How much noise is NORMAL? - BMW Luxury Touring Community
 
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post #1 of 15 Old May 2nd, 2009, 10:05 am Thread Starter
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Question How much noise is NORMAL?

Last evening I showed my new (to me) 2001 LT to a friend. When I started the engine he immediately noticed the -weird- banging noise from the brake pump and asked me what the heck was wrong. Told him that when I bought the bike from a BMW dealer a couple of months ago, I was told that this noise is normal. My friend shook his head and said: If I where you, I WOULD HAVE IT CHECKED.

Having been thought that fluids are not compressible, unless the brake pump has a sort of "lung" or air reservoir: what the heck is it compressing most of the time?
Does it make this noise only when idle or also at higher RPM's?

I've been trough BMW's repair manual, but it only describes how to or what to do in order to repair / assemble / disassemble the brake system. No reference to how it "sounds" under normal conditions.

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post #2 of 15 Old May 2nd, 2009, 10:30 am
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Re: How much noise is NORMAL?

Quote:
Originally Posted by neurodoc
Last evening I showed my new (to me) 2001 LT to a friend. When I started the engine he immediately noticed the -weird- banging noise from the brake pump and asked me what the heck was wrong. Told him that when I bought the bike from a BMW dealer a couple of months ago, I was told that this noise is normal. My friend shook his head and said: If I where you, I WOULD HAVE IT CHECKED.

Having been thought that fluids are not compressible, unless the brake pump has a sort of "lung" or air reservoir: what the heck is it compressing most of the time?
Does it make this noise only when idle or also at higher RPM's?

I've been trough BMW's repair manual, but it only describes how to or what to do in order to repair / assemble / disassemble the brake system. No reference to how it "sounds" under normal conditions.
Well, it is hard to say without actually hearing your LT, but my 2007 doesn't make anything even close to a banging noise. Mine makes a whining noise (very high pitch) when I activate the brakes and the servos come alive, but it makes no noise when idling and with the brakes not applied.

If yours really is banging, then I agree with your friend that something may be amiss and it is worth having a dealer or competent independent shop take a listen.

2017 KLR650 "Mule"
2007 K1200LT "Starship Enterprise", VOICE II, Navigator V, Motorrad Communicator
1987 Kawasaki Voyager XII
1976 Kawasaki KH400
1973 Kawasaki 100 G5
1970 Rockford Chibi (the orange one)

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post #3 of 15 Old May 2nd, 2009, 11:23 am Thread Starter
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Re: How much noise is NORMAL?

Quote:
Originally Posted by Voyager
Well, it is hard to say without actually hearing your LT, but my 2007 doesn't make anything even close to a banging noise. Mine makes a whining noise (very high pitch) when I activate the brakes and the servos come alive, but it makes no noise when idling and with the brakes not applied.

If yours really is banging, then I agree with your friend that something may be amiss and it is worth having a dealer or competent independent shop take a listen.

Hi Voyager,
It's hard to describe a noise... the one I talk about is between a rhythmical banging and a sort of rattling noise. When I apply the brakes, it dampens a little. It remains unchanged if increasing RPM's. This excludes a problem on the engine. In regard to the whining noise: mine makes it too, but I believe it is the gas pump or the fuel injection system. IN this bike whining does not change when applying brakes.

There's one way to find out if a man is honest - ask him. If he says, "Yes," you know he is a crook.
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post #4 of 15 Old May 2nd, 2009, 11:33 am
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Talking Re: How much noise is NORMAL?

this is in no way a complete explain, but from what i have been told our (excepting the very latest on some new models) is very much like what is or was used on Mercedes. The ABS system was pre-charged to reduce the time from when we ask the brakes to REALLY work and they are able to perform. Sort of a foreplay kind of thing where the action needed is right there all the time.

with this notation: should the time exceed 4 hr .................... :-)

Toby in New York
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post #5 of 15 Old May 2nd, 2009, 11:54 am
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Re: How much noise is NORMAL?

The way the servo assisted system is designed there should be no bangs or rattles. What I suspect you are hearing is the K bike rattle. Most noticeable at startup and at idle. It is caused by the movement of the gear train from the crankshaft to the clutch shaft and is associated with the alternator drive gear. These all fit rather loosely and will rattle about until loaded, ie. electrical load increased, RPM increased or clutch pulled in. You see two of the three gears in this photo.
Attached Thumbnails
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ID:	22870  

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #6 of 15 Old May 2nd, 2009, 2:33 pm
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Re: How much noise is NORMAL?

Quote:
Originally Posted by neurodoc
Hi Voyager,
It's hard to describe a noise... the one I talk about is between a rhythmical banging and a sort of rattling noise. When I apply the brakes, it dampens a little. It remains unchanged if increasing RPM's. This excludes a problem on the engine. In regard to the whining noise: mine makes it too, but I believe it is the gas pump or the fuel injection system. IN this bike whining does not change when applying brakes.
My 07 LT has a very distinctive whine only when the brakes are applied. Given your description of your LT, I think you should consider having a competent mechanic who is familiar with LTs take a listen.

2017 KLR650 "Mule"
2007 K1200LT "Starship Enterprise", VOICE II, Navigator V, Motorrad Communicator
1987 Kawasaki Voyager XII
1976 Kawasaki KH400
1973 Kawasaki 100 G5
1970 Rockford Chibi (the orange one)

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post #7 of 15 Old May 2nd, 2009, 3:54 pm
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Re: How much noise is NORMAL?

Doc:

The LT is subject to making all sorts of eird noises.

I have an '03, our brake systems are different. Having said that, mine makes a whine when I first turn on the key, the brake system that is. Stops within a few seconds.

On the left side of the engine are the fuel injectors. They will make a clicking/ticking noise with the engine running.

The alternator is mounted on top of the engine and makes a noise all its own, got to do with the gear train invloved, a gear type noise.

Some LTs have been known to suffer from a cracked/broken exhaust pipe at #1 cyclinder or broken the mounting studs. Might want to investigate that first.

The tupperware (clothing so to speak) makes noise while riding, kind of a squeak and sometimes it will rattle. The tupperware can also amplify or channel some noises.

Pretty hard to diagnose noises if not right there.

Good luck with it and hope its something easy and cheap.

By the way......... I have a spare exhaust system for an LT, complete. What that means is if you do have a cracked or broken pipe, we might be able to work something out to keep you on the road.

B D R
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post #8 of 15 Old May 2nd, 2009, 4:36 pm
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Re: How much noise is NORMAL?

Quote:
Originally Posted by jzeiler
The way the servo assisted system is designed there should be no bangs or rattles. What I suspect you are hearing is the K bike rattle. Most noticeable at startup and at idle. It is caused by the movement of the gear train from the crankshaft to the clutch shaft and is associated with the alternator drive gear. These all fit rather loosely and will rattle about until loaded, ie. electrical load increased, RPM increased or clutch pulled in. You see two of the three gears in this photo.
Thank you for the thumbnail. Excellent, visual explanation.

Avatar credit: Curtis Callaway, 2009
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post #9 of 15 Old May 2nd, 2009, 4:40 pm
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Re: How much noise is NORMAL?

I have a 2002 LTC and the brakes don't make any noise at idle. The pump only makes noise when you apply the brakes, then you can hear the pump
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post #10 of 15 Old May 2nd, 2009, 7:48 pm Thread Starter
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Re: How much noise is NORMAL?

Quote:
Originally Posted by gunny
Doc:

The LT is subject to making all sorts of eird noises.

I have an '03, our brake systems are different. Having said that, mine makes a whine when I first turn on the key, the brake system that is. Stops within a few seconds.

On the left side of the engine are the fuel injectors. They will make a clicking/ticking noise with the engine running.

The alternator is mounted on top of the engine and makes a noise all its own, got to do with the gear train invloved, a gear type noise.

Some LTs have been known to suffer from a cracked/broken exhaust pipe at #1 cyclinder or broken the mounting studs. Might want to investigate that first.

The tupperware (clothing so to speak) makes noise while riding, kind of a squeak and sometimes it will rattle. The tupperware can also amplify or channel some noises.

Pretty hard to diagnose noises if not right there.

Good luck with it and hope its something easy and cheap.

By the way......... I have a spare exhaust system for an LT, complete. What that means is if you do have a cracked or broken pipe, we might be able to work something out to keep you on the road.
Hi Gunny.
Thanks for the thorough description of the collection of noises our bikes make! Every Sunday owners of all kind of two wheeled vehicles meet some blocks away from where I live. (*) There I will compare the noises of mine with those from a couple of LT's that usually come by. If we cant' find out, I will shoot a short video and put on Youtube for all of you folks to tell me your thoughts.

(*) These meetings started about one year ago when two friends gathered for a chat and a beer, while looking at the river flowing by. Now more than 100 bikes of all kinds can be expected weekly: http://tigremotoclub.blogspot.com/
Neurodoc

There's one way to find out if a man is honest - ask him. If he says, "Yes," you know he is a crook.
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post #11 of 15 Old May 2nd, 2009, 11:23 pm
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Re: How much noise is NORMAL?

I'm not an expert on the LT, but I don't believe your 01 has the servoed brakes. On the oilheads, that didn't happen until 02, and I am under the impression that the LTs didn't get them until then either. So, if that is true, I really don't think you'd be getting any noise out of the brakes. More than likely the alternator or dry clutch rattle. Since you said it did change when you pulled in the clutch, I'd tend to believe that it is something like that. If it is the clutch rattling, I wouldn't worry about it as long as it isn't slipping. If you want to make yourself feel better, just ride with someone who rides either a Ducati or Moto Guzzi. That way, their bike's clutch will out rattle yours and you won't have anything to worry about. Could also do like my wife and kids and just turn up the radio louder until the noise disappears.
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post #12 of 15 Old May 3rd, 2009, 10:53 am
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Re: How much noise is NORMAL?

2001 was the model year the integral brakes were introduced but not all 2001 bikes have it.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #13 of 15 Old May 3rd, 2009, 9:05 pm
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Re: How much noise is NORMAL?

When you moved from 25 years of riding Japanese bikes to an LT like I did you find that the big German lady makes all sort of weird noises as described in some previous responses on this post. I was pretty concerned when I first heard the combination of alternator and tupperware noises. Not too mention the pretty "virile" 'CLUNK' when changing gears that was quite a change from the very smooth gear box of my last 2 Honda's. Once I understood that everything was normal I actually started enjoying the noises. This motorcycle has a soul.

Alain

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post #14 of 15 Old May 4th, 2009, 9:56 am Thread Starter
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Re: How much noise is NORMAL?

Quote:
Originally Posted by Alpac
When you moved from 25 years of riding Japanese bikes to an LT like I did you find that the big German lady makes all sort of weird noises as described in some previous responses on this post. I was pretty concerned when I first heard the combination of alternator and tupperware noises. Not too mention the pretty "virile" 'CLUNK' when changing gears that was quite a change from the very smooth gear box of my last 2 Honda's. Once I understood that everything was normal I actually started enjoying the noises. This motorcycle has a soul.
je crois que tu as raison! (I think you are right!)
Neurodoc

There's one way to find out if a man is honest - ask him. If he says, "Yes," you know he is a crook.
Groucho Marx
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post #15 of 15 Old May 4th, 2009, 12:59 pm
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Re: How much noise is NORMAL?

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Originally Posted by neurodoc
je crois que tu as raison! (

Alain

Vieux motard que jamais
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