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Always the 3rd rod (not mine)

Harriminator Dec 28, 2018

  1. Harriminator

    Harriminator Senior Member

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    $_59.JPG(22).jpg

    $_59.JPG(24).jpg
     
  2. 87kawzl

    87kawzl Supporting Member

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    One reason to be careful when replacing cdi boxes, some do not have the Rev limiter. Things can get ugly in a hurry with an oil slick in front of the rear tire when winding up the bike. Glad I've never experienced anything like that!
     
  3. GaryD

    GaryD Supporting Member

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    Just the excuse to go to 1200.
     
  4. slug

    slug Senior Member

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    Some ZLs have rev limiter? Pretty sure mine doesn’t I’ve done some horrible over revs missing gears...
     
  5. Harriminator

    Harriminator Senior Member

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    When the 'red zone' is left behind it's getting better...:laughing7:
     
  6. 87kawzl

    87kawzl Supporting Member

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    I think the ZL has a limiter and the ZX boxes have none
     
  7. slug

    slug Senior Member

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    Why do you think that - have you or anyone else ever experienced rev limiting on their ZL?
     
  8. Harriminator

    Harriminator Senior Member

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    I doubt that; ZX900, ZL900 and ZG1000 have all same CDI: 21119-1111.
    21119-1111.jpg

    To eliminate the rev limiter must be changed something inside, I think... ign_comp_side.jpg
     
  9. 87kawzl

    87kawzl Supporting Member

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  10. slug

    slug Senior Member

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    What on earth? Looks like some out of period SMT circuit board added in there?
     
  11. R. J.

    R. J. Supporting Member

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    :hello: When a motor implodes like that is that caused by hydro lock.
     
  12. paulfun

    paulfun "King Of The 1/4mi (Internally Stock)"

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    That wasn’t hydro lock, that was the #3 rod coming then the block.
     
    R. J. likes this.
  13. Harriminator

    Harriminator Senior Member

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    I understand it as you were not in a gear when opening the throttle, so this was a short time revving up the engine and maybe you didn't reached the limiter...? A CDI w/out limiter makes no sense to me and the Japs know this as well (valve bouncing), you have to open full throttle for at least 3...5s in no-load operation to find out if the limiter responses by hearing the typical 'tat..tat..tat' of missing sparks

    I compared all micro fiches I have on my Kaw-CD concerning ZX, ZL & ZG so they are all the same type no matter what building year; when the Japs change something a new number will be assigned. (I even don't understand this '...WILL ONLY FIT IN THE 83-85 Gpz750 models'...:dontknow:)

    Nope, hydro lock looks more like this:
    19917478ns.jpg
    IMGP0469.jpg

    The reason for this crack was a lack of oil lubrication like I was told once by Niek during a gathering; the holes in the crankshaft are getting smaller from the main bearing so this bearing #3 is undersupplied like the piston in this cylinder and on high revs it's just a Q of time till the mechanical demand is too strong for the material => either the rod bolt or the rod itself breaks. He told me that he drilled bigger holes into the crankshaft (not my biz) so I followed the instructions of ZLMark to raise the oil pressure & quantity and added a ZX-oil cooler on my modified ZL-pan. https://www.zl-oa.com/community/threads/oil-mods.17251/

    :thumbsup:
     
  14. R. J.

    R. J. Supporting Member

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    :hello:
    :hello: OK: Thanks. Would this happen from using heavier weight oil. Since I live in FL I run 20w-50 Amsoil in my bike which is what was always used in my ZL 10. It came from a KAW Dealership in South FL. We used to call over reving floating the valves. Back in the 70s bikes had no rev limitter. You would feel a power drop. I was told that happens when the exhaust & intake valves try to open at the same time in return calling it floating the valves.
     
    Last edited: Feb 9, 2019
  15. slug

    slug Senior Member

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    Yes that horrible sound of lazy throttle control...! So it seems I hear it in every second burnout video on YouTube, but I can’t recall ever hearing limiting in a ZL one? So my question remains, has anyone ever actually heard/experienced a ZL limiting?
     
  16. furchin

    furchin ZL-OA Co-owner Staff Member Administrator Super Moderator Supporting Member

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    For some reason I seem to remember our founder, zlmark , hitting the rev limiter at the drag strip one year when we were attending the vintage motorcycle show in Ohio. Markus56, can you second that or not. I keep thinking it happened when he was running against Greg C.
     
  17. R. J.

    R. J. Supporting Member

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    :hello: I've heard the rev limiter hit on my ZL 10 more than once. It happens just under red line.
     
  18. paulfun

    paulfun "King Of The 1/4mi (Internally Stock)"

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    I used to peg the limiter on a regular basis back in the day.
     
  19. markus56

    markus56 ZL-OA Co-owner Staff Member Administrator Super Moderator Supporting Member

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    yes Furchin, ZLMark hit the limiter at Dragway 42 that year.
     
  20. paulfun

    paulfun "King Of The 1/4mi (Internally Stock)"

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    Not sure about the zl1 but the 9 wouldn’t hit the limiter till it was a good bit into the red. Sorry right now I just can’t remember exactly where it cut out.
     

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