Author Topic: Whine,squeal, singing noise?  (Read 377 times)

Offline spiney

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Whine,squeal, singing noise?
« on: July 24, 2020, 05:05:17 PM »
1981 has a high frequency noise around 2-3 thousand revs not there on start up but quickly appears as soon as engine warms up. Sounds like its coming from the very front of the engine. I have replaced both rotor (not stator) and bean can but no change. There when stationary or underway pull in clutch lever no change. Have a mechanic mate with a lot of airhead experience but as he has a very steep industrial high frequency hearing loss he can't hear it very well?? Any ideas?
1981 r65
1976 90/6

Offline wilcom

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Re: Whine,squeal, singing noise?
« Reply #1 on: July 24, 2020, 07:48:33 PM »
Quote
Have a mechanic mate with a lot of airhead experience but as he has a very steep industrial high frequency hearing loss he can't hear it very well??

Since it is soo hard to type a noise.........any chance of taking a video(with sound :)) and posting to Youtube so we could all have listen ?
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
1982 BMW R65LS 
past:
1979 R65
1980 R65
1982 R80RT
1974 R90/6
1972 R75
1964 R50/2
19xx R27
ZX-11

Offline spiney

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Re: Whine,squeal, singing noise?
« Reply #2 on: July 25, 2020, 04:00:21 AM »
Yep I'll get a video with sound as soon as I can.
1981 r65
1976 90/6

Offline Kelvin

  • Posts: 50
  • R65LS
Re: Whine,squeal, singing noise?
« Reply #3 on: July 25, 2020, 04:07:51 PM »
I once had a noise that would answer that description after replacing the camchain. Squeaking at only a particular rev range, and only under power. Because I heard it only under power I only noticed it when riding the bike, not in the garage. The fact that you only observe it warm also suggests camchain: a worn camchain is often quiet on startup, only audible when warm.

Solution was to take the timing cover off and adjust the chain guide carefully.

How long since you've replaced the camchain? I would expect to do it at 80k km.
1983 R65LS 1985 to 1988
1983 R65LS 1996 to present.
1984 R65LS 2019 to present.

Offline spiney

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Re: Whine,squeal, singing noise?
« Reply #4 on: July 26, 2020, 12:53:59 AM »
Kelvin unfortunately I have very little knowledge of the bikes history although pretty sure its only done 50,000K. Have not inspected the cam chain but it may be an idea. Far too wet today to have a ride and record the noise.
1981 r65
1976 90/6

Offline spiney

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Re: Whine,squeal, singing noise?
« Reply #5 on: July 27, 2020, 05:40:18 AM »
Took me a while but I put a video on u tube https://youtu.be/uJwQGamFL0Q

This is after a 15 min ride around the block.
1981 r65
1976 90/6

Offline donbmw

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Re: Whine,squeal, singing noise?
« Reply #6 on: July 27, 2020, 09:40:58 AM »
Saw your post on Facebook. I didnít hear anything that sounds abnormal.
1975 R90/6, 1980 R65, 1982 R65, 2015 Ural Patrol & 1959 Triumph TR3

Offline wilcom

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Re: Whine,squeal, singing noise?
« Reply #7 on: July 27, 2020, 10:57:25 AM »
I hear the sound between 2-3000 but, like Don said,  it just sounds like normal Beemer stuff to me.
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
1982 BMW R65LS 
past:
1979 R65
1980 R65
1982 R80RT
1974 R90/6
1972 R75
1964 R50/2
19xx R27
ZX-11

Offline Bob_Roller

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Re: Whine,squeal, singing noise?
« Reply #8 on: July 27, 2020, 02:52:26 PM »
Do you have a mechanics stethoscope ??

You could try having someone else operate the throttle while you put the tip of the scope on various parts of the engine .

I listened to the video and did not hear anything out of the ordinary either .

You could check the exhaust system for looseness and fasteners in the area .
'81 R65
'82 R65 LS ?
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

Offline Kelvin

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  • R65LS
Re: Whine,squeal, singing noise?
« Reply #9 on: July 27, 2020, 04:04:35 PM »
I also heard nothing out of the ordinary, so my hypothesis about the camchain is looking a bit weak.

In addition to checking the exhaust system you might check the air intake: you don't have a whistling cable in front of or leaf stuck inside the air intake horns?
1983 R65LS 1985 to 1988
1983 R65LS 1996 to present.
1984 R65LS 2019 to present.

Offline tunnelrider

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Re: Whine,squeal, singing noise?
« Reply #10 on: July 28, 2020, 05:51:47 AM »
Had a look at the video - the whine sounds a bit different to me how it exists under no load - I do get a slight whine when attempting hard acceleration low down the revs under way, I always thought it must be the much read about induction 'roar' (I'd hardly call a roar).
Quote
In addition to checking the exhaust system you might check the air intake: you don't have a whistling cable in front of or leaf stuck inside the air intake horns?
Good point Kelvin I think I've always had a cable in front of the intake horns
'85 Black R65 / '74 GT185 / '83 Pantah 500 / '90 Super Tenere 750  / '01 DRZ400 dirt only

Offline spiney

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Re: Whine,squeal, singing noise?
« Reply #11 on: July 28, 2020, 03:56:20 PM »
Thanks for all the tips I will check everything suggested. I do have access to a mechanics stethoscope so will borrow it and see if I can zoom in a bit.
1981 r65
1976 90/6

Offline Luca

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Re: Whine,squeal, singing noise?
« Reply #12 on: August 11, 2020, 08:23:17 PM »
Quote
Thanks for all the tips I will check everything suggested. I do have access to a mechanics stethoscope so will borrow it and see if I can zoom in a bit.

often you can get away with just holding your ear to the handle of a long screwdriver and placing the business end at your inspection points.  I can hear a little bit of a whine, but nothing unusual.  It actually sounds pretty good to me!