help finding year on yt125

[edson]

i cant find the exact year for my yt125 im restoring is there a diffrence for parts in the 123cm engines, my vin on the engine is 4u3-010407

[TrikeKid]

4u3 is the prefix for an '81 YT125H (last letter of the model is the year identification, 125s started with G in 1980 and go in order from there). The engines on the 125 stayed mostly the same but the frame on the 80-81 has some differences vs the later bikes.