1966 Atlas clutch

pierodn · Jan 3, 2021

Hi All.
I am going on to mount the bike.
Please, a question, i have the clutch assy that has a 0,3 mm of float end even if the locKnut is well tight.
I can think that is the gearbox mainshaft that has this end float that then go to clutch assy.
In any case, is this a correct and not dangerous clearance?.
As always, thank you.
Piero

pierodn · Jan 3, 2021

Checked better, the main shaft has no end play.
Is the clutch that plays onthe shaft.

texasSlick · Jan 3, 2021

Piero:

That play does not seem to be right, or even possible.

The clutch rests on a shoulder of the main shaft, and the nut clamps it tight (zero play).
Any play must be within the clutch backplate, race cage, race plate and center body.

You do know the race plate is drawn BACKWARDS in the AN exploded drawing. The groove should face the rollers.

I would disassemble and inspect all parts mentioned above.

Slick

pierodn · Jan 3, 2021

texasSlick said:
The clutch rests on a shoulder of the main shaft, and the nut clamps it tight (zero play).
Any play must be within the clutch backplate, race cage, race plate and center body.

You do know the race plate is drawn BACKWARDS in the AN exploded drawing. The groove should face the rollers.

I would disassemble and inspect all parts mentioned above.

Hi Slick.
Is the clutch dissambled with only the centre well tighteen and without chainwheel that has play.

pierodn · Jan 3, 2021

Checked again, seems to me that is the gearbox mai shaft that has endplay.
Possible?.

norton bob · Jan 3, 2021

It can be the mainshaft , a bearing, a missing spacer , but it can also be the clutch center spider that has fractured its internal shoulder . I have seen several do that .

Triton Thrasher · Jan 3, 2021

Are the nuts tight on both ends of the mainshaft?

pierodn · Jan 3, 2021

norton bob said:
It can be the mainshaft , a bearing, a missing spacer , but it can also be the clutch center spider that has fractured its internal shoulder . I have seen several do that .

Hi Bob,
GEarbox has all the three bearings new.
Missing spacer?
Where they are?

pierodn · Jan 3, 2021

pierodn said:
Hi Bob,
GEarbox has all the three bearings new.
Missing spacer?
Where they are?

Triton Thrasher said:
Are the nuts tight on both ends of the mainshaft?

Nuts well thighten.
Clutch center nut overtighten!

norton bob · Jan 5, 2021

Clutch center nut overtighten. Thats what I did on the 99 and the shoulder stop in the spider gave way and allowed the clutch to travel on the box shaft towards the box. Spacer ? I think there is one next to sprocket, I will look at manual.

1966 Atlas clutch

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