Originally Posted by DaveInDenver
The 4-digit (e.g. XXYY, week/year) date coding didn't start until 2000. Before that it was two digits for week and a year digit, so 33rd week of probably 1993.
So then, if these don't have the 4-digit code, then they're older than 2000? which means probably too old to run.
82 fj40, 99 uzj100, 06 gx470
05 525EXC, 01 XT225, 09 TTR125, 07 TTR90, 07 CRF50