Topic: 1976 750K, replacing pucks, need help with a part number for o rings

[stickman]

I need to replace the 6 Sealing Rubbers under the cylinder head cover.  After researching this site I have identified the following parts I need:

6 Sealing rubbers, part number 91318-300-013
1 breather cover gasket, part number 571438
1 Cylinder head cover gasket part number 571643
4 small orings under cam tower

The last item is what I need help id ing with a part number.  I am using the Bike Bandit site if it makes a difference.

So, can anyone assist with a part number for the 4 o rings?

Many thanks in advance.  Stickman

[fire113]

...I am not sure but I only have the part numbers for K0-K2--> 91317-300-003  (O-Ring 3.7 x 1.7mm)

[MCRider]

...I am not sure but I only have the part numbers for K0-K2--> 91317-300-003  (O-Ring 3.7 x 1.7mm)

His 76K takes a larger diameter ORing than the early Ks. I'll be back with the number. I'm going to motogrid.com anyway.

[MCRider]

They are 91305-323-000 x 4, 5.8 x 1.9mm for $1.85 ea.

Fire113: I see in the parts diagram you provided the "323" O rings are shown as the later model ring. I think the later K2s had the larger ORing as well.

[fire113]

Hi MCRider,

...have to look at my pictures, not sure what kind of o-ring I used last year as I did the K2 engine but I think that I used the large o-rings, can't remember right now, have to check the pictures to be sure.

edit--> Yes! I used the lager o-rings 

[MCRider]

Hi MCRider,

...have to look at my pictures, not sure what kind of o-ring I used last year as I did the K2 engine but I think that I used the large o-rings, can't remember right now, have to check the pictures to be sure.

edit--> Yes! I used the lager o-rings 

Based on my references, the larger ORings started at K3. But i thought some later K2s had them as well, a mid-model change.

Just an additional tidbit: The "323" center digits indicate CB500, so they are shared with the 500 at some place.

I see you're from Germany. Wasn't the K2 the latest model to arrive there? Then it was upgraded a few years later?

[fire113]

...after the K2 (K3-K5 left out for the German market) Honda went on with the K6, and K7. May be the PO changed the head, You will never now hat the PO did.
As I opened up the engine  ...takes too long, that is an other PO story 

Have a good one...

[MCRider]

Oh, I see.   

[stickman]

Thanks all, especially MCRider.............Great info.