Front Fork Oil

My kawasaki manual for my KZ1000-P7 call out 10W20 for the fork oil. I can't source that. Should I just pick an oil between 10 and 20 W? I'm assuming the heavier wait oil would produce a stiffer fork. Little help.

I've used Bel Ray 15W Fork Oil since my bike was new and it has always worked great. I replace it every 2 years. Be sure to measure the fork oil level correctly using the specs in the manual. You measure it from the top of the fork tube down to the top of the fork oil level (like the oil dipstick in a car engine) using a rod or wooden dowel. The manual will give the correct distance and whether or not the springs should be in place during measurement. The front end must be elevated off the ground and the forks fully extended while measuring, and it's good to go back and check again after putting some miles on the bike in case any air pockets were in the fork cylinders. One really nice thing about Bel Ray fork oil is that they offer a bunch of different weights from 2.5 - 30w (see link), and they can be mixed if you wish to fine tune the forks for a specific stiffness. Straight 15w works fine for me, and I've never had a seal leak. Ed

www.belray.com/bel-ray-high-performance-fork-oil

agree 15 w maybe you might like 20