Crucial Sur-Ron Maintenance Fork and Steering 

Having the same issue with my MX4 and also have a moto background. Bel-Ray grease brought back many memories!! Where are you riding at the end of the video? Look's like an awesome spot to check out.

Thanks

Did you even ride it in the rain? Dump it sideways into a stream? Just curious. A replacement headset should have sealed -2RS bearings. Advice, always re-grease the new bearings, don't trust them to have grease int hem, usually a new bearing has almost no grease in it. Use a urethane bicycle grease like Park Tools grease.