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Old 07-15-2014, 02:34 PM   #1
Umarth OP
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Location: Tramping arround the world for a bit with Big O
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Question F650GS (single) not starting...

Hullo all,

I know just about nothing about this bike (not mine) but looks like I'm stuck with fixing it (keeps the girl friend happy).

the bike is a BMW F650GS circa 2000 with FI. Bike only has 30k km (18k miles). Spent it's life in the city. Maintenance history is unknown.

Here is the situation:
- bike quit 50m after fuelling up on premium. (reputable gas station, not some Argentinian cross roads crap)
- refused to start back up. ended up towing it to my place.
- At which time it started.
- later that day, started again but ran for a few seconds then died. Did not start up again that day.
- Next day, same behaviour.
- then the next day: cranks but does not even give a hint of wanting to catch and start up.

Things I've checked:
- there is spark and it looks good..
- when turning the key on, I hear the fuel pump priming.
- battery has been changed, topped off a few times on the charger.
- tried another battery. Did not try a car battery...
- used the odd starting procedure that people here say must be followed: turn key on, wait for all the dash lights to turn off then press start button with out touching the throttle and don't let go before the engine is running fully. (odd crap that)
- drained some gas out of the tank to make sure there was not to much gas (I know, me to: was pointed out as a potential vapor lock for the fuel pump. :/ )
- checked air filter: it nice and clean.
- no obvious frayed wires but this bike is such a bitch that can't see much without taking everything apart...
- The one time I got it to start, I checked the voltage and it was 14.x volts.

I've ordered a new fuel filter/fuel regulator, a new injector and ignition coil. Almost ordered a new fuel pump but at 400$, f*#^ that. I don't like throwing new parts at a bike half-blindly but I figure the injectors are probably half-clogged with bad gas from siting out all those winters, lots of people pointing to the coil so why not (got a deal on it) and the filter is due for replacement anyway.

one thing I did notice is that when I press the start button for a few seconds (say 4-5), right after releasing it, I here a gurgling noise like when you drink pop with ice through a straw.

I don't have a leak down tester so can't tell if it's a compression problem.

So, assuming that the new parts don't fix it, any of you degenerates have a clue as why this thing won't start? Any and all suggestions as to what to look for/at and when applicable how to tell if a given component is toast, is more than welcome: it's down right solicited!

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Old 07-15-2014, 04:40 PM   #2
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Joined: Jan 2006
Location: Ridgefield, WA
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Maybe your vent line from the tank is kinked, etc. The gurgling makes me think of that. Try to start with the gas cap off

Does that bike have a charcoal canister? Seems like I've heard if the canister gets schmeg in it they have a hard time starting.
colonel angus sez, "sometimes you just gotta superman that ho"
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Old 07-15-2014, 05:35 PM   #3
Full Power
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Location: Homer, Alaska
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What'd the spark plug look like ?

Fuel pump should cost about 45 bucks from Amazon.
Get a spark plug same time, probably ship free.
Warm enough to RAIN is warm enough to RIDE.
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Old 07-15-2014, 07:09 PM   #4
Umarth OP
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45??? You got a link???
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Old 07-22-2014, 08:11 PM   #5
Umarth OP
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So then,

I replaced the spark plug, fuel filter and injector.

Result: bike started up on second turn of the engine! Houra I thought!

Well not quite, as soon as it warms up a bit it can't idle and dies quite quickly. Restarting it works but will not be dle and dies. Leave it sitting for a bit and you can get it to idle again until it warms...

So, any idea what this could be? I ordered a leak down tester to check that but if its good, I have no idea what else to check.

Is there some sort of egr on this thing? Could it be that it's working fine when cold because it running without sensor input but when opp temp is reached and it enters 'closed loop' mode if stalls due to a bad sensor? If so, how does one diagnosis that?

Got but I'm quickly developing a hatred of FI... I, who hated my carb not so long ago... Lol

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Old 07-23-2014, 04:42 PM   #6
Umarth OP
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Wow! The responses are overwhelming! lol

Thank I didn't take one on my last trip! hahahaha
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Old 07-26-2014, 10:47 PM   #7
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Location: Sydney, Australia
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Firstly the start procedure you think is weird is correct and applies to many modern FI machines, it is to do with FI startup

The optimum is to look with diagnostics like a GS911 to see if there are any faults in the BMSC memory

As for the fault, there are a few common faults which could cause it

1/ A faulty idle actuator and or dirt in the air passages to it, clean it and refit
2/ Broken diodes / connections on the starter lock out system, these are in the bottom of the electrical box
3/ Faulty side stand switch, they are known to get intermittent connections, you can use a wire loop to isolate it
4/ Wire chafing, check at the shock preload adjuster and steering head
5/ Ignition Switch, the wiring there can get pinched and break, some switches are poorly routed and the wiring stretches and breaks
6/ Kill switch, poor connections there have been known to give the fault you describe

Much of the info you need is over at in FAQ or the threads, other info is on the web site in my signature
650GS Info -
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