I had the same issue with transmission of small hard hits to the bars and my front tire deflecting off stuff. By small I mean rocks, roots and ruts. Sharp stuff 2, 3 or 4" high. I've more or less cured this by opening up the compression and rebound damping clickers, but that has side effects and isn't the proper way to do it.
Clickers open or close an orifice and orifices are low speed damping adjustments. Rocks, roots and ruts are high speed events and the shim stack(s) should be modified in the forks to handle them. Fortunately the 2012+ WR450Fs run a bleed stack on the compression clicker. I'm guessing that the orifice area on the compression clicker is pretty large as far as clickers go and the bleed stack is handling a large component of the oil flow from these high speed events. Normally clickers wouldn't make that much difference on high speed events. Its good that Yamaha built a bleed stack into the WR fork, but for woods use things should be done differently.
I keep saying that I'd like to revalve my suspension this week, but I'm also of the opinion that I should only be changing one thing at a time so I know what is actually happening with each change. Right now my fork oil is too low, so I need to put it up to the right level and do a ride on that. I expect that increasing the fork oil level is going to increase the jolts to the bars because as the forks travel to absorb them they will generate more force via more progressive air springing from the higher oil level. But we will see if that plays out or not.
And I have a set of 22mm offset triple clamps on the way here. I should install them and experiment with a couple new handle bar locations. Both of these should be done before I start revalving my forks.
I want to try to minimize how many times I pull my forks apart to revalve them. I am going to use Restackor to try to predict what each shim change is going to do. I believe I have enough information to start modeling the WR forks over the next couple days. I don't have the exact piston dimensions for the WR components. But I have 2009 YZ piston dimensions, which should be pretty close. I'll update the simulations with WR piston data once I pull my forks apart.
Edited by MidlifeCrisisGuy, August 20, 2014 - 07:03 AM.