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"Cam timing kills perfectionist" -The Daily Herald

Discussion in 'FZR250.com - Archives' started by Dr Kevorkien, Sep 12, 2007.

  1. Dr Kevorkien

    Dr Kevorkien New Member

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    Ok, I feel I'm having troubles getting my cam marks aligned correctly after doing the shims. I'll say right now that I have consulted and followed all previous posts in conjunction with the manual along the way.

    It all comes down to this... I can get the two cam "match marks" in time with one another (ie, both on their marks at the same time), but I CANNOT GET them EXACTLY on at the same time as the magneto reads TDC. It's only when the T is a little past the 0 that they line up. I've worked the difference out to be 4 degrees on the flywheel, or 2 degrees on the cam shaft (which is 0.2 of a tooth).

    I know I'm a perfectionist, but quoting mat41174 from an earlier post on the subject:
    Can someone help?

    Here are pics of the cam marks when the flywheel is at TDC.
    Exhaust and Intake:
    [​IMG][​IMG]

    Am I being pedantic? or is this error caused from the wear and tear of parts? OR IS THERE SOMETHING I'M FREAKIN MISSING BECAUSE I'VE THROWN EVERYTHING I CAN AT THIS 3 TIMES NOW AND IT'S THE CLOSEST I CAN GET <!-- s:hissyfit: --><img src="{SMILIES_PATH}/th_hissyfit.gif" alt=":hissyfit:" title="hissy fit" /><!-- s:hissyfit: --> <!-- s:help2: --><img src="{SMILIES_PATH}/th_Help_2.gif" alt=":help2:" title="Help 2" /><!-- s:help2: -->
     
    Dr Kevorkien, Sep 12, 2007
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  2. NEIL

    NEIL New Member

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    CAM TIMING

    CHECK THAT THE CAM CHAIN TENSIONER IS WORKING OK,THIS CAN ALTER THE TIMING MARKS.
     
    NEIL, Sep 20, 2007
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  3. FZR250Guy

    FZR250Guy New Member

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    Had exactly the same problem but I tried more than 3 times. Ended up settling for both of them looking like the second pic. Honestly couldn't do any better, I could get them close but no way to get them on the dot.
     
    FZR250Guy, Sep 21, 2007
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  4. Dr Kevorkien

    Dr Kevorkien New Member

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    Thanks for posting your thoughts guys. Cam tensioner had plenty of meat left on it. I'm pretty sure it's "working".

    Since posting this I spoke to a friend of mine over in Vic. He's not the end-all of bike mechanix but he knows quite a bit. His opinion was that it was fairly normal wear n tear between those parts concerned that attributes to this tiny difference.

    BTW, how's your bike been running since FZR?? Just thought it was, yunno, kinda relevant in a way to your point ;)

    Thanks again.
     
    Dr Kevorkien, Sep 22, 2007
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  5. dave

    dave Well-Known Member

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    Just a thought - did you pull out the cam chain guide rail on the front side of the engine. It is a long thing that just pulls out once the chain is loose. It may have worn a little and allow those marks to move off the "exact" position.

    Either way i don't think it is a major problem.
     
    dave, Sep 22, 2007
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  6. Dr Kevorkien

    Dr Kevorkien New Member

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    Yep, sure did Dave. I think 3rd time round I put it back in after installing the Ex-cam to help keep the chain tension and stop it skipping from under the crank before I did the In-cam. Still not sure whether it was a success or not as I'm still doing the carbs over.

    Oh the fun of fizzer fuel systems.
     
    Dr Kevorkien, Oct 3, 2007
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