Here's what my plug looks like. this should have been a brand new plug, per the PO.. looks ok to me? I measured the gap between .018"-.020".
I still can't find the gap spec in the manual. but what I did find is my plug type should be NGK CR 9 EBK.
82 fj40, 99 uzj100, 06 gx470
05 525EXC, 01 XT225, 07 TTR90, 07 CRF50