Yamaha YBR 125 workshop manuals on Ebay UK
on some it was the clutch adjustment , worn clutches or old/incorrect oil being used .
i have just done a search and it seems to be a common problem , ill keep looking for an answer .
but here are common causes of gearbox problems .
Does not go into gear , lever not turning .
- clutch not disengaging ( see clutch post here )-selector fork bent or not moving seized ( when dropped or bad/wrong oil )
-gear stuck on input/output shafts ( can be caused by dropping/oil/wear)
-selector drum binding (causes wear / or lubrication )
-gear change lever spring weak or broken ( main cause i have come across so far )
-gear change lever broken or splines worn
-selector drum stopper arm or arm spring broken/worn
jumps out of gear
-selector forks work
-gears work
-gear dogs or slots worn/damaged
see more Yamaha YBR 125 blog posts
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