This need's reporting to BMW!!!

  • Thread starter Thread starter Phil W
  • Start date Start date
O.K, i have read the first page of this thread, but dont know what problem your all actually talking about. Can someone give me details please.
 
O.K, i have read the first page of this thread, but dont know what problem your all actually talking about. Can someone give me details please.

For whatever reason, the pinch bolts on the bottom yoke are not always as tight as they should be. It's good practice to nip them up with a Torx key every now and then.
 
Wapping,

Not everyone has a fountain of mechanical knowledge ........ I wanted to be as informed as possible before I approached the dealer.

john1215

OK, let's take it again.

Nobody here has seen your bike, so it is incredibly difficult to imagine what you think you are looking at / experiencing, beyond a real fear that it is going to meet the nearside curb.

You are reasonably sure that your bike is pulling to the nearside and that the bars are not straight in relation to the front forks / wheel. That is either true, in which case you need to get it checked, preferably sooner rather than later. A dealer will tell you, for sure.

Or it is not the case. This a dealer will help you with, too.

Either way you will find out very quickly, which will put your mind at rest. That will save a lot of guessing on here and you having to guess the best way to enact any of the suggestions, particularly as home home mechanics are not your forte.

What do you need to be informed about? What multiple causes can there be? Most motorcycles (including most GS's) are perfectly straight (within tolerance) at the front. If not, they possibly have bent bars, lose headstocks, or have been wrongly assembled at some point, or have been in a crash, or the tyre is wrongly inflated or maybe significantly out of balance or maybe a combination of these.

What do you need to tell / ask the dealer? Exactly what you have asked here, nothing more, nothing less..... the advantage they (and you) will have is that they (unlike us) will be able to see the bike, check it over and if necessary ride it.

You are clear that your perception only manifested itself when you were able to see the front, the tankbag having slid away. A clear pull to the left sufficient to
If I rode with the bars/yoke in line with the rest of the bike I would have ridden into the left hand kerb.
should be obvious. You are convinced that it wasn't there before, so the only intervention has been the simple removal / replacement of a wheel and its tyre, which occurred at a well recognised dealer's. Go back to them with your concerns. Chances are you will be satisfied one way or another before the year is very much older.

There. A much longer answer, that probably told you no more than you already knew to be true: That bikes do not suddenly steer themselves into curbs as a rule and one that does needs to be checked over, sooner rather than later.

Cheer up :beerjug:
 
THIS might be useful.

Thanks to everyone who has replied to me, I'm grateful. I've looked at this list but can find no mention of Bottom Yoke pinch bolts. I assume they have a proper name and I wonderd if anyone could tell me what that is please. Also, some mentioned that the correct torque for the bolts is 24 NM, well on the steeribng sections of the list mentioned above there are no settings of 24 NM.

John1215
 
It is certainly worth checking but I wouldn't panic if a couple of pinch bolts are a little lower torque than spec. Things do work loose with time. Due to my own error I forgot to torque the upper pinch bolts on an enduro bike, finished a 4 hour event before realising. The lower bolts were 15Nm and they held the forks while being hammered off road! Steering did seem a little vague though! If they were that loose on a road bike I reckon you'd notice straight away as it would feel wrong. If your first corner is flat out knee down you might have a problem.
 
Because the two bolts in each side of the lower fork bridge work together as a pair to provide clamping force, tightening one bolt to the correct torque value tends to 'relax' the bite on the other bolt, and so forth....

When I tightened mine, it took several stages of tightening with a torque wrench to each bolt repeatedly before getting the pair equally set to 25Nm.

I suspect that at manufacture on the assembly line, the bolts are tightened individually once only each with a torque calibrated air wrench tool, thus the above problem is not noticed (I doubt they have time to keep tightening and checking by hand like we can).
 
Because the two bolts in each side of the lower fork bridge work together as a pair to provide clamping force, tightening one bolt to the correct torque value tends to 'relax' the bite on the other bolt, and so forth....

When I tightened mine, it took several stages of tightening with a torque wrench to each bolt repeatedly before getting the pair equally set to 25Nm.

I suspect that at manufacture on the assembly line, the bolts are tightened individually once only each with a torque calibrated air wrench tool, thus the above problem is not noticed (I doubt they have time to keep tightening and checking by hand like we can).

i tend to agree, mostly.

mine came loose repeatedly, even when loctited.

did 'em up by feel carefully, and they've been fine ever since. tried doing them up evenly and gradually using torque wrench, but it just didn't work :nenau
 
mine came loose repeatedly, even when loctited. :nenau

Cookie can you please clarify...
When you comment that the bolts came loose are you saying they have physically unwound (despite being thread locked..which as an engineer i find hard to accept if the product was correctly applied)...did you apply marker/tamper paint on the bolt heads to confirm this?? or have the bolts physically stretched, thereby reducing the clamping force... as these are two completely differing reasons, the point requires clarification.
 
Update

Hi,

I bought a GSA in November 2010 from Allan Jefferies and everything seemed okay. I put a tank bag on it after the first week and the bag stayed on until I noticed that the front tyre wasn't keeping its pressure. At the beginning of December I had the tyre checked by Rainbow at Rotherham who found that the front tyre was defective and that air was escaping from the area around the tyre bead. The tyre was replaced under warranty. The tank bag was still on my bike when I brought it out of the repairing dealer and I discovered that a buckle on the bag was broken. I removed the bag and was riding along scrubbing the front tyre in when I lookwed down to find the top yoke appeared out of alignment with the rest of the bike. If I rode with the bars/yoke in line with the rest of the bike I would have ridden into the left hand kerb. The alignment was perfect when I picked the bike up in November but now the alignment is not right. Would this have been caused by the wheel being removed to repair the tyre or is it likely that this has happened over the course of the first 1000 miles and I've not noticed it due to having the tank bag on (which hides the top yoke incidentally). I'm not trying to blame either Allan Jefferies or Rainbow for this but wondered how this might have occured and is it something I should get done asap before riding much further.

Thanks

John

A quick update for you all. I had the bike collected by the dealer on Thursday. After examination the bottom yoke was found to be twisted when they took it off. The problem is likely to have been caused by poor packaging prior to shipping and not caused by any external forces. A new part has been ordered and I'll be back on the road soon.
Thanks to all who contributed with help and advice.

:clap
 
Just for the record

Hi all, just for the record my new GSA has done 700 miles since purchased in Nov. I checked the torque setting on the bolts and they seemed fine, I then removed the bolts to see that threadlock had been applied during assembly of the bike.

Perhaps they are topside of the problem and are putting threadlock on as a matter of proceedure?

By the way, if there wasn`t any on I was going to apply some anyway.

regards,

Mark
www.cymarcbikeparts.co.uk
 


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