4LO clutch basket O ring - Does it do anything?

[fredswat]

Can someone help . I have just purchased a clutch basket O ring (the large dia thick one) . I cant seem to see one on my clutch basket. Does it fit between the alloy clutch basket and the main drive gear attached to the the basket ? If so what does it seal? I can't understand how it seals anything if it fits there. Or does it fit between the riveted plate and the gear ? either way I am not sure what it does ?

[oldbritguy]

Yes it fits between the basket and the gear wheel
It doesn’t seal anything however I think it is fitted as a vibration damper for when the clutch cush drive rubbers settle in and develop a bit of play. The big rubber o ring will act as a damper and prevent any noisy rattling between the basket and gear.
Lc and ypvs clutches are rattlers at the best of times.

[midlifecrisisrd]

Am I right in thinking the 250 never had it?

Steve

[oldbritguy]

Just checked Fowlers site for 250 parts and the big o-ring is listed as part no 7

www.fowlersparts.co.uk/parts/4041076/rd250lc-4l1-1981-999/clutch

I always thought the 250 and 350 clutches were identical but I am learning all the time that these things are never always the case 

[reedpete]

Yes, not on the 4L1 parts list

[midlifecrisisrd]

Thought not

It wasn't on my 88 rz250 ypvs either

Strve