My sport has been unused for several years as I got sick of the clutch judder. Richard Negus helped me replace the cush rubbers which made a big difference, but it still juddered an annoying amount when setting off. ( it was a favour so I did'nt like tell him it was'nt the full cure he expected !).
The plates have all been checked over on a surface plate and seem to be true.
A Commando owner recently suggested replacing the bronze plates with fibre ones, need advice on that ! Apparently the bronze ones can be troublesome.
Richard suggested leaving a friction plate out, have'nt tried it , not sure if that would stop judder.
Someone I met at Stafford 2 years ago ( from Andover Norton ) suggested replacing the outer ring and circlip as any distortion on them may cause the diaphragm to run off. Seems feasable.
Just gathering all the ideas and suggestions together before I start dismantling - I don't want it to be in bits a long time and I would like to take it to the Norton Gathering at Pocklington in May.
Any and all ideas welcome !
Regards all, Terry.
F.1 sport clutch
Re: F.1 sport clutch
My Classic clutch engages in a very small lever movement . I read all the posts about that and the consensus was the diaphragm type spring and the type of lifting mechanism was to blame . Both cannot be changed without much effort. One person said to change the lift mechanism steel ball with one that is larger. My Commandos are just fine, with that type of spring.
Re: F.1 sport clutch
Thanks James,
Maybe the ball is not running true in the lift pin, worth a look at whilst it's apart. I'm wondering if the fingers of the diaphragm are not equal height so giving a bias to the pressure plate ?
Not familiar with diaphragm clutches, my other bikes are all normal springs.
Maybe the ball is not running true in the lift pin, worth a look at whilst it's apart. I'm wondering if the fingers of the diaphragm are not equal height so giving a bias to the pressure plate ?
Not familiar with diaphragm clutches, my other bikes are all normal springs.
Re: F.1 sport clutch
Having a look up about diaphragm type clutches, found loads on the Commando with references to diaphragm finger heights. Seem to be needing to be within .010" of each other, THAT will be a vital thing to check.
Not sure who has new parts for our rotary's these days..........
Not sure who has new parts for our rotary's these days..........
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Anthony Duffield
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Re: F.1 sport clutch
Terry,
My experience is solely Commander.
As the clutch lever is released and the clutch plates compress the take up of drive should be smooth, if the clutch plates do not move freely in the sprocket assembly there could be juddering as the plates eventually fully compress, perhaps removing the clutch plates and checking for wear in the clutch assembly would indicate if there was a problem.
It could be the diaphragm that's weak I would not think they are expensive, my advise is not to change everything at once as you will not know what solved the problem
As you have changed the cush rubbers it is unlikely they are the problem, my Commander has cush rubbers in the rear wheel main sprocket is this the same on your bike? if so it could be worth a look.
Tony
My experience is solely Commander.
As the clutch lever is released and the clutch plates compress the take up of drive should be smooth, if the clutch plates do not move freely in the sprocket assembly there could be juddering as the plates eventually fully compress, perhaps removing the clutch plates and checking for wear in the clutch assembly would indicate if there was a problem.
It could be the diaphragm that's weak I would not think they are expensive, my advise is not to change everything at once as you will not know what solved the problem
As you have changed the cush rubbers it is unlikely they are the problem, my Commander has cush rubbers in the rear wheel main sprocket is this the same on your bike? if so it could be worth a look.
Tony