G650GS won't start

Discussion in 'Thumpers' started by ODogs, Mar 6, 2013.

  1. ODogs

    ODogs Adventurer

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    My son's low mileage '10 G650GS has been in the garage since October . I've been starting it every 2-3 weeks without issue and letting it run for 5-10 minutes. This morning it cranked, but wouldn't fire. It does have gas.
    Any thoughts why out-of-the-blue it wouldn't start? :dunno

    Thanks
    btw, apologies if I posted in the wrong sub-forum. Just direct me please.
    #1
  2. epicxcrider

    epicxcrider Been here awhile

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    You made sure the kickstand was up, right?
    #2
  3. ODogs

    ODogs Adventurer

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    Yes, the bike is up on the center stand. (thank god, cause that would have been an embarrassment :) Basically the same spot it's been for 5 months.

    Other ideas?
    #3
  4. Nickcamera

    Nickcamera Adventurer

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    is it in Neutral?
    also, maybe the battery went dead? I don't think letting it run for just a minutes at a time is enough time to juice it up.
    #4
  5. epicxcrider

    epicxcrider Been here awhile

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    Haha I've done it
    #5
  6. henrymartin

    henrymartin Mr. Tourguide

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    5-10 min at idle is not enough to warm the oil and evaporate water, just FYI.
    You need to run it a bit longer, or drive around a little.

    If you have a stock battery, it could be dead. Mine did that. I bought a new one at Autozone, Extreme Magna 220 CCA, and I have not touched the battery for the past three years - no charger at all. Bike sits 3-4 months each winter, and cranks like new. I just started mine last week.

    Check for connection in your killswitch, and rock it back and forth a few times. Could have oxidized just sitting in a damp garage. Same for the starter switch. Mine did that after I rode through water up to handlebars :lol3 and was very finicky when it worked. A little cleaning did the trick.
    #6
  7. ODogs

    ODogs Adventurer

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    It was cranking over like crazy -just not starting. The neutral light is on, toggled the kill switch a couple of times, still just cranking without starting.
    As I mentioned earlier, this is out-of-the-blue. It's been starting all winter every couple of weeks. Now this time, nada. Just turns over, fairly fast, just won't catch.
    #7
  8. jigmoore

    jigmoore Adventurer

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    you said it cranked....don't know why people are focusing on battery.

    probably flooded. crank with throttle wide open maybe?

    is there a fuel petcock? make sure that's on of course.

    or maybe it's not cranking fast enough to get going....you could jump it with cables off a car battery to check that.
    #8
  9. Ditch

    Ditch Long timer

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    Don't touch the throttle while cranking. Turn the key on, wait for the lights to cycle and ONLY push the starter button.

    Possibly gas gone bad? These usually run on about anything though.
    #9
  10. henrymartin

    henrymartin Mr. Tourguide

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    Battery because: The EFI needs a certain charge to actually work. Just because it cranks doesn't mean it has enough juice. Even old Hondas with carbs had that issue.

    Petcock - no, its EFI

    Open throttle - NO! The ECU checks throttle position at start, and assumes that is the idle position. Even with 1/8 throttle open, the ECU will screw things up, causing the bike to stall later on, when you let go off the gas, and the whole thing starts again.

    If it cranks well,. and you have enough juice in the battery, check your fuses. Do you hear the fuel pump pressurize when you toggle the killswitch?

    Proper procedure is to turn the key on, wait until; all the flashing lights stop flashing (except the ABS), hit starter without touching throttle.

    Did you condition your fuel with stabilizer? If not, the pump could suck in water as ethanol separates from fuel. Water being heavier, would go closer to pump intake.

    Check the usual - spark, fuel, air. Since you haven't touched it in a while, you could have mice in your airbox, clogged fuel line (unlikely), bad gas, or corroded connection somewhere.

    Just grab a spare sparkplug, plug it in and push it against case to see if you have spark. If so, proceed to check the next thing.

    If you have both fuel pressure and spark, you can spray some starter fluid in your snorkle.

    I would also wiggle the shifter a few times, just in case the neutral switch is not fully engaged.

    More likely than not, it's something really simple.
    #10
  11. ODogs

    ODogs Adventurer

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    OK Problem solved! After cranking it over quite a few times, the battery was starting to go down. I eventually had to put it on the battery tender for a couple hours. Once it read 13.7v with the VM it started right up. My conclusion is that it was slightly low to begin with, maybe 10-11 volts; enough to turn it over -for what seemed to be fast enough, but not enough for the ECU to be happy with.
    It's a bit puzzling the ECU would 'require' full voltage (or nearly) in order to start. If I was traveling and had a low battery after, maybe a very cold night camping, I would hope it would start -if it turned over fairly quickly.

    Thank you to everyone that provided help. This forum is great. Now, if it would only stop snowing and warm up enough to ride!
    #11
  12. JRWooden

    JRWooden Long timer

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    On the BMW twins (probably the thumper also) the computer intentionally runs the injectors at a reduced voltage ... so if the battery was only at (say) 11, then the injectors might only be getting 9.5V which is not enough to fully actuate them ...

    One of the resident experts here Joel Wisman clued us in to that "feature" :lol3
    #12
  13. divimon2000

    divimon2000 Been here awhile

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    as a previous poster said, you need to ride it, not idle it- idling it is worse than not starting it. Moisture does not get heated out of the oil and the battery only gets lower. Get a battery tender tm. They need the voltage for the BMS as you now know.
    #13
  14. henrymartin

    henrymartin Mr. Tourguide

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    I don;t know if yours has the BMW accessory plug on the right side of the frame. Mine (an 09) does. The stealerships sell a charger plug that plugs right in there for "trickle charge" only. You cannot run a full blown charger through it, but you can set it at low amp charge. This way, there is no need to remove the panels to access the battery.

    Or, just ditch the stock crappy one, and buy yourself a decent AGM with very low self-discharge rate.
    #14
  15. muratokay

    muratokay Adventurer

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    Hello everyone,
    It has been a month since I bought my new Sertao and I've been using it without any problems so far.
    Today when I wanted to start it, it cranked, fired a bit but could not stabilize itself on the idle. I had to open the throttle to get the engine going and when I released the throttle the engine dies straight away. I mean it is like the engine can not stabilize itself on the idle if I don't open the throttle. The weather was not so cold as it was like 20 C outside.

    So I ran the engine by opening the throttle a little for about a minute or two and let it die afterwards. Then I tried to start it again without opening the throttle and this time it worked as it should.
    This is my first big bike, I had a Yamaha WR125R before and never had problems with starting. It feels bad when you experience something like this with a BMW bike.
    What could be the reason and most importantly can it cause any problems to me in the future?
    #15
  16. Warin

    Warin Retired

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    Read and understand from post #10 on page 1

    #16
  17. dazz

    dazz Been here awhile

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    To repeat: Don't touch the throttle!!! Turn the key on and only after the lights cycle, push the button. Simple.

    #17
  18. dazz

    dazz Been here awhile

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    Also your original battery is getting old. It is probably the flooded lead acid type. Check the water lately? If you put your tester on the battery while you crank you will need at least 10 volts while cranking. Maybe more.

    A lot of people change out that battery for the glass mat type.

    #18