Author Topic: Strange whine from front of bike  (Read 610 times)

Offline florence

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Strange whine from front of bike
« on: November 25, 2017, 10:38:17 AM »
Approaching a local town in the pouring rain after about a fifteen mile ride, a terrible grinding whine started to come from the front end.  I touched the brake momentarily to see if it was coming from the disk, no change.  Eventually, after much pointless inspection, I worked out it was coming from the speedo and after a thump it went away for a moment but then soon came back.

I'm only relating this story in case it happens to anyone else, it was very worrying because I had recently had the front end to pieces to replace the mudguard and thought maybe I had forgotten to tighten something.
« Last Edit: November 25, 2017, 10:40:08 AM by florence »

Offline Tomb

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Re: Strange whine from front of bike
« Reply #1 on: November 25, 2017, 12:35:45 PM »
I used to get a horrible whine from the rear of the bike, it went away now I'm single again ;D

I get the same on my 500, I've tried grease, oil, and WD40 on the speedo cable all of which made a difference but it can still come back and go randomly. The only thing I did think was it was when the weather was cold, which could be causing yours now.
Tom
'73 CB550 with CB500 engine café racer
'62 CB77 Sprinter
'70 CD175
'78 CB550 with sidecar
'80 Z50R
And a load of old Yamaha 1100's

Offline florence

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Re: Strange whine from front of bike
« Reply #2 on: November 25, 2017, 06:08:38 PM »
I think you are right.  Foolishly, in the summer I hardly rode.  Now it's winter I'm using every day. 

I do have a spare but it doesn't record mileage which was a problem with MOT.  However, it had it's last MOT in May.  Next year it will be exempt, hooraay.....so will probably swap back.

Offline Nurse Julie

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Re: Strange whine from front of bike
« Reply #3 on: November 25, 2017, 06:32:52 PM »
I used to get a horrible whine from the rear of the bike, it went away now I'm single again ;D

::) ::) ::) ;D ;D ;D
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Offline davidrsmith

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Re: Strange whine from front of bike
« Reply #4 on: November 25, 2017, 09:52:47 PM »
Excuse my ignorance but doesn't a bike require an MOT every year,  or does it not need one when it becomes historic (40 years old)?

Thanks
Dave

Offline Nurse Julie

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Re: Strange whine from front of bike
« Reply #5 on: November 25, 2017, 10:00:56 PM »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Tomb

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Re: Strange whine from front of bike
« Reply #6 on: November 26, 2017, 08:30:27 AM »
I'm surprised your speedo odometer causes a problem at the MOT, the speedo is not part of the MOT. MY CB72/77 doesn't have a speedo, and the odometer of the little Chinese CG125 copy I ride to work fell out of the speedo, neither of them cause a problem for MOT.

Another thing I noticed about the speedo whine was that it suddenly stopped as my speed reduced, almost like some internal resonance had started it. When I first had the problem I would coast to a stop trying to listen to it.
Tom
'73 CB550 with CB500 engine café racer
'62 CB77 Sprinter
'70 CD175
'78 CB550 with sidecar
'80 Z50R
And a load of old Yamaha 1100's

Offline florence

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Re: Strange whine from front of bike
« Reply #7 on: November 26, 2017, 01:05:30 PM »
I just meant that the mileage wouldn't change from one year to the next which I thought might look bad.

Also it's quite good to record mileage to know when to change the oil, i.e. every 1000 miles.

Offline Tomb

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Re: Strange whine from front of bike
« Reply #8 on: November 26, 2017, 01:36:03 PM »
Gotcha, I thought you meant they questioned it.
Tom
'73 CB550 with CB500 engine café racer
'62 CB77 Sprinter
'70 CD175
'78 CB550 with sidecar
'80 Z50R
And a load of old Yamaha 1100's

 

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