When did YZ go to aluminum frame?

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Tags

1. #unleashed
2. #years
3. #changed
4. #their
5. #tiddler
6. #mediocrity
7. #since
8. #first
9. #monster
10. #tuesday
11. #after
12. #stroke
13. #yamaha
14. #aluminum
15. #yz125
16. #frame