F800R Not starting

Discussion in 'Road Warriors' started by kaptainsims, May 3, 2021.

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  1. kaptainsims

    kaptainsims n00b

    Joined:
    Apr 9, 2018
    Oddometer:
    5
    Location:
    NorthEast, USA
    Hey Everyone,
    I've got an issue with my bike, I've scoured forums, and tried things, but no joy.

    2012 F800R

    Last month I put my motocycle on charger and it charged up and started up with a bit of hessitation.
    I know the battery was bad, because it charged up in exactly 0 time, and it's been throwing out low voltage since last summer.
    Anyways weather warmed up and I charged it again before going out to work. It started up, I rode it to work, temperatures came down at the end of the day, and then it wouldn't start. Battery too low to even push start it.
    Tried charging it up for a couple of hours at work and still nothing.
    Got a jumpstart from someone, and it started, but as soon as I released the clamps, it died again. Then it wouldn't start again, but was giving me an immobilizer error.

    I ordered new battery, a week later, I threw it in the bike, and while it lit up, still giving me EWS error, and no go.

    I ordered a new ring antenna. Weird, that it would go at that exact moment, but I figured why not.
    It came in, I did the frankenstein detach and attach new one, and used both keys.
    It fired up and I got it home.

    Then the next day, I decided to replace the antenna. I took the front end apart. Drilled out the security bolts, and installed the new one.
    While doing this, I unfortunately broke 2 micro switches, which we're very deteriorated. It's the ones on the clutch and front brake levers.
    I ordered the switches, they came in. I put them on.
    Reconnected everything and when I put the key in it lights up, no errors, and cranks, and noooo joy.

    I have fuel in the tank.
    I checked and rechecked all the connections.
    When turning the key, the fuel control unit on the fuel pump itself, turns on, I can hear it when turning the key, and I checked the voltage when turning the key as well, just to be sure.
    I took off the airbox, checked sparkplugs, I'm getting a spark.
    I recheked the 2 microswitches, but those seemed fine, I removed them, and just had them hanging, and still nothing.
    I can't tell if it's a fuel issue. It seems like it's a fuel issue, but I can't be sure
    Battery is good to go, brand new Yuasa, holts charge, and shows 13volts, and something like 11 when cranking.
    I'm not sure which hose to disconnect to see if it's spraying fuel.
    I can't imagine it's clogged injectors.

    Anyone have any suggestions?
    I'm stumped,

    I also don't have a GS911, but I might be getting one soon. I'm not sure if it'll throw a code or anything.
    #1
  2. kaptainsims

    kaptainsims n00b

    Joined:
    Apr 9, 2018
    Oddometer:
    5
    Location:
    NorthEast, USA
    I didn't do it, but tomorrow I will check if I put a paper towel down the sparkplug hole, if it comes back up wet.
    #2
  3. Cogswell

    Cogswell Road General

    Joined:
    Jan 3, 2005
    Oddometer:
    11,749
    Location:
    Riding with my pal Richard Cranium
    Did you run the engine to full operating temperature the last couple of times it was started ?
    #3
  4. kaptainsims

    kaptainsims n00b

    Joined:
    Apr 9, 2018
    Oddometer:
    5
    Location:
    NorthEast, USA
    I did ride it home from work before I swapped the antenna, then it sat for a week before I swapped out the switches, so for a week or so it didn't run at all, but the last time it did, yes, it's about 10 miles or so.
    #4
  5. kickstandsup

    kickstandsup Devout Atheist Supporter

    Joined:
    Mar 21, 2013
    Oddometer:
    4,984
    Location:
    Kitty litter USA
    The clutch microswitch, if working properly, allows you to start the bike in gear with the clutch lever pulled in. Is that what you're trying to do? If yes, and it won't start that way, will it start with the clutch lever out and the bike in neutral? If yes, it is the microswitch (or the connections to it).

    The brake microswitch is simply for the lights, no effect on starting.

    I'm still betting on immobilizer/antenna or some combo thereof.
    #5
  6. kottomack

    kottomack blahblahblah...go ride Supporter

    Joined:
    May 11, 2011
    Oddometer:
    459
    Location:
    NH.....und amol in Mittelfranken..gell
    Bring the battery to full charge. I don’t think 11 volts it enough for everything to power up correctly.
    Good luck
    #6
  7. 863nMe

    863nMe Adventurer

    Joined:
    Mar 16, 2021
    Oddometer:
    10
    Location:
    PA, USA
    It is most likely the fuel pump. My 2009 F800st that I purchased used with 1200 miles had the same problems you described. My buddy and I wound up putting a Bosh fuel pump in the Bmw assembly. Before that a dealer wanted to charge quite a lot of money for the whole assembly and installation. The retrofitted pump worked reliably for many years.

    I am now considering the purchase of an R1250rt but worried about reliability. That Bmw didn't fix the known fuel pump problem on a similar bike six years after mine was manufactured makes me nervous about purchasing another one of their motorcycles. The intermittent failures I experienced with the F800st negatively affected my feelings toward that motorcycle even long after the problem was fixed.
    #7