Your information is correct. Do you have the service manual? It is available for download somewhere on the forum. Chain specs are on page 11-4. BTW, the make of the chain is ENUMA. Also BTW, the bikes are the same worldwide, except for California with their little evaporative canisters.
The Versys is my first chain drive bike since my 1980 Honda. What advantages do aftermarket chains offer?
For me it's probably just brand loyalty. I've used DID chains since they have come out with the X-Ring (VM). My understanding is the RK version of the X-Ring (XSO) is every bit as good. For the most part, they just last. When it came out on the market, most chains (O-ring type) got about 5K to 8K. The X-Ring was getting 10K to 15K. Huge difference. The stock chain on the Versys is probably an "X-Ring" type as I've gotten 10K out of it and it will probably go another 2-3K more.
Now DID has the X^2-Ring and the RK has a similar one, (GBO, I think) that supposed to add another 4-5K on top of the X-Ring for another $10 or so.
There are those that claim the DID & RK racing chains impart less friction and therefore transfer more hp to the wheel, but personally I doubt it's noticeable, if it's even true.
Last edited by acinonyx; 03-24-2009 at 10:06 AM.
Reason: Added quote.