gearbox problem

[lammydave]

My Sx gearbox is starting to annoy me..... the gear cluster mullered the bearing in the casing, so I had to strip the whole thing down and clean all the bits out....

When I put it back together the loose gears and cluster will mesh nicely and spin freely....

But as soon as I fit the endplate, even loosely, a tight spot is apparent... And when the plate is fully tightened, it's worse..

New bearings all around, shims in right place, under gear cluster etc... Even does it with a different endplate, but with no bearing in the backplate, it all spins merrily... Now I'm no expert on gearboxes, so wassup?

[WINTERMODEL150]

Put the rear hub on and torque up correctly. .if it still locks up it's possible that you need to re shim first gear..also make sure the crown wheel and spider are fitted and the centre nut is tight .

Dean

[lammydave]

thanks, dean...

did the hub up, problem still there, it all worked fine before, although I do know that the endplate is not original to the scooter...

[WINTERMODEL150]

New rear axle bearing? If so then this could give you a different first gear shim tolerance

[WINTERMODEL150]

Build it up without the first gear shim in and see if it spins freely

[lammydave]

i'll give that a try, Dean.. thanks

[tonydevon]

when you say a tight spot, do you mean it turns and then goes tight, then loose again

if so then surely something is either bent, or a gear isnt sitting central?

[lammydave]

tony

yes, that's exactly what I mean.....

thought it strange that the gear cluster mullered the bearing in the housing... so maybe that's the issue..

also, on closer inspection, one of the gear teeth is chipped...

[Adam_Winstone]

Did you do this bit too...

"..also make sure the crown wheel and spider are fitted and the centre nut is tight ."

[Yanker]

Original box with original end-plate, or 'not known' ?


You have the right cluster and loose to mesh....deffo?

Italian?

What was the alighnmet mumber in the two endplates used?