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  1. #1

    SL 780 limp mode

    Hi, I did some reading and came accros the limp mode posts. Does limp mode on a SL780 affect all cylinders or just one ? It may just explain the misfire problem on the PTO cylinder. Thanks.


  2. #2
    Water Bum Rodneyae's Avatar
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    In limp mode all it dose is limit the RPM to about 4500 RPM. It dose not cut out cyclinders. As on the 780 all the coils fire at the same time.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Rodneyae View Post
    ...As on the 780 all the coils fire at the same time.
    They do?
    I thought that was only the case with the domestic twin cylinder motors...

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Fuji fire all 3 at same time. No limp won't limit only 1 cyl.

  5. #5
    Water Bum Rodneyae's Avatar
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    The Pro Cdi will fire cyclinders indvidualy but all the other fiji's fire all at the same time.

  6. #6
    Tony's Avatar
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    Fires all 3 at the same time? All three pistons aren't at TDC at the same time. What am I missing here?

  7. #7
    Hell Bent or Heaven Sent? Bent's Avatar
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    There is no problem if a cylinder fires 120 degrees early... as there won't have been any fuel pulled in from the crankcase yet, plus there is no real compression at that second so it's not gonna light anyways.

    The cylinder that is past TDC and fires when it's 120 degrees past the one providing the power will not have any fuel to light either, any thing in the cylinder will be burnt already.

  8. #8
    Tony's Avatar
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    Thank you Bent. That was an excellent explanation. I've been in the 4 stroke world all my life and I guess it shows.

  9. #9
    Hell Bent or Heaven Sent? Bent's Avatar
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    after reading my post I noticed some flaws, but it's apparent that I got my meaning across - which is good.


    AND,

    I wish I could join the four-stroke world too, but 'tis not to be....

  10. #10

    Firing sequence

    Hi, all three cylinders do fire at the same time, as I checked and the ignition coil primaries are all in series. I have since found that the ski is in limp mode and the rev limiting does affect the PTO cylinder on the SL780 more than the others, it in fact cuts it out at higher rpm. I took the cable off the plug to prove it and still got around 4200 RPM. This could be a useful easy diagnostic, other than removing the gray wire in the contol box. Regards.

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