Additional oil seal in engine kit CB750 RC01 1979

[psh]

Hi. I'm rebuilding engine from scratch. I bought Tourmax OSL-112 engine oil seal kit. There is one seal i have no idea where to put in. I also reviewed service manual and i didnt find anything looking like this one. I suppose it's extra seal not used in RC01 motor but i have to be 100% sure before i start to assembly everything. Thanks in advance

 

[psh]

I got it. Its a seal for cb900 and cb1000, it covers the bearing on primary shaft. Seems like engineers wanted to reduce oil flow to the clutch side.. or there is dry clutch in these engines. Anyway i won't use it in RC01.

 

[Tune-A-Fish]

I wonder if its not the other way around, preventing excess oil from passing "from" the clutch side. Does the bearing on the cluch shaft have a seal? the retainer ring is inside on one and outside on the other.

Has to be a reason for it, not sure you need it.

 

[psh]

Hi. Bearings are the same (open) with no seal on the primary shaft and on the clutch shaft.