Hi, There is a discrepancy for the recommended fork oil weight between the Kawasaki web site and my service manual: one says 0 wt when the other says 10 wt. see there: http://www.kawasaki.com/DefaultFrame.aspx?strContentURL=/SITE/VIVEHICLEINFORMATION/VICHOOSEVEHICLE.ASP This is for the 1st gen fork '05. Any suggestion?

I replaced mine with 10. Like you said, I read it in the service manual too.

is that it? Only one people here has ever changed his fork oil?

http://www.zx-10r.net/forum/search.php?searchid=2667039

Stock based on the service manual is 10-15 weight oil

http://www.zx-10r.net/forum/search.php?searchid=2667039 "Sorry - no matches. Please try some different terms. "

The 2004 manual calls for 10-15 KYB oil. Good luck tring to find it. The 2005 manual calls for 10w oil. I changed the oil in my 04 last winter and I used 10w Belray fork oil at the recommended height as called for in the 04 manual. Worked fine.

Thanks for the input. I looked for the Kayaba viscosity but didn't find anything for the 10-15. They have a "1" and a "zero-one" that have a low viscosity (more like a 0-5 than a 10). The more I look into fork oil viscosity the more I get confuse. The SAE index doesn't mean anything since the viscosity change for different manufacturers. See there: http://www.peterverdonedesigns.com/files/suspension%20oils.pdf or http://www.motul.com.au/product_line_up/fork_brake_others/images/PDF/FORKOIL_EXPERT_BLEND_CHART.pdf

I changed the oil and replaced it with a 10 wt (Maxima 165-150). The fork behaviour is about the same as it was so I am pretty convinced that a 0 wt as indicated on the Kawasaki web site would have been way too light. A big big thanks to this forum for the clear and detailed how to procedure: http://www.zx-10r.net/forum/showthread.php?t=83762

Not sure about the 1st or 2nd gen, but Goldfish and I just re-did the seals and fluid in my forks this past weekend and I used 5W as per the service manual for the 3rd gen. It is damn nice to have my AK-20's back on the bike, but it is also nice to have a spare set of stock forks so no down time for service... BIG thanks to Goldfish for the help, and Garth for the fork seal install how to (even though Goldfish knew what he was doing).