we have just aquired a 23 and it has `lost` second gear, it selects first ok but when you hook second it goes into a false neutral, then when you hook third its fine and visa versa on the way down. i realise that the engine is going to have to come out but has anyone else suffered the same problem.
Den

Both the 23&29 are known to suffer with 2nd gear problems.

Once you have stripped it you are likely to find word selector dogs, replace these good as new.

Thanks tanuki, if it is a worn selecter, does the aero share the same engine conponents? or will it have to be from a 23
thanks again
Den

No idea but I very much doubt it, all 3 of the cbr range were very different bikes.

thanks for your help

check out the "cmsnl.com" web site

the aero and the j/k model share the same part numbers but the 29 numbers are diffrent

L=O

We took the engine out and split the cases, the problem was the second gear pinion had shattered and was lying in the bottom of the cases .luckily there seem to be no other damage.
Going to see if i can get the second gear pinion on its own rather than replace the whole input shaft
anyone know if these are available on there own?

thewhizzard wrote: Going to see if i can get the second gear pinion on its own rather than replace the whole input shaft
anyone know if these are available on there own?

Try contacting Graeme France, he seems to have most parts lying around!

i have a spare engine in bits, if your still after it i can strip the bottom end and ill post it for a £5 mate.
Always happy to help fellow nc23 riders out

Any other bits you need just give me a shout i have loads of stuff

Petrolhead19 you have a pm

ta

Den