I bought the YZ over a year ago as a backup bike and have no idea what work was done to it prior to this. I've put 35 hours on it so far, and I have no been able to fix this problem so I have just been dealing with it.
When getting the front end off the ground, it feels like there is movement in the steering stem. If feels like the top triple clamp area moves like an 1/8th of an inch. Before I even rode the YZ, I changed out the steering head races and bearings. The problem continued and I did everything from over tightening it, to pulling everything apart and making sure the races were bottomed on the lip. When all else failed, I bought a used/stock triple clamp assembly off of e-bay and bought new races/bearings. That too didn't do anything, so I replaced wheel bearings just to be sure and have had the forks apart a few times and haven't noticed anything out of the ordinary.
After riding tomorrow, I'm taking it over to my friend's house (He's a garage mechanic type like me, but his kid raced AMA Pro and he has been a mechanic for other pro riders) and we are going to both take a look at it. Maybe with two people pulling on the forks while it's on stand will tel us what the issue is. He thinks it may actually be in the forks because "what else could it be." The only thing else I could think of is that the steering head wasn't pushed in all the way so the inner diameter of the steering stem had some play on the bearing. I remember that was a concern, so we had checked that like 2x. If any of you can take a picture of the top nut of triple clamp, that would be awesome. I'd like to see how much threads are showing above the nut, or if it is flush.
Anyone have a similar problem?