'07 WR450 Fork Oil Spec - S1?
Posted May 19, 2008 - 06:38 AM
I am changing the fork oil this weekend in my 2007 WR450, and the manual calls for Yamaha S1 fork oil. But they don't tell you what weight it is!
I know I don't have to use the Yamaha "suspension fluid" but I would like to know what weight it is in case I want to go up on the weight...
Posted May 19, 2008 - 03:27 PM
The one place within a fork that viscosity really matters is in the hydraulic bottoming cones, which work more as a variable orifice, and less as a pressure control valve.
Almost any good fork fluid will serve to replace S1 at a far lower price, and Amsoil Shock Therapy is among the best. There is another fluid that is even better, but as far as I know is not yet ready for general retail sales: http://www.smartperf...m/215VM2K5.html
Posted May 20, 2008 - 11:04 AM
Posted November 13, 2008 - 06:18 AM
Posted November 13, 2008 - 01:06 PM
Ordinary viscosity measurements don't have the same applicability to 215.VM2.K5 as with conventional fluids. Read:
I'm trying to find some specs for the 215VM2K5 oil, all I can find are ride reports, does anyone know what the Kinematic Viscosity at 40 & 100c are, and hence the viscosity index, does it carry any international standards? The reports are very encouraging but I'm worried that it's use may invalidate my warranty, with Yamaha being so insistent on the use of JASO spec oils.