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CB750 K3 Oil leak

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sim2011:
Hi Seamus
You are both wright and wrong , the eraly K3 had this set and the later ones Dowels with rubber seals, my bike is a very early K3 produced December 1972 for Jan 73 launch.
My engine has never been apart and I took plenty of photos when stripping it down.
Thanks
Simon

Seamus:
Typical Honda, a new model definition, but still using the older stuff in it. I have the same with a K2 that seems to have a lot of K1 parts fitted.

It was worth a thought, although I had not realised that your motor had never been apart.

Be interested in the final diagnosis though.

Good luck

Seamus

Bryanj:
That "O" ring is part number 91309-035-000 and is 11 x 2.5

sim2011:
Hi
The Genuine Honda Head Gasket turned up Pt No 12251 - 300 - 307
This measures 1.15 (pattern measured 1.16) so it aint that
The new  O rings measure 2.44 the new old ones measured 2.36 after being torqued down.
The only thing I can assume is that the Genuine Honda gasket might squash down more when its been torqued down ?

The New Head gasket does not have any sealant on it at all ( unlike the F2 one )
This leaves with a bit of a headache
Do I use Silicone sparingly on the O rings ?
Do I use sealant around the cam chain and oil feed holes on the Graphite gasket ?
If So what does anyone recomend ?
Answers on a post card to mr confused

UK Pete:
I have made the decision to use blue hylomar on my head gasket to help seal it when i rebuild my top end and i am going to seal the o rings, rubber pucks and anything else with threebond 1194.
Before you reassemble your engine place your head on the barrel dry with no gaskets but with all the dowels and check that there is nothing preventing the two from fitting  together properly, its got to worth a try as something is not right to leak so much oil out
good luck
Pete

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