Originally Posted by mousitsas
If on a set of forks everything seems fine, except the high speed compression which is too stiff, is it right to assume that going to a lighter oil will improve things? I suppose that the low speed actions can be compensated by stiffening the compression and rebound clickers.
Lighter oil will only help to a degree. Shim type high speed compression valves are less affected by viscosity than the fixed orifice low speed circuits. So really the valving should be modified if there's a high speed problem.