Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: florence on November 25, 2017, 10:38:17 AM

Title: Strange whine from front of bike
Post by: florence 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.
Title: Re: Strange whine from front of bike
Post by: Tomb 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.
Title: Re: Strange whine from front of bike
Post by: florence 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.
Title: Re: Strange whine from front of bike
Post by: Nurse Julie on November 25, 2017, 06:32:52 PM: Quote from: Tomb 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

::) ::) ::) ;D ;D ;D
Title: Re: Strange whine from front of bike
Post by: davidrsmith 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
Title: Re: Strange whine from front of bike
Post by: Nurse Julie on November 25, 2017, 10:00:56 PM: Discussed recently
http://www.sohc.co.uk/index.php/topic,13905.0.html
Title: Re: Strange whine from front of bike
Post by: Tomb 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.
Title: Re: Strange whine from front of bike
Post by: florence 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.
Title: Re: Strange whine from front of bike
Post by: Tomb on November 26, 2017, 01:36:03 PM: Gotcha, I thought you meant they questioned it.