surging post service

[ADV London]

Can anyone help,

Prior to a 6000 mile service on my 2 valve 1150 Adventure the engine was running beautifully. Having had a 6000 mile service by a Hertfordshire BMW dealership the bike has surging problems at any fixed throttle opening and constant road speed the engine surges.

The surging was explained to the service manager who took my bike for a test ride and returned stating he was unable to recognise the condition and was unable to induce the surging I had described. I was made to feel that the very real surging I was experiencing was all in my imagination.

I rode away from the dealer lost for words on my surging bike made to believe that this is a condition due to the nature of the beast of the 2 valve boxer engine.

I spoke to a Motorrad technician at the NEC Called Harvey who stated that this condition is typical with valve clearances set incorrectly.

Has anyone had the similer experence with surging due to incorrect valve settings? and the problem retified by correct adjustment?

 

[cookie]

sounds like the throttle bodies need balancing.

dealers

 

[ADV London]

Throttles were synchronised as per service!!

 

[Wayne's World]

Mine did that after it's 6000 mile service, checked the valve clearances myself when I got home and found an exhaust valve was waaaay to tight. Correctly adjusted and all was fine.

 

[J.Garth Milam]

Surging?

A couple of thousand miles ago experienced a serious suging problem as well. But mine may have gone beyond a minor surge as I think you're describing. At idle my 1200 reved up to over 2,000 r. At speed it could even be worse. My feeling was that I had picked up something in the gas that logged itself in an injector or elsewhere. By the time I got it to the dealer it had disappeared. The computor indicated that there had been some previous problem but no indication of what caused it. They felt it was in the gas as well. No surge at all now.

Take care, ride on.

 

[cookie]

Throttles were synchronised as per service!!

well, it seems pretty likely it's something the dealer fiddled with & got wrong, or it's a hell of a coincidence.

TBS or valve lash? i'd check both, but as wayne's world has had identical scenario, i'd look at tappets first perhaps.

 

[bmwrich58]

Many people have made the same claims "Dealer Pucked it UP".

This has lead many cyclists to learn how to do their own maintenence.
As you know,most dealer employee's are "under the gun" to "move bikes in an out quickly" $$$$$$
time=money and money=time!

Doing it yourself, you got all the time in the world to do it "Right".

And you'll get self satisfaction and save yurself a few "bucks"!

 

[Guzzler]

Best way to take of it,

1. Set the Hall sensor to BMW TDC
2. Set the rocker end play
3. Set the valve lash
4. Set the Throttle position sensor
5. Put in Champion RC9YC spark plugs
6. Syncronize the Throttle bodies

Do these six things in one sitting, being VERY careful to do it accurately, you should have a bike that shouldn't surge.

 

[carbold]

Sorry can't help, never had a BMW service and/hence never had surging...

 

[themadprofessor]

I do my own as well.

NO SURGING!

 

[Spout]

I also do my own servicing and don't suffer any surging - until I recently filled up at a "cheapo" petrol station. Within 50 miles I was experiencing awful surging and hesitation.

I was all set for a fuel filter change, valve clearance, throttle balancing session over xmas, but a tank full of BPs finest has cured the problem. Again it took 60 miles to 'flush' the system out.

 

[skywalker]

1st check that you have the bright yellow coding plug fitted .its inside the relay box, its in the middle of the box as you look at it.
Assuming that everything else is correctly set up,check that the rubber inlet manifolds aren't leaking.I've mentioned this on numerous occasions on this site & its a problem i encounter on a regular basis -even on very low mileage bikes.
Start the bike up and allow it to idle.Get some WD40 & spray it around the inlet manifold where it bolts to the head- listen for any change in engine note. Left side for some reason tend to be favourite but its adviseable to change both.Any change in engine note points to air being pulled in at this point creating an even weaker mixture than normal creating the surgeing you are experiencing.

 

[ADV London]

Thanks to all of you who have taken the time to write a reply with respect to this condition. I will let you know the results to all of your suggestions in due course.

regards.....ADV London

 

[Paul Dilley]

Just one thing to add to all this above. Just check that the rubber caps have been put back on the tiny tubes at the bottom of the throttle bodies. This is where the throttles are connected to the balancing equipment and it has been known these to be left of after servicing meaning that there is a air leak. Easy to see on a GS but this did happen to me on a RT and it really does make them run strange.
Good Luck

 

[Spanish Bob]

similar thing happened to me in Spain. I insisted that it was wrong and not a coincidence. They told me to bring the bike in again, which I did. They called me to say they found nothing, but low and behold the bike ran like a dream. Now thats odd isnt it?

 

[cookie]

dealers