Xr80r cylinder head
  • xxweldonxx
    Posts: 2
    Joined: Wed Dec 23, 2020 8:09 pm

    Xr80r cylinder head

    by xxweldonxx » Tue May 18, 2021 9:45 pm

    Hey all, my son and I are rebuilding an 1986 xr80 with a 1996 xr80 motor. I purchased a new spark plug (ngk cr7hix) and found it was to small as it slides into the cylinder head. The spark plug is listed as a 10mm and I had a 12 mm that threads right in. I looked on the side of the cylinder head and it's stamped KA8-2 but I can't seem to find any info on it. Anyone know what kind of cylinder head this is? My only idea is to get a spark plug one size bigger ngk dr8hs.

    Thanks
    Levi
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    JimDirt
    Posts: 4406
    Joined: Sat Nov 25, 2006 6:31 pm

    Re: Xr80r cylinder head

    by JimDirt » Wed May 19, 2021 8:22 am

    That spark plug (dr8hs) is not shown to fit any year XR80 ... so that part in itself is strange , it shows it fits 90cc bikes

    Image

    Source: http://www.transcanimports.com/download ... 0Honda.pdf

    The strange thing is , everything I find with KA8 seems to fit a XR100 ... Maybe Ken has more insight to this ... send him a Private Message and see if he can come up with anything ... ....... https://www.crfsonly.com/forum/memberli ... rofile&u=3 Go to where it says PM: Send Private Message
    2020 CRF450R
    2006 CRF450X
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    Weiser , Idaho
  • Aussiecrf230
    Posts: 1964
    Joined: Fri Jan 06, 2006 11:11 pm

    Re: Xr80r cylinder head

    by Aussiecrf230 » Wed May 19, 2021 2:54 pm

    I think the XR100 head fitted on an XR80 but you had to watch the valves didn't hit anything.
    If I remember correctly people did swap barrel and head for cheater motors.
    That is a life time ago though.
    Like any build always make sure everything turns over and the vavles have a millimetre clearance, that's 40 thou in the old language.

    KA8 is the product code for XLS100 1982-1985 if that helps.
    KA9 was XR100 1981-1984.
    Ray
    Australia

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas

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