Hi to all

I have a 1981 cota 349 which had one problem when I bought it. The gear shift only engaged 1 & 2 gear and that very badly. As the front wheel hub was brocken it took a while for me to find this out and after opening the casing I found the cam was obviously in the wrong position so that it wasn´t possible for it to move any further after 2nd to engage a higher gear. After having moved this back I could get all the gears but 2nd. was very difficult to engage and could only be selected from 3rd. going back down. I have now tried again but cant get the right positioning of the selector unit as I don´t know how it should all be.

At present I can now get 1st and 2nd gear (and neutral) perfectly but no other gears can be found. If any one has a Daigramm or something like this I want to try again soon. Thanks to all

I have been looking at gearbox selector on my latest 348.

I found this which may help you.

http://www.rmmontesa.com/shiftingdifficulties.htm

I have another question;

anyone know anything about the additional indexing device fitted to my 348 ? I have three 348 engines, there is the ratchet device that common on all of them and most other Montesas but this third engine has an additional index plate fitted to a square peg on the end of the selector drum. it uses a crude looking spring and roller arrangement.

Most of this engine has been thrown together so I am trying to find how to set this part up or if i should miss it out altogether.

I hope this photo works. Any one know if it can be left off or how it should be set up?

Hi there,

We have made a set of notes for setting up the 349 gearchange.

Send a PM for details.

Best regards.

I have had a 348 engine lying around for a while and took it apart yesterday.

I found that there are two types of gear selector used on the 348 engine.

Both have a shaft that is indexed by the spring plunger you find under the big bolt at the back of the gearbox case.

one version only has one indent and uses the cam and wheel device.

The other has 6 detente slots and no detente wheel or cam plate.

this may be useful if you are buying second hand gears. None of my parts lists show the cam plate version.

I have not swapped everything round yet but they look interchangeable.

Hi - I have had the gear box stripped and it is working on the bench, but there is too much movement in the gear selector drum, so it is vibrating and then jumping into gear.  Does anyone have a picture or diagram showing the selector drum set up pls?

Hi there just wondering what makes it jump into gear when on tick over  mine is a montesa 348

left mine on its stand and just jumped in to gear tipped over only broke clutch lever  glad it was just that

regards phil

This is a common issue on old Cotas - IIRC it's either a worn gear selector cam, or not enough pressure on the ball bearing that holds the cam in place, or a combination of the two

Great , I purchased 348 from ebay looks nice complete clean piston ,, think I better check the trans  ,before installation ,  thanks for the heads up ,larry