- Shift drum groove. Damage/scratches/wear → Replace the shift drum assembly.
- Shift drum segment "1". Damage/wear → Replace the shift drum assembly.
- Shift drum bearing "2". Damage/pitting → Replace the shift drum assembly.
Checking the shift drum assembly (Yamaha YZF-R1 Y(C))
1. Check:
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Checking the transmission
Checking the shift forks
Removing the transmission
Disassembling the drive axle assembly
Disassembling the main axle assembly
Removing the transmission, shift drum assembly, and shift forks
Installing the shift shaft
Checking the stopper lever
Checking the shift shaft
Removing the shift shaft and stopper lever
Checking the shift forks
Removing the transmission
Disassembling the drive axle assembly
Disassembling the main axle assembly
Removing the transmission, shift drum assembly, and shift forks
Installing the shift shaft
Checking the stopper lever
Checking the shift shaft
Removing the shift shaft and stopper lever
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