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Author Topic: That rattle sound expensive!  (Read 1035 times)

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Offline Hush

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That rattle sound expensive!
« on: May 28, 2008, 02:19:32 AM »
OK this is also on my project thread but need a bit of sage input to calm my nerves.
My bike finally goes but at low revs there is a terrible rattling noise which disapears when you increase the engine speed.
Sounds like um? clutch plates about to fly to pieces or a tin can full of stones shaken.
I'm usually a restorer of old two strokes and if this was one I would immediately believe that the rings were shot and it needed a rebore, but this is a 4 cylinder 4 stroke and it fires up like a strong engine with good compression (this is a guess as I haven't done a comp test on it yet).
Does any of this sound familiar, maybe minutes before Chernobyl type melt down of your bike?
Could it be (yes please Honda God) a simple carb ajustment!
I'm not adverse to buying another engine for the bike, just the rarety of CB650's in NZ makes this almost an impossiblity.
Come on, shoot me some brilliance guys.........Hush.
« Last Edit: May 28, 2008, 03:01:31 AM by hUSH »
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline Shenanigans

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Re: That rattle sound expensive!
« Reply #1 on: May 28, 2008, 02:56:00 AM »
I would say maybe cam chain noise. The cam chains in these bikes can be very noisy or the carbs being unsynchronized causing "clutch rattle". It would never hurt to adjust both anyways...
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Offline DarkRider

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Re: That rattle sound expensive!
« Reply #2 on: May 28, 2008, 03:22:05 AM »
Figured someone else would think the same as i did. I suggested the same in the project thread.
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Offline bwaller

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Re: That rattle sound expensive!
« Reply #3 on: May 28, 2008, 03:23:05 AM »
+2 on carb synch
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Offline Hush

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Re: That rattle sound expensive!
« Reply #4 on: May 28, 2008, 04:37:37 AM »

I've been back reading my workshop manual and notice that a part I thought was from another project is actually from this Honda! :o ;D
It's quite a minor part but might explain the thought that I believed the sound to be like clutch plates rattling. ;D
I left the "bearing retainer" out when i reasembled the clutch today!!!     :-\
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline Hush

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Re: That rattle sound expensive!
« Reply #5 on: May 29, 2008, 04:33:27 AM »
Ok having repaired the clutch by adding the missing bit and readjusted the cam belt the noise is lessening but still quite noticable, just how noisey is acceptable with these SOHC bikes?
Would adjusting the cam chain once bike is warm be better and should I do it a few times to ensure the tension has taken?
Engine seems free enough and fires up with a decent fistfull of choke, settles to idle after a good few minutes.
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!
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