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CB750 K3 Oil leak

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mick:
Just my 2 cents worth , i've never had to use sealant apart from under the cam tower pucks & the crankcase halves, just made sure all surfaces are nice and clean, cheers Mick.

sim2011:
All
Thanks for the input , I have just been looking at the parts manual fiches and the K2 US head gasket clearly shows rings of some sort around the holes so these will be the copper ones in my pic , my guess is that they used this on mine as its a Dec1972 build date.

Bryanj:
I have a parts book so early its on thick individual pages dated 1974 and yes it does look like there is something but there was/is only one part number for the gasket from the CB750 to the K4 (thats as far as the book goes)

Bryanj:
Just been playing with DS website and a K2 top gasket kit is discontinued but the 750A top set exists at

rigwit:
To me, the risk of using Blue Hylomar is only to avoid ANY loose sealant floating around as it survives in oil. The rest is all upside, as previously posted (by rigwit?) this stuff is seriously good.

blue hylomar is actually for pipe threads, but is a great gasket sealer for uneven parts it is non setting in a sense, but does harden up a bit -  like half way from blue tack to Plasticine. Golden hylomar is non setting but isn't as resilient as the blue for imperfection filling and red is totally setting only ever used red on waterpumps and diff casings. another tip is I always coat non metallic gaskets with a layer of grease both sides helps with instillation sealing and doesn't make the gasket dry out and go brittle so if ever have to take cover off its a doddle.............

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