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KTM 790 takes a few tries to start

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

  1. No-Fret

    No-Fret Tanker

    Joined:
    Jun 1, 2015
    Oddometer:
    912
    Location:
    Peoples Republik of Washington
    I had trouble starting my 790 after purchase, then threw a booster plug on it for a a few days to try it out but did'nt like the MPG loss, however it solved the starting issue. I took it off and went another 300 miles with it starting only after 3-4 tries.
    For some reason, around 500 mile mark it started firing up with one hit. I always let the pump cycle first.
  2. hcd

    hcd Adventurer

    Joined:
    Nov 8, 2019
    Oddometer:
    82
    Location:
    30161
    Yeah, mine seems to have cured itself.
    No-Fret likes this.
  3. EvilSteve

    EvilSteve Not so evil, not so Steve.

    Joined:
    Jun 30, 2008
    Oddometer:
    903
    Location:
    SoCal
    My bike was fine for ~3k miles then started having starting problems. Dealer reset the learning and then I had no problems for a week or so but the starting issues came back. (2020 model).
  4. BobcatSig

    BobcatSig They call me... Huckajawea

    Joined:
    Aug 15, 2014
    Oddometer:
    3,631
    Location:
    Protestlandia, OR
    Is your bike all stock? Any mods?
  5. EvilSteve

    EvilSteve Not so evil, not so Steve.

    Joined:
    Jun 30, 2008
    Oddometer:
    903
    Location:
    SoCal
    I have the power parts off road filter and UniFilter snorkel pre-filters. Still waiting for the Rottweiler airbox cover which will replace the snorkel situation. Otherwise it's stock from a motor perspective.
    BobcatSig likes this.
  6. Nobbster

    Nobbster Adventurer

    Joined:
    May 27, 2019
    Oddometer:
    15
    Location:
    Middle Tennessee
    I began experiencing the "cold start" issue about 300 miles in on a new 2020 790 ADV R. Didn't happen initially. Followed proper starting procedure, using high octane non-ethanol gas...etc.... Just took the bike in for first service and brake recall repair and explained the "cold start" issue to the KTM tech. He reset the "adaptation valves" and said that 90% of the time the reset corrects the problem. Since the reset, the bike starts first press of ignition every time.
    BobcatSig likes this.
  7. Dustycowboy

    Dustycowboy Cantine

    Joined:
    Jan 3, 2013
    Oddometer:
    40
    Location:
    Canada
    I'm taking my bike to the dealer in about a week and have the cold start issue too. Do you have more info on the "adaptation valves" thing? A quick google search didn't yeild anything about that...
  8. marchyman

    marchyman barely informed Supporter

    Joined:
    Jun 30, 2005
    Oddometer:
    14,565
    Location:
    SF Bay Area
    I think that was a typo, or perhaps a hear-o. Adaptation values. The bike learns as you ride. Sometimes it learns the wrong stuff and takes a while to slowly adjust to current reality. Resetting the adaptation (learned) values to factory defaults can speed up the re-learning process. But the bike may not run as well as before the reset until the adapted values stabilize.
    TrailTrauma likes this.
  9. Dustycowboy

    Dustycowboy Cantine

    Joined:
    Jan 3, 2013
    Oddometer:
    40
    Location:
    Canada
    It makes sense! Thanks for your help. I can't wait to see what the dealer will have to say. The problem seems to be getting worse every week. The bike started just fine in may when I bought it, then in june it began to die every now and then unpon cold start up. Now it's almost every cold start.
  10. RWJorg

    RWJorg Been here awhile

    Joined:
    Aug 9, 2019
    Oddometer:
    188
    Location:
    Houston, TX
    I went with the booster plug and it solved that issue.
  11. Dustycowboy

    Dustycowboy Cantine

    Joined:
    Jan 3, 2013
    Oddometer:
    40
    Location:
    Canada
    Yeah... I red somewhere it could solve the problem. Personnaly, I'd prefer that my bike runs correctly by itself before modding it.
  12. RWJorg

    RWJorg Been here awhile

    Joined:
    Aug 9, 2019
    Oddometer:
    188
    Location:
    Houston, TX
    I hear ya. It was plug-n-play and solved my issue. Ha.

    Reading previous posts, not sure where they'd find the "values" - software reset ?
  13. Dustycowboy

    Dustycowboy Cantine

    Joined:
    Jan 3, 2013
    Oddometer:
    40
    Location:
    Canada
    Probably! Not something someone can do by himself, in his own garage, with his own tools. That, I really don't like.
  14. Foogie

    Foogie Adventurer

    Joined:
    Jan 2, 2020
    Oddometer:
    20
    Location:
    New jersey
    My bike is hard to start when it's hot outside with the engine cold, when it's cold outside the ecu will make the mixture rich and it's starts the first time. It's been starting first time, every time until it got hot out, but it's still doing better than when it was new.
    Dustycowboy likes this.
  15. marchyman

    marchyman barely informed Supporter

    Joined:
    Jun 30, 2005
    Oddometer:
    14,565
    Location:
    SF Bay Area
    It may take special KTM software or maybe an off the shelf OBD II device with appropriate software can do the job. I had a third party diagnostics tool for my last bike, a beemer. It let me do things like reset adaptation values, exercise the ABSm, etc. I haven't played with the 790 OBD II interface so am not sure what, if anything, it can do.

    As for the subject of this thread... my "took a few tries to start" issues went away on their own. I suspect the bike adapted. I think it took 3 or 4 K miles. At some point I realized it had been quite a while since it took a second push of the starter to get the bike going.
    Dustycowboy likes this.
  16. Some_Dude

    Some_Dude Been here awhile

    Joined:
    Jun 23, 2019
    Oddometer:
    806
    Location:
    Thunder Bay
    Are the adaptive values store in volatile memory (aka, are they reset when the battery is disconnected)?

    Like others, last year I had issues with it taking two to three starts when cold (initially, I was holding the starter down as I didn’t realize it just needed a quick push, and then I was flicking it from kill to start without letting the fuel pump prime).

    This year, after having the battery pulled and stored inside wall winter, I haven’t had a single issue.
  17. Tool.Nerd

    Tool.Nerd An idiot that owns a bike

    Joined:
    Jan 10, 2016
    Oddometer:
    594
    Location:
    Southeast TN
    Mine continued to have to cold start issue through 14k miles. Several resets of the adaptation, multiple weeks left at dealer on multiple occasions, eventually got sick of 2-3 tries and did the booster plug. By that point, I had to. It's a great bike and I love every part of it but the unreliability of the starting was scaring me.
    Dustycowboy and No-Fret like this.
  18. kubcat

    kubcat Riding is Eudaemonic Supporter

    Joined:
    Sep 22, 2016
    Oddometer:
    1,930
    Location:
    Upstate NY
    Fact is they start reliably. It may take a few presses on the button, but no one has said every now and then it just stalls each time, so I couldn't get it running. It will start every time you need it to.
    Dustycowboy likes this.
  19. Tool.Nerd

    Tool.Nerd An idiot that owns a bike

    Joined:
    Jan 10, 2016
    Oddometer:
    594
    Location:
    Southeast TN
    About once every 2-3k miles, I stall the bike in traffic. More frequently if I've been riding the other bike recently. Brag all you want about how it starts every time on every third time, but for idiots like me, that won't work.

    It'd be different if it was just a cold start issue.

    Go ahead and tell me I don't know how to ride. I'll be the first to admit I'm a klutz at everything.
  20. kubcat

    kubcat Riding is Eudaemonic Supporter

    Joined:
    Sep 22, 2016
    Oddometer:
    1,930
    Location:
    Upstate NY
    I think you're the first I've heard of that won't start when the engine is warm (i.e. stalling while riding). That is a different story. There may be more to it than the typical 3 tries to start in the morning most (including me) have experienced...