What year is this YZ 250 engine?

Fellow Vitards,

I recently bought a very bad YZ 250. Ofcourse I found out too late. Clutch bearing went and broke the case internally, bearing balls ruined the gears, nightmare moneypit scenario. Deciding if I should get used engine cases to repair the engine. But in order to do so I need to make sure what year the engine is from in the first place.I think it’s a 98 but need to be sure to get the right parts for a rebuild: engine casing shows this number: *4XL-010929*

anyone knows how to read this or where I can retrieve more info on the engine?

thanks in advance.