Troubleshooting

Jumps out of gear

~1min read

Shift shaft

  • Incorrect shift pedal position
  • Improperly returned stopper lever

Shift forks

  • Worn shift fork

Shift drum

  • Incorrect axial play
  • Worn shift drum groove

Transmission

  • Worn gear dog

Test yourself

A quick Yamaha YZF-R125 quiz: every answer comes with an explanation and a link to the manual page.