Archive of BMW Motorrad Club Cape (2006 - 2019)

Hi Anton

1. The throttle thing to reset the ECU does not work for single-cylinders - it is to recalibrate the throttle-body position sensor on the boxer motor.
2. The problem may be one of the sensors or wires to the sensors (I'm thinking exhaust temp, air temp or whatever).  Most likely you would have to send the bike to a dealer or one of our other excellent mechanics (Kingtek or JKWorks say).  Or (and this would be also be a schlep) replace each sensor with a working one and see if it makes a difference.
3. Otherwise, it might well be the fuel filter.  After standing a while the fuel trickles through the blocked filter slowly, and when you start there is enough to run a short while in the pipes and injector, but the filter does not let the fuel through fast enough and the engine gets starved.  Replace the filter and see.

Hi Charles, thanks for the reply.

I finally cracked the mystery this morning, and maybe you will believe it, but I could not.

After removing the throttle body once more and removing throttle valve switch, I noticed that the angle of the throttle when it is closed and the angle of the valve when it is closed, are not the same. Checking the throttle body, I noticed that the small screw, almost like a idling screw, was preventing the throttle from closing shut completely.  After turning the small screw to the outer position, hitting start, and the GS purrs like a kitten.  

Thanks for your advice, I do think I will change the filter anyway.

Anton

Correct me if I'm wrong, but I think, same as my bike (just plain 2001 F650GS), the fuel filter forms one unit with the fuel pressure regulator / pump, i.e. you cannot just replace the fuel filter, but have to replace the whole unit (quite pricey). It was just short of R 2,000 two years ago. But look around on the forums. There's a work-around to this by using non-BMW bits.

Hey,

I recently had the same problem, as well as some occasional acceleration hesitation.

Anyway all my problems sorted now after removing, cleaning and re-spacing the spark plug, I watched a youtube guide about cleaning and re-spacing spark plugs correctly first.

I also very slightly adjusted the clutch using this guide http://faq.f650.com/FAQs/ClutchAdjustmentFAQ.htm, it shows very nicely how to do it right.

Then a little fiddling with the throttle and it now runs smoothly again. I couldn't find a really nice guide about the throttle anywhere still looking for one.

Here is extra info on the F650 spark plugs http://faq.f650.com/FAQs/SparkPlugFAQ.htm

Good morning Friends,

I am a newbie here, so thank you for the opportunity.

I also experience a strange problem this weekend on my 2005 Dakkie.

It was with Sovereign BMW for a major service last week and was brought all the way up to Gauteng for the trip to Limpopo.

The bike pulls like a rocket but just before Modimolle (Nylstroom) it was cutting out, then go again, cutting out, then go again while on the run.

Same when I came home to Boksburg, running like a bullet, then near Boksburg, about 230 kays later start doing the same thing.

I am puzzled because the idling is perfect.

Is this petrol or electrical?

Your advice will help me a lot!

I had strange "hesitation/cutting out" issues (never completely died while riding), but perfect idling. It turned out, after months of trouble-shooting, to be a faulty throttle position sensor.

All annoying, intermittent hard-to-resolve issues were always related to damn sensors in my case (other one was the temperature sensor - not to be confused with the thermostat).