A simple question that needs a simple answer.

[TowerMan]

Originally Posted by Topbox

For some reason 10w oil is used quite a lot by dealers, maybe because its in the middle of the range.

5W oil is the recommended weight. Some people go on about centistokes but plutolene or motul 5W is good. If I remember correctly the Kawasaki manual recommendation has a number 10 in it, this is still equivalent to a 5W oil.

TB

On the Motul Fork oil comparison chart the Kawasaki manual recommended fork oil is KHL15-10 - This has has a Viscosity at 40°C = 15.3 mm²/s



The raven 10w fork oil on this link HERE has a stated Viscosity at 40°C = 32.8 mm²/s

You are easily doubling your viscosity, so you may need to open the rebound dampening screw up quite a bit to compensate / stop any hydraulic locking of the forks

See tis video on how to easily set it up properly 

[TYKE]

I guess we should have known there wouldn't be a simple answer to a simple question