Valve stem oil seals.
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    Member Bikenutmart's Avatar
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    Valve stem oil seals.

    Overhauling the head on my 1971 CL175, it only had the seals on the exhaust valves, is this correct, I bought a full gasket set but was surprised it didn't contain these seals, anyone know where I could get some from? Many Thanks Martin. Also do you only replace the little o ring that sits inside the cupped holder?

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    Senior Member TOOLS1's Avatar
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    You do not really need valve guide seals, but if you do want to use them, just put them on the intake valves.
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    Member Bikenutmart's Avatar
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    Just checked the manual and they are definitely only on the EX valves?

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    Member Bikenutmart's Avatar
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    Really confused now, just been on ebay and these seals are being sold for the inlet and exhaust? could someone please put me right! Martin.

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    Senior Member Richard_Pitman's Avatar
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    That's correct, only the exhaust valves. I also found this suprising, I always thought that inlet valve guides were a cause of an oily exhaust, inlet manifold vacuum drawing oil down the valve guides. Certainly was on 'A' series engines in my misspent youth.

    The CNMSL parts listing shows the inlet valve seal as in two parts, but the aftermarket ones are just a single seal.

    Confusingly, Wemoto list seals for both inlet AND exhaust, think this is a longstanding error on their part.


    https://www.davidsilverspares.co.uk/...72/part_50250/

    https://www.wemoto.com/bikes/honda/c...tem_seal_inlet

    Valve stem oil seals.-valves.jpg
    Last edited by Richard_Pitman; 11-08-2019 at 11:40 AM.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

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    Member Bikenutmart's Avatar
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    Thanks Richard, I have a selection of o rings if I have one the correct size, do you think it would be ok, inside the little cupped holder?

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    Senior Member TOOLS1's Avatar
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    Quote Originally Posted by Bikenutmart View Post
    Really confused now, just been on ebay and these seals are being sold for the inlet and exhaust? could someone please put me right! Martin.

    I thought I did.
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  9. #8
    Senior Member Richard_Pitman's Avatar
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    Quote Originally Posted by Bikenutmart View Post
    Thanks Richard, I have a selection of o rings if I have one the correct size, do you think it would be ok, inside the little cupped holder?
    For the price, I'd go for the exhaust valve seal from Wemoto.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

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    Member Bikenutmart's Avatar
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    Yep, Ordered from wemoto on Friday !!!

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    Member Bikenutmart's Avatar
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    TOOLS 1 you said only on the intake, but it appears only on the exhaust. Mart.

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