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  1. #1

    Join Date
    Jun 2012
    Posts
    21

    Cam timing CB450

    Hello everybody. I just found your forum and I'm hoping you can help me. I'm "baffled".
    I'm restoring a 1974 CB450 and in the process of removing the cam bearings to polish them I managed to get the cam timing off. So, I broke the cam chain and have set the cams several times now according to the HONDA service manual and every time I button things back up, when I try to turn the engine over, I have valves hitting pistons. I'm setting the crank on LT, and lining up what I believe to be the marks on the cams but it will not work for me. Ive even tried rotating the cams 180 degrees, but still no luck. Its really hard to tell what is a timing mark on the cam and what is a casting mark. Any ideas? This is nerve wracking!
    Thanks,
    Chris

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  3. #2
    Super Moderator frogman79's Avatar
    Join Date
    Nov 2010
    Location
    Ninnekah, OK
    Posts
    4,026

    Re: Cam timing CB450

    Timing marks usually look like very light chisel marks. Like it was put there instead of cast in.
    Franz >>> 450 build >>>360 Build

  4. #3
    Super Moderator nigelrharris03's Avatar
    Join Date
    Jan 2009
    Location
    Southampton UK
    Posts
    8,033

    Re: Cam timing CB450

    [attachment=3:vx7z707e]100_1633.JPG[/attachment:vx7z707e][attachment=2:vx7z707e]100_2613.JPG[/attachment:vx7z707e][attachment=1:vx7z707e]100_2641.JPG[/attachment:vx7z707e]

    These should help I have painted mine gold to highlight them
    Attached Images Attached Images                
    Nige
    CB450K0 Bomber 1967
    CB650Z 1978

  5. #4

    Join Date
    Jun 2012
    Posts
    21

    Re: Cam timing CB450

    Thanks, guys! You know... I've been working on bikes for many years, including Hondas and I've NEVER seen timing marks on a cam as faint as those. My gosh! You could barely see them at all. I really had to look closely with a drop light 2 inches away to see them. But, I think I found the right marks, I put the cam chain back on, turned the engine over by hand and it seems just fine. Nothing is hitting. I must have gotten it this time. I guess it works better when you use timing marks instead of casting marks!!! However... In my excitement at finally finding the right marks and making progress, I crimped my master link before I put the backing plate on it. Sometimes I do the stupidest things! So now I have to call Honda and order another new master link. Anyway, thanks for your help!
    Chris

  6. #5
    Senior Member paleodad's Avatar
    Join Date
    Aug 2011
    Location
    Texas
    Posts
    189

    Re: Cam timing CB450

    Feel your pain, see my post in this same section, "Top end HELP? Frustration setting in!" Finally worked through my problems...finally! Good luck to you.
    Jerry
    '14 CRF250L
    '13 CB1100
    '79 CM185T
    '72 CB450 K5 (nearly finished 3 yr. restoration)

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