- Fri Jul 24, 2015 2:59 pm
#49604
Thanks for the confirmation that I correctly understand the problem you have.
As I am sure you know these are a constant mesh gearbox and the gears are selected by the gears sliding along the shafts and dogs engaging to
lock the gears together so different ones become the driven gears whilst the others idle.
Two things can cause the problem that you have, 1/ On some gearboxes the dogs engage with holes in the inner ring of the gears
on these boxes after high mileage the dogs can wear into a T shape if they protrude right throught he holes, this has the effect that
they effectivly lock in place and make gearchanging difficult, 2/ The dogs are held tightly together by sideways pressure and when trying to obtain neutral
more pressure is required on the lever than normal, as the space between first gear and neutral is quite small and the recess for the ident plunger
is also smaller that it is in a gear location the lever will jump straight through neutral and engage second gear instead.
Having looked at the exploded view of your gearbox
I can see yours does not engage in holes but dogs engage with dogs, therefore the first of these problems cannot occur,
which only leaves the second, as the sideways pressure comes from the rotation of the engine then some amount of drive is
passing through you clutch (a small amount of drag),
this can be caused by the clutch plates not lifting enough, not lifting straight, the plates being warped, the primary chain being too tight (pulling on the chainwheel) or
oil drag on the clutch plates, you only need a very small amount of drag to give you a problem.
I know you are convinced that it is not clutch drag causing your problem but unfortunately I can see no other reason and all the description
of the fault you have given points to clutch drag.
