Throttle back of to stall problem

fezzer

fezzer

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Evening all, hope you had a nice weekend.
I hope someone here may be able to help with my issue this evening.
I have fortunately just arrived in Caceres, Spain. The tour through Spain has been great so far.
So after a pretty long haul for me down the motorway this evening (2 hrs at about 70-80 mph, 5500 rpm) just as I took the turnoff for my overnight stay the throttle backed off of its own.
I have crawled into Caceres playing the clutch and restarting when required.
I'm cooling off with a beer, I hope my bike is also cooling down.
I have a tooth less on the forward sprocket, a sol be fitted and I saw a air temp of 40c just before the problem.
Looks like closest motorad is Madrid, I'm opposite an industrial estate with BMW but I think it's just cars.
So, heat, fuel, where to start? I have a few tools.
Any advise this evening much appreciated.
cf
 
Hi Fezzer, I had a similar problem two years ago, riding in 43 Deg, in central Spain. Turned out to be a straight forward fix for mine. Check the multi pin plugs that plug into the Controller under the seat, the heat had softened the rubber mounts and allowed mine to start to pull out, symptoms were engine during whilst increasing throttle.
I just pushed the connectors fully home and secured with good old electricians tape Hope this helps


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Which way you heading next? I'm in Chaves, North Portugal, for next day or two, with my good lady and a GS911 diagnostic tool if your still having issues


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Morning, I'm heading South, I came through the Chaves 2 days ago, found some nice roads along the border towards Salamanca. Thanks for the offer and will keep in mind. Just about to go start checking for any obvious loose connections now. Do you know if the closest Mottorad is Madrid?
Worth checking anything else that's easy access whilst I'm looking?
Thanks
 
So all looks good, a good stare always helps, sol be accelerator module removed. Bike run up and down the slip road here no problems. Heading for mottorrad at Badajoz to let them have a look.
Can only think trying to fool a bikes it's 20c less than reality might be a problem when it's really 40! Felt like it was being starved of something important.
Have roadside recovery if the bike doesn't make it itself.
Loading up moving on. Will let you know what BMW say.
Thanks. cf
 
Diagnosed as fuel pump problem. Found a man in Caceres. Heading for Seville, slowly.
 
Had this problem on an F 800 st. Mainly only occurs when weather is warmer. BMW checked and could find no fault code on the diagnostic machine.


They suggested air inlet hoses to the fuel system collapsed under vaccum or slightly kinked. When you get the chance check a site called F800 forum, makes interested reading on this subject.
 
In Seville outside the service station, nearest fuel pump 10 days away! Hoping it was just a random fault caused by extreme temperature. Bikes just run 3 hrs at motorway speed no problem. Only difference today is 10c less air temp. We see what they diagnose. Not pleasant on the motorway given in the back of mind you might lose all forward motion at any given minute.
Fingers crossed
 
Hi Fezzer
Saw your comments on the Accelerator thread - agree that it is possible the sol be that does not work so well in high temps ( or screws things up), but also what was your fuel level in tank when it first started eg under a quarter? Many possible mods for this on the 800 forum, but the anti-tilt device is an easy one to remove.
Hope the rest of your ride is trouble free.
Brian
 
http://www.tripadvisor.com/MobileVi...ja-Seville_Province_of_Seville_Andalucia.html

Not often you can ask for a stadium view when you check in! Sorry adding link wouldn't work.
What a great hotel, cheap, massive room, easy parking, I feel like a Russian oligarch looking out of my window tonight.
So maybe typically the Spanish service technicians had decided 1400 was enough work for the day and I'm back in the morning to plug in.
A kind English speaking gentleman explained that after hearing my conversation he said they really don't care much for your BMW in Seville. He had sold his because of this,10 days to get a part from Barcelona?? Only one in the country? I doubt it.
Fingers crossed the computer says nothing and I crack on South. Always wondered how I would make this transit through the flatland of Spain. Fate decided keep it on the motorway. Off to check some f800 forums and draw some more knowledge on this topic.
Bed after maybe one more cerveza.
Thanks for you comments I'll update what I'm told tomorrow.
cf
 
Sorry Brian missed your point. I've been fuelling when the first big bar drops, I've been some random spots and like to keep good reserve. Therefore tank not less than half. I've felt it back off before under hard acceleration when computer says 35miles to run but it wasn't relentless like this.
 
As hoped computer says sin problema, gonna leave the sol be off for now. No charge for diagnostics, thanks Seville, as ever the actual technicians are great at explaining possible causes. Heading South.
 
So it happened again. Not such a convient spot this time. I was about 200m vertical from making a 2000m pass, no phone signal. After about 6 restarts I managed to crawl over the top and start descending. Temp was 23c. So altitude sickness this time? Air density?
Power seemed to come back after running at idle speeds, dropping a few hundred meters. Fuelled carried on, the bike did another 100k to destination without fault.
Strange problem. Hope not to see it again.
 
fezzer said:
So it happened again. Not such a convient spot this time. I was about 200m vertical from making a 2000m pass, no phone signal. After about 6 restarts I managed to crawl over the top and start descending. Temp was 23c. So altitude sickness this time? Air density?
Power seemed to come back after running at idle speeds, dropping a few hundred meters. Fuelled carried on, the bike did another 100k to destination without fault.
Strange problem. Hope not to see it again.
Click to expand...

Well, from this description my view is that it does look as though there is a partial vacuum forming in you tank, related to either the poxy tip-over valve, or the little ball device fitted further on in the same tube.
Suggest you remove seat, put your hand in at the tail end and see if you can just rip out the breather tube, fixed with two plastic inserts to the subframe, then see if that little aluminium section containing the ball has any dust in it? Try replace it the other way round, it has a direction arrow on the body.
HTH
Brian
 
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At side of motorway hiding under bridge, not good. Found breather pipe, tippy switch all looks good and operational. Should the little silver ball move or do something? It appears fixed. Not sure it's purpose. Safe to disconnect breather pipe at section in tail?
Fuel, electrics, spark, bang etc?
Closest motorrad 100 km away, and it's Sunday. Mañana.
Any further assistance here appreciated. Temp mid 30s, altitude 1000m. Tow truck other option.
 
Oh for a Chinese man with small hands today. Ok have all out in pieces, why reverse the one way valve? It seems to work as should. Everytime I have this problem I open the tank to see if there is any pressure either way but nothing. Going for a smoke, far away from my open fuel tank. Chris
 
Ok, test run coming up, I wonder how far the next bridge is in this desert land? Destination Almeria.
Tim - many thanks again for you hospitality last night, I should have stayed by the pool today!
cf
 
No not really, followed Bem's advise but found nothing conclusive other than a bit of dust in the tubes. Learnt a bit more about what goes on in that area of the bike. I actually didn't realise that was a breather, I thought it was an overflow tube if you fill too much of the good stuff!
Talking of which I knew there was good reason to always keep my face shield down whilst fuelling. After deciding taking slip road in the wrong direction into Guadix town was a better option than proceeding into unknown desert I thought a fuel top up in order. Take note pump number 4 at Repsol Guadix has no auto cut off. It dumped at least a litre over bike, me and forecourt. It's certainly full now. Did the Spanish man rush out to shut down the pump or investigate through fear of another incident? No, just offered tissues to wipe away highly flammable liquid. Spent a few miles checking right legs for any sign of flames, in between waiting for bike to de power whilst overtaking lorry with a tail gater close behind. Concentrates the mind when you might lose all acceleration at any given moment.
Well she got me to destination and beyond. Cabo de Gata great spot.
Head back south to BMW Almeria tomorrow for a check over wasting probably 3 hrs to be told computer says nothing or crack on North in hope she just preferres being at sea level much like myself? Common denominator in all but really the first case has been altitude. Pushed through another little isoclimate of 39c today whilst observing snow high on the Sierra Nevada. No sympathy expected. Despite mechanical issues it's been a great trip.
Hope you all had a nice weekend and looks like UK temps on the rise, it's all coming from this direction, if you get a waft of fuel as you ride that'll be my puddle slowly evaporating from pump 4.
Thanks for the input. Fez
 
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