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550k3 oil seals

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Trigger:
Strange as the Exhaust valve guides usually go before any inlet guides  :o

It doesn't matter if you put a small pipe, it will still need a o ring around it to seal.

I am sure i have reconditioned a head from a member that had the same problem and it was a crack in the valve guide   ;)

Bryanj:
Trigger is probably correct there or the bore is oval, damaged,too big.
Personaly only ever seen those seal leak outwards as fire ring in gasket seals well plus you need a new gasket every time if its been run

Trigger:
Bryan is spot on, you always have to change the head gasket and all the o'rings if fitted and the engine run.

It was Roy Hall that had the same problem and it was a hairline crack in the valve guide from what i remember. But, that was his engine and your engine is yours  ;)

Moorey:

   Didn't Roy only find the cause by having his cylinder head eddy current crack detected. It was on his 350f.

bigmockuk:
thanks guys,i do remember on just one occasion the bike was ticking over and there was one gush of air from the front left between the head and barrel,just that one time,might be worth taking valve springs off no1 and have a look and recheck head again altho it was the opposite side,no 4, that was slightly warped at the start,the smoking is not unbearable,just under acceleration and the plug was black sooty but no actual oil on the plug just like i say a mist on the piston crown,gonna have a good look at it today. will fit new gasket and inlet valve seal too,would it be better to use a small layer of gasket sealant before fitting the oil seals do you think?

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