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CB750 K3 Oil leak

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BigAl (Alan):
Hi Simon,

I have a K4 (same colour)  not changed the top head set, but I did overhaul the carbs last year and had a few problems with  setting up (purchased a standard CB750 carb kit,120 main jet)
Anyhow after a bit of reseach I found that the USA immision laws changed in 1973 and the carb main jet was replaced with a 105 unit (K3,4,5) which runs hotter & leaner...I think..??.. Honda also modified the head gasket to compensate for the extra heat, hence the copper rings on the origonal gasket.

Hope the information helps, and please let us know if the new gasket has copper rings

Alan

sim2011:
To all

Quick update, I've just collected the barrells & Head from SEP and they have skimmed both.
The head was warped and the barrels had a slight dip in the middle.
So now I have
New Honda gaskets
Flat metal surfaces.
I am going to use sealant just havent decided yet on Blue Hylomar or clear silicone.
I'll keep everyone posted .
The new Honda head gasket does not have copper rings
Thanks for everyones input.
Si

Seamus:
How much out were the head and barrels? Please keep us posted with reference the rebuils and subsequent oiltight engine.

Good luck

Seamus

K2-K6:
It'll be interesting to see how you get on, did they say how much they skimmed from each surface?

Hopefully you'll soon have it oil-tight and able to enjoy a good run out, thanks for keeping us informed it's alway's good to see the full story and eventual progress.

K2-K6:
Didn't put enough detail in last post but the question about how big a skim has an impact on cam chain tensioner also as the total shift is doubled (2 runs of chain, up and down) so the tensioner will reach max tolerance earlier in the chain wear cycle.

Be interesting to see how you get on as I've never worked on one with a skim to my knowledge.

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