've got 10 bagillion miles on their chain and it's still in spec, and I shouldn't have to adjust my chain so often, etc...
Anyway, I've gone over every "chain lube and adjust" thread I can find to read, and I have come to the conclusion I'm doing something wrong. Rob says the left one should be the one to "self" adjust, and it very well may be... but if I'm noticing the right one being loose, how could the left one "tighten up?"
To cut to some sort of chase here, is there a thread on how to tighten the chain specific to the 919? I have to be doing something wrong, I've tried measuring right and left side to make it even, I even tried a "string" theory that didn't work out well. My other problem is when I think I've finally gotten the chain perfectly adjusted (meaning proper tension and sprocket in the center), the tire is clearly not aligned. When I get the tire and chain perfect, the sprocket isn't aligned. I've started just trying to "split the difference" on all these things. It's been working, but today I just couldn't take it anymore... What am I doing wrong?
Step one: loosen axle nut
step two: loosen chain by adjusting both adjusters (at first I just tightened them the same amount, but this didn't always work, I believe because of the self adjusting adjuster)
step three: tighten chain to speck
step four: verify tire/chain/sprocket alignment (this is where I can spend literally hours)
step five: tighten axle nut to proper torque
step six: re-verify everything, then check chain slack on side stand
I think I need help in the step three and four zone... If anyone has any good ideas and/or a visual how to I would love to know. Thanks.