Engine cuts out - BMW F800 Riders Forum & Registry



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  1. #1
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    Hi all. Here’s my first post and thanks for taking a look.
    I was returning from some backroads and trails today and was running down a major hwy when the engine just cut right off.
    I pulled onto the shoulder and it kicked in so I pulled back onto the hwy.
    it did this the last 30 minutes of my ride and I was vsry grateful to make it home.
    Ideas? Thanks!

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  3. #2
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    Haha. Its a 2012 F800gs

  4. #3
    Richard230's Avatar
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    Welcome to the forum, Bill. The first thing I would look for is a loose connection at the battery.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

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  6. #4
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    Interestingly it cuts out for 2 seconds then runs for about 8 seconds. If I don’t move the throttle it just repeats and feels like it bump starts each time.
    If I roll off the throttle the engine shuts down, not great on the hwy, and it fires back up with the Start button

  7. #5
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    Was it the same on the highway? Only when you were at idle speeds/closed throttle it cut out?
    BMW F800ST, 2010, Black, Fuzeblock, Sat Nav, BMW Tank Bag, Givi Touring Screen, Denali Spotlights, Denali CANSmart, Wunderlich Crash Bars, 55K Miles & counting 

  8. #6
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    It started on the hwy and kept it up through town too

  9. #7
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    It idles fine

  10. #8
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    What was your fuel level at? Seeing as you were off roading, there is potential that some crap/debris in the tank may have found its way from the bottom of the tank into the pump/fuel lines causing an issue.
    BMW F800ST, 2010, Black, Fuzeblock, Sat Nav, BMW Tank Bag, Givi Touring Screen, Denali Spotlights, Denali CANSmart, Wunderlich Crash Bars, 55K Miles & counting 

  11. #9
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    Quote Originally Posted by Bill Edwards View Post
    Interestingly it cuts out for 2 seconds then runs for about 8 seconds. If I don’t move the throttle it just repeats and feels like it bump starts each time.
    If I roll off the throttle the engine shuts down, not great on the hwy, and it fires back up with the Start button
    Did you just fuel up. It sounds like water in the fuel.
    Riding for the SON 

  12. #10
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    This is a long shot, but my 2009 F800 was surging and cutting out like it was having fueling issues while I was on an off road trip, and it turns out the cutoff switch for the kickstand had been damaged. The cutting out of the engine got worse and worse until it was unrideable. We ended up having to bypass the switch in order to keep the bike running. You might check that the switch didn't take a hit while you were riding. Best of luck getting it sorted. Ben

  13. #11
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    Do you have a Motoscan or a GS-911? I would start there because this feels more like an electrical issue to me. Especially since you said it idles fine, the idle hoses don't seem to be the cause.
    Since you said it happens only when you coast i.e. close off the throttle while in gear, I'm wondering if there's some sort of vacuum issue that's causing fuel flow problems. I remember reading some threads about similar issues due to the charcoal canister getting saturated, but this is a wild guess on my part, and I myself can't really explain what I mean exactly.
    I had an engine cut-off issue on mine a while ago, but once it cut out, it wouldn't fire back up until I cycled the ignition (turn off, wait a few seconds, turn back on). The issue was the fuel pump, which apparently does wear out due to the tank design and starts seizing, thereby tripping the electronic fuse.
    I spent a couple of months checking/swapping various parts when a fault-code scan could have revealed the problem instantly.

  14. #12
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    I recently had something similar. Turned out to be the right switch cluster had a connectivity issue. Any time I wiggled the cabling in to it either killed the ignition or enabled it. I took the cluster apart, cleaned and re-seated the connectors and reassembled. No problem since. Quickest way to see if its remotely similar is wiggle the cabling while the engine is idling and see if it cuts out.

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