SOHC.co.uk Forums > CB500/550

500 4th gear AWOL

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z1100r:

--- Quote from: Bryanj on February 17, 2012, 07:40:16 AM ---There is no one gear over any other that breaks but all can if abused in the past, i have seen dogs sheared off before now.

Gears and selectors are getting more and more difficult to find and 550 ones don't fit (maybe SOME gears before i get jumped on!! but a lot dont)

--- End quote ---



  Sorry Bryan I have to disagree. There is a gear that is particulary weak on the 550.....its 3rd if I remember right, Honda later modified it by blanking off the dog slots at one end. I broke 2 3rd gears when racing, and finally fixed the problem when our local Honda agent showed me a service bulletin and produced the more solid 3rd gear.
   My race gearbox (the one thats in the restored bike as it stands) was constructed of mix and match  500/550 parts with the beefy 3rd included. (I agree there are some that are not interchangeable).

  As a race tuned 600 my Honda's original 3rd gear was nearly as bad as all 6 are in the 'chocolate' Suzuki RG500.

Bryanj:
OK I admit to buiding a box using 500/550/650 gears but as i said ONLY SOME fit and its PItheA working out which!

matthewmosse:
Just as well. I have about 5 mixed gearboxes off 500/550s in boxes. I know I've built a hybrid box and clutch which was a pita as i got the gears right but the shaft is different and cases and cluch didnt suit my available bits so it was a bit of a build up and strip down twice thing

Bryanj:
Even worse is the fact that Honda at sometime changed the tooth profile so gears frequently have to go in mating pairs

Beemer634:
Hi

I had the same problem on my 550 last year, the guys here were right when they said the dogs can break off, thats what my problem was. Bit of a pain having to pull the motor out but reasonably easy to fix though. It is now a joy to have them all back!

Rick

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