CBR 125 Gearbox issue

Soldato
Joined
7 May 2008
Posts
3,151
Location
Bristol
Hey guys

As you are all fairly smart chaps I wonder if someone has any ideas abut an issue that has developed on my 08 CBR.

Pulled up to some traffic lights and was changing down from 4th to 3rd and the gearbox wouldn't select 3rd gear. Pulled it to the side of the road and managed to get it to select the gear by letting the clutch go and it popped into gear. This is now happening on all the gears but not every change. 1 - 3 seem to be fine most of the time but 3 - 6 have this issue more that 1 - 3.

The chain was a bit slack to adjusted that, problem still there. Gear lever assembly was cleaned from the lever to the engine and lubricated, problem still there. Clutch cable adjusted, no change. Before I take it to a mechanic is there anything you can suggest?
 
it happens when the engine is cold when not moving and when moving mostly when changing from 3rd up and above.

put new oil in today so will run it for a week to see if that helps.

fingers crossed that fixes it before i have to change the gearbox...
 
well it still happens when moving when changing up from 3rd and higher. the engine was hot yesterday and i managed a good 10 mile ride after a shorter one and it was fine for the second journey. will see how the bike likes the power 1 oil instead.

i do my own servicing with the old man and neither of us have come across anything like this before.
 
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