KTM 790 takes a few tries to start

Discussion in 'Parallel World (790/890)' started by doctorblanco, Sep 10, 2019.

  1. Billyj7175

    Billyj7175 Been here awhile

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    I sprang for the BP...still has the 3-4 times on the startup before it stays running. However, the idle is more consistent (it used to rev high, then low, then high during warm up) and definitely feels more responsive right around the 4k range, where it always felt a tad lazy. I'll ride it for a while then decide on whether or not to go with the PCV + airbox.

    Btw, I'm running the powerplate, Akro slipon w/no insert and no cat.
    TrailTrauma likes this.
  2. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

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    I assume that if you have a PC V with one of Rottweiler’s maps on it, it’s a one-press start?
  3. 1coolbanana

    1coolbanana Long timer

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    Ive not actually heard this claim anywhere, its a crap shoot I reckon.
    Wonder if it actually helps or not.
    Not enough of a problem to spend $1000 (au) on, not to me anyway.
  4. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

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    Well, yeah, of course not. But if they can't get a one-push start with the freedom to adjust the AFR and ignition timing, we sure as hell aren't going to fix it with the various good luck charms and hexes discussed here!
    lithodave likes this.
  5. braaap!

    braaap! Long timer Supporter

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    I just bought 2 fresh sardines (for slapping together) and a rabbits foot... Black cat is in the washing machine...

    :lol3

    Back in the day, I remember watching grey haired old blokes kicking and kicking and swearing... 'Start ya F'ing bastard!'

    2, 3, 4 button presses... A first world problem I can live with.
    Seriously, next ride I'm gonna repeat my previous ritual and see if it works again :)
    1coolbanana likes this.
  6. 1coolbanana

    1coolbanana Long timer

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    I didnt think ignition mapping was an option for PC V?
    Is it now?

    From the EFI that I tune on cars, the startup sequence is independent of the rest of the mapping so PC V and RP maps may not address this stuff at all.
    All the startup sequence parameters are a separate entity that operate only during initial fire up sequence and handfull of crank revs.
    braaap! likes this.
  7. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

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    But again, you’d think they could also mess with that. Let’s hear from our PC V users! One press or more?
  8. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

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    I thought that was one of differences with the PC V vs the euro one that several people here are using; PCV can adjust timing. Hopefully someone smart will be along soon to let us know.
  9. chevmekanik

    chevmekanik Been here awhile Supporter

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    I would settle for someone educated!
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  10. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

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    That’s because they weren’t clever enough to lean the bike over far enough until the carb(s) flooded and trickled out of their overflow tubes, then straighten her up for a one-kick start.
    braaap! likes this.
  11. 1coolbanana

    1coolbanana Long timer

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    Perhaps like yourself?
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  12. Salzig

    Salzig Long timer

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    @WI-790R I've been down the rabbit hole of trying to find the female connector for the IAT, and it appears that Honda uses the same connector on some cars.
    Also found there's some kits to delete/fool the IAT.
    If you search for "2 Pin Female and Male ECT IAT IAC FAN Knock Car connector 6189-0156 Coolant Sensor Connector for Honda" it seams that a female connector indded exists.
  13. chrisssInStockholm

    chrisssInStockholm Adventurer

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    PCV can adjust timing for the 790/890
    I´m not sure PCV´s for other motorcycles can though.

    Adjusting ignition is important for both power and efficiency.
    More power less fuel consumption possible.

    Rottweiler offers both moderate timing and advanced, more aggressive timing.


    Available maps from Rottweiler:
    IG-Only.PNG

    Street.PNG

    Race.PNG

    Stacks.PNG
    1coolbanana and SoilSampleDave like this.
  14. WI-790R

    WI-790R Been here awhile

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    Thanks for the search suggestion. Yes, there are a number of places to find the female connector. It’s the male side that apparently isn’t produced (like is molded into the IAT sensor).
  15. brianbrannon

    brianbrannon They'll ride up with wear

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    PCV and RapidBike EVO can adjust fuel and ignition timing and can adjust both at at start up because it is installed between the injectors and coils
  16. Salzig

    Salzig Long timer

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    DOH! I wrote female but I meant male! I never seem to get if the gender is about the shell or the contacts...
    Anyway both connectors exist (BoosterPlug must have found them somewhere)

    [​IMG]
  17. gar

    gar Adventurer Supporter

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    This is my cold start procedure after my 790 started to take four starts to run. Since using this procedure my bike starts one push of the starter button every time without fail.
    1. Turn key on, let the fuel pump and dash run their cycle.
    2. Push the kill switch on, the dash light will come on in yellow saying "Kill Switch"
    3. Push the starter button to start the bike, do not stop at the middle position go right from "Kill Switch" to start.
    Works every time for my bike
  18. WI-790R

    WI-790R Been here awhile

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    Well that’s interesting! Were there any part numbers listed? I was beginning to think BoosterPlug had a male connector custom molded.
  19. WI-790R

    WI-790R Been here awhile

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    If that works for you, it makes me think it’s a firmware bug or something to that effect. Everyone with the starting problem should try your routine.
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  20. Marcham

    Marcham Been here awhile

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    Update... I'm back to 1 push starts. Haven't changed fuel or temperature.


    Shutdown routine:

    Kill switch off, back to on then key off.


    Startup:

    Key on, then without delay quick press of the starter....



    This is ridiculous....
    lithodave likes this.