Montesa 49 Cota Gear Selection Problems?

[berridale]

Hi,

have gear selection problems on the little Montesa 49, anyone worked out a fix?

There is a selector fork in the clutch side cover area, this works on something like a selector wheel which pulls the selector mechanism inside the cases.

The little selctor fork sits on a shaft located by a circlip , poorly located.

It is not a tight fit , previous owner put a spring on the cover side .

I had a spare selector assembly but it is not much better , the gearbox is good so it is the mechanism.

*Wondered why Montesa didn't weld it to the shaft would have been a solution?

Appears the slackfit allows the fork to ride over the detents on the selector wheel?

Anyone been down this path?

As you can see in the pics there is a spring added on the fork end, rather than a circlip by Montesa..

Regards

Cas

Edited May 25, 2014 by berridale

[zerorev3rev4]

hard to see could do with bigger better pics , might be a job for an engineer to look at maybe have a bush made , if it is welded it may cause it to jam been solid if cant move freely maybe ,

[berridale]

The problem is with the triangular shaped fork on the shaft , the remainder of the shaft goes through the sidecover and the gear lever clamps onto it .

The fork has two flats which match the flats on the shaft , with time it wears and gets sloppy so the selection becomes vague because the fork moves away from the selector wheel when changing gears.

Both engines i have are worn in the same fashion, so i wonder what others do?

Welding can be undone, it only needs to be tacked.

[zerorev3rev4]

in that case try a tack and see if it helps ,, i see what your saying now , does it need to slide up or down at all on the shaft if not tack try and if ok give it a good weld