I HAVE PM'd LDH so im waiting to hear back from him on the subject. But i figured id ask the rest of the commuity what they thought and maybe some links to other deals / kits, Im not afraid to spend a little more if necessary.
I got that same setup. I upgraded to the did chain rated for 1300 cc. No adjustment in 6k miles.
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"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
-2005 CBR 600 F4i
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I'm very happy with my 17/44 from LDH, went with the superlite steel in the back. Another option would be SuperSprox, if you buy the counter, sprocket, and sealed (did or rk)chain they guarantee the sprocket for life.
I'd never go back to 530 from 520.
For max mileage I'd go steel rear instead of aluminum.
I have found the AFAMs and the DID to be excellent.
I think an o ring chain is more robust re long term seal integrity than x ring chain.
For longevity, I'd stay with 530 simply because the sprockets and chain rollers have more surface area to distribute the load. All quality chains use some letter of the alphabet to signify the unique shape of their proprietary o-ring. All good. All hold the grease in. The key is tensile strength. Put a chain rated less than 10,000# on a bike with this much grunt and you're asking for premature stretch. I am currently about 10,000 miles into a new EK 530 ZZZ chain on the original sprockets. This chain boasts a tensile strength of 11,100# with a weight comparable to the average 520. The stretch thus far is minimal and even for the most part. Cheaper weaker chains will stretch unevenly. I clean with WD-40 and lube with Blue Label PJ-1 every 700 miles or so and after every sustained rain ride. Remember to spray at an angle so as to penetrate under the rollers - the only area that needs to be lubed on an o-ring chain.
I have also had excellent service out of SuperSprox sprockets on my last bike (4 rears and 6 fronts in about 100k miles) and will use them on the 919 when the time comes. However, please be aware that the lifetime warranty on their kit only covers the rear sprocket ring. You have to send worn unit off to have a new ring pressed on the hub. That spells down time and the RK or DID chain that comes with is usually more expensive. So I have found it's not really worth it to get the kit warranty. The solid black sprockets are the same material - just a little heavier.