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Online iNCORRIGIBLE

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A "KLUNK"
« on: 30 March, 2019, 08:32:45 AM »
Hi All.Got a silly one going on on my 2009 Biffer! As soon as I ride over a road bump/hole at over say 30mph bike makes an obvious metallic ,Klunk.Can't see/ feel anything loose. All thoughts most welcome.Thanks,Ed.(Southminster,Essex)  :087:

Offline Art

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Re: A "KLUNK"
« Reply #1 on: 30 March, 2019, 09:00:30 AM »
Suspension - Either front or rear suspension stanchion bottoming out.
Drive chain - Chain slack, worn chain slider.
Centre stand - Weak or failed centre stand spring
Side stand - Weak or failed side stand spring (although this should also cause the engine to cut out)

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Re: A "KLUNK"
« Reply #2 on: 30 March, 2019, 09:58:35 AM »
Thanks,Art.Will check those four out & report back! Ed. :123: ps sounds/feels like the rear end?
« Last Edit: 30 March, 2019, 10:01:10 AM by iNCORRIGIBLE »

Offline Art

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Re: A "KLUNK"
« Reply #3 on: 30 March, 2019, 10:30:35 AM »
Could also be a rear wheel bearing, there are three - two wheel bearings and the cushion drive (rubber damper flange) bearing. Although if these are failing you should notice a twitching at the rear end and it would be an MOT fail.

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Re: A "KLUNK"
« Reply #4 on: 30 March, 2019, 06:47:56 PM »
Hi,Art.Forgot to mention that she is only at 11,000 miles.Chain adjustment seems to be a front runner for the noise as I have been adjusting on the centre stand & not the side stand as instructed! Will update you on the outcome.Ed.

Offline Art

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Re: A "KLUNK"
« Reply #5 on: 31 March, 2019, 10:59:48 AM »
You can adjust the chain on either the centre stand or the side stand. What's important is that the the front and rear sprockets align with each other and the swinging arm (see drawing) and that chain slack of between 1 and 1.5% of the total chain length (20 to 30mm) is measured at the tightest point.
« Last Edit: 31 March, 2019, 11:02:55 AM by Art »

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Re: A "KLUNK"
« Reply #6 on: 31 March, 2019, 01:23:33 PM »
Thanks,Art. I was following the HondaOwner's & Workshop manuals who make definite statements about using the sidestand.Have compared both methods & can't see any difference in the result! Is certainly  easier with the bike on the centrestand.Ed. :001:

Offline tonywing

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Re: A "KLUNK"
« Reply #7 on: 31 March, 2019, 05:18:44 PM »
I had a similar problem when I first purchased my 2009 Mk1. I discovered that the previous owner had probably dropped the bike on it's left side and this had resulted in the exhaust being pushed in closer to the bike that it should be. When I went over a bump the exhaust came into contact with the rear axle bolt and over time it had made a dent in the exhaust. The exhaust being pushed in was hardly noticeable. I replaced it with a second hand one off Ebay for £30 and problem solved. :028:
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Offline Liv0704

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Re: A "KLUNK"
« Reply #8 on: 31 March, 2019, 05:48:29 PM »
I had a clunk under the same scenario, ended up being a loose motor mount.

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Re: A "KLUNK"
« Reply #9 on: 31 March, 2019, 08:33:03 PM »
Many thanks to both Tony & Liv.Have yet to run the old ZimmerBlade over a series of suitable lumps/bumps but will certainly show my findings in a few days.Thanks again Pete. :123: