09 BMW R1200R stalling at low RPMs/Idle

[rhun]

I'm having some issues with my 09 R1200R (21k miles). It usually starts up fine and then the idle sounds a bit 'weak' (the needle will keep jumping up and down at the bottom of the rev counter as if its trying not to stall) and then after a minute or so it will stall. Once it does this it will refuse to idle and I'll have to twist the throttle to get it to start and then hold it open to get it to idle but it's very rough. When I'm riding it has a tendency to stall at low RPM's constantly and it will also run like a dog, the indicated MPG will drop down into the 20's. Sometimes it seems to run fine and idle however I think it's getting worse and much more common for it to stall at low RPMs. Yesterday it started kangaroo hopping like mad however I think that may be down to some shoddy fuel that I filled my tank up with in some tiny obscure petrol station in the highlands (live and learn). I don't know if this is relevent but it seemed to be running fine for 400 miles and then I got caught in a seriously heavy downpour in Glencoe and ever since then this has been happening. If anyone has any good ideas that I can try at home I'd be very appreciative. As due to the age of the bike taking it into BMW is a last resort.

Service history shows a full and comprehensive service 5k mile ago.

Cheers
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Honda CBR600F6

[Rogerborg]

My knee jerk would be coils / HT leads / plug caps, but since it's starting then spazzing, my head says some sensor, either oxygen sensor in the exhaust or throttle position sensor. I'd hit it with a can of WD40 before trying anything clever.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[rhun]

I've uploaded a video here to show the issue I'm having. It idles fine (I think) when it's cold, its when it warms up and I assume the automatic choke makes changes to the fuel mixture where it starts to experience problems. As you see at the end of the video I blip the throttle a bit to show what happens when I'm riding it and then it will be unable to start without throttle. It's clear from the video that the engine isn't running right as you can hear it misfiring or something similar to that. Please let me know if anyone can hear anything obvious that I'm missing. I'm new at all this. (my old 2002 cbr600f never had any issues )

https://www.youtube.com/watch?v=oqWmoOLW5DE
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Honda CBR600F6

[Oldie]

Erratic rev counter is very often a symptom of a knackered Hall Sensor.

There's plenty of info on the ukgser forum to help you. Most people, including myself, end up buying a second hand unit off ebay but, even then, they're not cheap.

[rhun]

[Oldie]

Sounds very much like it's firing on one cyclinder most of the time. After starting from cold do a quick check to see which exhaust pipe is heating quicker to determine if there is a difference.

If you can identify that one cylinder is not firing properly then you can start a proper diagnosis. I haven't worked on hexheads but, yes, a simple idea would be to swap the coils over to test them. However, I'd put in new plugs before I did anything. Also, inspect the wiring below the rubber boot of the connector to the injector on the "faulty side". These hidden wires can split leading to intermittent power to the injector. Or maybe it's the HT lead or plug cap - start the bike and spray WD40 onto them to see if that improves running.

As I said, the ukgser forum will have many similar stories and solutions.

[BTTD]

Are the throttle bodies properly balanced? I've had lumpy low revs on out of balance, but not stalling.

[rhun]

[Old Git Racing]

Forget wd40, go get some proper contact cleaner from somewhere like Maplins and take every connector apart and clean them, along with HT leads and plug caps. I'd also dump the fuel and refill with new stuff. Won't be a coincidence it started doing it after the rain/fuel.

OGR.
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2022 Tiger Sport 660 2019 Street Twin 2003 K3 gixxer 1000 1998 Srad 600 track hack

[Oldie]

Mmmmm, thinking that it might be your fuel pump or FPC. Certainly worth investigating further. The R1200R has a tendency to allow water to gather around the fuel filler cap and you may have suffered from water ingress during your Glencoe ride. Many owners fit an Abdeckring (I did) which seals the filler cap and you can get them off ebay.de.

If it's not the pump itself, it's probably the fuel pump controller. The part number for the 1200GS is 16147720776 and I guess that it's the same for the R, but you could check online - https://www.realoem.com/bmw/select.do?kind=M&arch=0

The basic rule for the FPC is Black = good, Silver = bad. Most 1200's had a recall but maybe not yours?

If you're handy, there's a bypass of the FPC which you can do, but we'll leave that for later

[rhun]

My bike so now with BMW. Hopefully it won't cost me too much. Missing my cbr600 right about now.
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Honda CBR600F6

[Rogerborg]

[rhun]

[Rogerborg]

Douglas Park Motorrad, by any chance?

I'll be interested to hear how that turns out.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[rhun]

[Oldie]

They're mostly fine. Needed them 3 times - always happy with the result.

[Rogerborg]

[rhun]

[rhun]

I received a call today, it is the Throttle Position Sensor as has been mentioned a few times. Quite relieved it isn't a big job.
____________________
Honda CBR600F6

[Rogerborg]

Ah, good news.

Is it a cheap job though? Honestly, I have no idea what dealer costs are like on BMWs.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[rhun]

[Rogerborg]

That actually sounds reasonable enough, although a GS-911 is first on my list if (when) my midi-Tractor starts acting up.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[rhun]

[Oldie]

I've got one with 7 slots left - happy to share.

[rhun]