Author Topic: 1973 CB500 - strange noise/left side  (Read 929 times)

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Offline Curt2005

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1973 CB500 - strange noise/left side
« on: September 12, 2012, 06:25:05 PM »
Going to do my best to describe this because it's driving crazy(ier).

Putting CB500 back on the road slowly. New rings, cleaned carbs, synced. Starts and idles great.  Been running it around he neighborhood stretching its legs. Runs good. Still may need some cleaning on the idle jets bc a little grumpy taking off until you're on the throttle good.

Ok, on to the question.  There is a noise coming from the left side of the motor while it's moving.  It's not the ticking sound like a valve, but more of a short whoosh (ugh, so technical sounding) every second or so.  It's too slow to be a wheel bearing sound bc it's slower than the revolutions of the wheel and doesn't increase in frequency in step with wheel speed. It will increase slowly as speed and revs increase but it sounds more engine/trans than wheel.

Also, took it around the block again tonight to study the sound more.  The sound is more prominent when applying throttle.  When you left off throttle and coast, it's still there but not as loud. Also, pull the clutch and it goes away....so is this a poorly adjusted clutch?

Thanks everybody, and sorry in advance the vagueness.

Offline robvangulik

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Re: 1973 CB500 - strange noise/left side
« Reply #1 on: September 13, 2012, 12:50:55 AM »
I'd bet on a drive chain issue.
Does it manifest itself when the bike is running through the gears on the mainstand?

Offline dave500

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Re: 1973 CB500 - strange noise/left side
« Reply #2 on: September 13, 2012, 01:02:27 AM »
are you using an o ring chain?

Offline Curt2005

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Re: 1973 CB500 - strange noise/left side
« Reply #3 on: September 13, 2012, 12:40:51 PM »
Thanks for the replies.

1.  PO removed the center stand so haven't had it up and run through the gears.  Will be picking up one soon and can try that.

2.  Re: the chain - its the original old crusty one and on the list to be replaced. 

Thanks guys!

Offline robvangulik

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Re: 1973 CB500 - strange noise/left side
« Reply #4 on: September 16, 2012, 08:41:00 AM »
Quote
2.  Re: the chain - its the original old crusty one and on the list to be replaced.
Which makes it even more plausible it's the chain making the noise ;)

Offline Curt2005

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Re: 1973 CB500 - strange noise/left side
« Reply #5 on: September 18, 2012, 07:02:08 PM »
Thanks man.  Will get a new one and report back!

Offline dave500

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Re: 1973 CB500 - strange noise/left side
« Reply #6 on: September 19, 2012, 12:32:30 AM »
if thats a crusty old chain you must replace the sprockets aswell!they should always be replaced as a set,once thats done you can get away with replacing a chain only once on those sprockets so long as they arent worn,the old sprockets will ruin your new chain,its false economy to do just the chain.

Offline Curt2005

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Re: 1973 CB500 - strange noise/left side
« Reply #7 on: January 29, 2013, 08:10:48 PM »
New chain and sprockets and the noise is.......GONE!  Thanks guys!!