Yamaha Z300A Supplementary Service Manual page 62

LOWR
5. Install the new needle bearing into the
reverse gear to the specified depth.
Needle bearing attachment 7:
90890-06653
Driver rod SS 8: 90890-06604
Depth b:
6.75–7.25 mm (0.266–0.285 in)
6. Install the thrust bearing and reverse
gear into the lower case.
55
Lower unit
6D03F1X