I found the solution as instructed by Arlen Ness:
"Thank you for your inquiry. Per our technical department, was the included PVC used? We usually use about 1” of the PVC in each fork leg to pre-load the springs"

And yes the PVC weren't installed. I'm gonna install them and everything should be fine.

Thanks guys for the great help.

 

Could be... but it begs the question, "why was it okay for the first 1100 miles"? Best of luck!

 

Mr. Lucky
No idea at all. I asked Arlen Ness and they said we have no idea.

Anyway, I installed the PVCs today and the bike runs smooth and the problem has been solved.