CLUTCH CHAIN WHEEL moves in a strange way

Status
Not open for further replies.
P

pierodn

Joined
Nov 10, 2012
Messages
3,154
Country flag
Sorry,
i have some difficult to illustrate what happens.
When i turn the clutch chainwheel it turns right.
When i turn the clutch center it turns right.
But, when i turn the clutch center, while I hold steady the chain wheel it (the chain wheel) makes each round a lateral eccentric movement.
I tried another one clutch chainwheel with clutch center but nothing changed.
Changed clutch bearing without result.
Changed the gearbox mainshaft with a new one (never used before) and.... nothing changed again.
What is the problem?.
Thank you.
Piero
 
Easy to pull the chainwheel itself and check the spinnings by hand. Eliminates that issue to search for the cause. Gearbox ?
 
pierodn said:
What is the problem?.
Thank you.
Piero
Click to expand...

British engineering ( Your beveldrive will not do that with the double row clutch basket bearing being on the shaft and not the clutch centre)

That movement is part and parcel of a spline and bearing being used on a common part, the clutch centre. When the bike is running, clutch lever pulled in with the primary chain in place it would be all but not noticeable.
The basket and centre spend most of their life turning together.

If you were to put a dial gauge on the outer ring of the basket (chain wheel ?) you would probable get a reading turning the clutch centre with the basket.
Holding the basket while turning the centre just makes it more visible.
 
It is probably a good reason Japanese bikes use a bushed centre from day one but these for the most part used larger diameter shafts.

Maybe that comes back to bevel drives which have a similar arrangement as far as the sleeve gear/ sprocket carrier.
The difference being the centre shaft stops at the end of the sleeve gear (unlike the Norton) and is used to drive the clutch on the other side of the engine allowing a more robust double row bearing running on the shaft itself.

Ducati might have had a Norton box on the bench having a looksee prior to the new 750 of 1971.
 
Well this has gone somewhat philosophical , but I would change the clutch circlip to 06-8072 , ( sanded down thinner to tap home into position ) , perhaps the old crushed original P.O.S. is clicking up and snagged on rotation ? Just a working point.
 
More like a case of don't overthink it.
If the dude tried a new shaft it probably had a reasonable condition clip.

It will still go round and round. (Not to mention the only time those parts are not rotating together are at clutch disengagement)
 
Time Warp said:
More like a case of don't overthink it.
If the dude tried a new shaft it probably had a reasonable condition clip.

It will still go round and round. (Not to mention the only time those parts are not rotating together are at clutch disengagement)
Click to expand...
Yeah , easiest stuff first. Must be the gearbox.
 
Torontonian said:
Well this has gone somewhat philosophical , but I would change the clutch circlip to 06-8072 , ( sanded down thinner to tap home into position ) , perhaps the old crushed original P.O.S. is clicking up and snagged on rotation ? Just a working point.
Click to expand...
Hi.
Circlip new.
 
Kenny Dreer goes on at length regarding Norton primary chainwheels and their imperfect concentricity.

It caused him significant warranty expense on starter-equipped VR880s...

(but nothing CLOSE to the warranty claims surrounding his Oil-In-Frame scheme)
 
grandpaul said:
Kenny Dreer goes on at length regarding Norton primary chainwheels and their imperfect concentricity.

It caused him significant warranty expense on starter-equipped VR880s...

(but nothing CLOSE to the warranty claims surrounding his Oil-In-Frame scheme)
Click to expand...
Yes, this problem cause problems with Alton that this bike has.
 
Status
Not open for further replies.
Back
Top