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Help CB 250 RS camshaft bearing conversion

Discussion in 'Honda 250cc Singles' started by siwilson, Sep 22, 2016.

  1. siwilson

    siwilson Active Member

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    Does anyone know a place to get this done in the UK please? I've been looking out for a decent replacement head for a while but not found one. My bike's running but rattling pretty badly and I'm sure the camshaft bearing surface has had it.

    Thanks,

    /Simon
     
    siwilson, Sep 22, 2016
    #1
  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    You need to pull it apart and have a look/measure. Are you sure the noise is not the chain rattling?
     
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    Murdo, Sep 23, 2016
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  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Sep 23, 2016
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  4. siwilson

    siwilson Active Member

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    siwilson, Sep 23, 2016
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  5. siwilson

    siwilson Active Member

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    Oops battery died as I was posting. Cct = tensioner? It seemed ok.
     
    siwilson, Sep 23, 2016
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  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea cam chain tensioner
     
    GreyImport, Sep 23, 2016
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  7. trevorlatala

    trevorlatala Active Member Contributing Member

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    i have not heard of this conversion is it bushes or needle rollers ?
    Trev
     
    trevorlatala, Jun 2, 2018
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Usually caused by oil starvation. I have seen them re-bushed with aluminium shells.
     
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    maelstrom, Jun 2, 2018
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  9. jimv50

    jimv50 Well-Known Member

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    there are not the quietest of heads at any time, have you checked, and rechecked, the valve clearances? I bought the special tool from Dave Silver, 07708-0030400. They may not have any in stock now but for a few quid they make the job so much easier.
    I thought mine was gone but when I pulled it apart it was perfect.
    Just trying to save you the aggravation of looking for very rare part, a good condition head
     
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    jimv50, Jun 3, 2018
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