Author Topic: What is causing this?? Video enclosed (Read 4399 times)

akinz · « **on:** June 22, 2011, 11:31:14 AM »

Hey Guys,

I'm relatively new to this forum. I've torn down my engine down to the cases and am waiting on the bolt to pull off the rotor.

In the meantime, I need to get some other areas addressed. Maybe I will find what's causing this noise when I split the cases, but it's hard to describe. When I'm driving along the bike does not sound constant, instead it sounds like one of the sprockets are ovalled. Have a listen. The only thing I can think of so far is the drive chain. It was stretched an inch over spec. Would that cause this?

1977 Honda cb550k Drive by

Thanks in advance.

Deltarider · « **Reply #1 on:** June 22, 2011, 11:36:30 AM »

Uh... is it a bird?

Duanob · « **Reply #2 on:** June 22, 2011, 12:33:47 PM »

I'm always amazed how many posters answer their own questions.

WarwickE36 · « **Reply #3 on:** June 22, 2011, 12:57:30 PM »

I watched this video at work with no speakers, why? Im not sure...

I found the Blair Witch Project style captivating

More videos like this please

akinz · « **Reply #4 on:** June 22, 2011, 01:01:44 PM »

Quote from: Deltarider on June 22, 2011, 11:36:30 AM

Uh... is it a bird?

Nice try, but the bike sounds just a taaaad different.
You can hear it more in this video, but you'll have to fast forward to 2:40 to hear it.... waaaa waaa waa waaw aww
1977 Honda cb550k drive by and take off

lone*X · « **Reply #5 on:** June 22, 2011, 01:34:34 PM »

My hearing isn't the best but if I am hearing what you intended, it does sound like chain noise. Uneven stretching will cause the chain to sing with a warble as it repeatedly tightens then loosens with every rotation.

Duanob · « **Reply #6 on:** June 22, 2011, 01:45:19 PM »

Nice bike BTW but with that much chain stretch I wouldn't be getting on it like that until I got a new chain. You might find it buried inside your cases. It's like a pay me now ($30 for a new chain) or pay me later (new engine cases) thing. I also thought I heard some stutter when you take off, maybe dirty slow jets?

Coyote13 · « **Reply #7 on:** June 22, 2011, 01:53:54 PM »

Quote from: Duanob on June 22, 2011, 01:45:19 PM

I also thought I heard some stutter when you take off, maybe dirty slow jets?

Probably also caused by the worn chain. If it's enough to make power delivery uneven at higher RPMs I would imagine that same on takeoff

akinz · « **Reply #8 on:** June 22, 2011, 02:34:54 PM »

Quote from: CoyoteUSP on June 22, 2011, 01:53:54 PM

Quote from: Duanob on June 22, 2011, 01:45:19 PM
I also thought I heard some stutter when you take off, maybe dirty slow jets?

Probably also caused by the worn chain. If it's enough to make power delivery uneven at higher RPMs I would imagine that same on takeoff

ya the stutter you hear is the slow jet. i had to clean them like 5 times before it got solved.

I remember seeing in the shadow from the bike, the chain flopping up and down constant with the noise. Thanks everybody for the insight.

nancy · « **Reply #9 on:** June 22, 2011, 04:06:24 PM »

How do ya get on with your neighbours? Nice sound but - it is loud!

Retro Rocket · « **Reply #10 on:** June 22, 2011, 05:04:30 PM »

Your chain is stuffed......I wouldn't ride it like that. I would change both the chain and sprockets or you run the risk of a short lived chain due to worn sprockets.

Hannibal Smith · « **Reply #11 on:** June 22, 2011, 09:12:49 PM »

No such thing as 1 inch of "stretch" (another misconception) with the chain still intact.

Chain "stretch" is measured with a set distance and specification of wear limits. I am super curious as to the "spec" you are talking about- what is the distance? 620 feet? Just kidding, but you do have me wondering-

Spanner 1 · « **Reply #12 on:** June 22, 2011, 09:29:35 PM »

New chain and at least a new front sprocket.... it's dare devil to ride fast with that going on.....

akinz · « **Reply #13 on:** June 23, 2011, 04:33:35 AM »

Wow, I'm glad you all think that it's the chain so I'll have to get it and some new sprockets ordered. Could I go down to a 520? Or is that impossible with the sprocket selection. I know also that I can't use an o-ring chain, so maybe I just answered my own question.

As to it being dangerous riding with the chain like that, I had no clue.
Thanks for the input.

akinz · « **Reply #14 on:** June 23, 2011, 04:38:57 AM »

Quote from: Hannibal Smith on June 22, 2011, 09:12:49 PM

No such thing as 1 inch of "stretch" (another misconception) with the chain still intact.

Chain "stretch" is measured with a set distance and specification of wear limits. I am super curious as to the "spec" you are talking about- what is the distance? 620 feet? Just kidding, but you do have me wondering-

Actually, I might have been elaborating a bit on the inch, but maybe a half inch. And yes it is ''stretched'' when you take a chain off and lay it on a flat surface, push it all together, measure that distance and then pull and take another measurement. That distance you've measured is the amount that the chain links have worn or stretched.

Retro Rocket · « **Reply #15 on:** June 23, 2011, 04:52:39 AM »

Quote

Actually, I might have been exaggerating a bit on the inch,

Fixed that for you....

akinz · « **Reply #16 on:** June 23, 2011, 04:55:03 AM »

Quote from: Retro Rocket on June 23, 2011, 04:52:39 AM

Quote
Actually, I might have been exagerating a bit on the inch,

Fixed that for you....

Thanks muchly. It's early hahah

Coyote13 · « **Reply #17 on:** June 23, 2011, 07:06:56 AM »

You can pretty much use whatever kind of chain you want (IIRC) as long as you get the sprockets to match. Lots of info on this site on the subject.

Cheers

Hannibal Smith · « **Reply #18 on:** June 23, 2011, 08:02:10 AM »

Quote from: akinz on June 23, 2011, 04:38:57 AM

Quote from: Hannibal Smith on June 22, 2011, 09:12:49 PM
No such thing as 1 inch of "stretch" (another misconception) with the chain still intact.

Chain "stretch" is measured with a set distance and specification of wear limits. I am super curious as to the "spec" you are talking about- what is the distance? 620 feet? Just kidding, but you do have me wondering-

Actually, I might have been elaborating a bit on the inch, but maybe a half inch. And yes it is ''stretched'' when you take a chain off and lay it on a flat surface, push it all together, measure that distance and then pull and take another measurement. That distance you've measured is the amount that the chain links have worn or stretched.

It's called "stretch" but what you are measuring is wear, the chain is not "stretching" in the classical sense.......it's "longer", but the elongation is the cumulative effect of wear (bigger holes/smaller pins etc.)

Duanob · « **Reply #19 on:** June 23, 2011, 10:41:54 AM »

I just oredered new sprockets and chain from these guys:

http://www.powersportparts.net/

Prices seem more than reasonable. front and rear JT Sprockets and KBC Heavyduty 530 x 100 chain all for $62 delivered.

TwoTired · « **Reply #20 on:** June 23, 2011, 11:02:11 AM »

Is the "warble" speed tied strictly to MPH or RPM? Does the same thing in lower gears per RPM or MPH?

PD carbs? Pods? No baffle? Any carb set up changes?

akinz · « **Reply #21 on:** September 13, 2011, 08:28:45 AM »

Quote from: TwoTired on June 23, 2011, 11:02:11 AM

Is the "warble" speed tied strictly to MPH or RPM? Does the same thing in lower gears per RPM or MPH?

PD carbs? Pods? No baffle? Any carb set up changes?

I'm pretty sure it has PD carbs, it's been a while now that I've worked on it, just been working on the engine. Stock airbox, no baffle, carbs I've put in 100mains. Everything else is stock. Warble is relative to the rpm, slower in the lower, faster in the higher rpm range. And yes does the same thing in all gears. I have the cases split currently, and there is no evidence of any missing teeth or failure.

excellrec · « **Reply #22 on:** September 13, 2011, 03:12:54 PM »

It could be the chain.. and we could all speculate on that for awhile. But, if you have to replace it anyways since it's so worn you may as well just see if it does the same thing after that. I would just go to a 530 as that is easy and many find that gearing the front higher helps keep the revs down at highway speed.. 5th would be more of an overdrive then. Good luck!

akinz · « **Reply #23 on:** September 14, 2011, 08:39:30 AM »

Quote from: excellrec on September 13, 2011, 03:12:54 PM

It could be the chain.. and we could all speculate on that for awhile. But, if you have to replace it anyways since it's so worn you may as well just see if it does the same thing after that. I would just go to a 530 as that is easy and many find that gearing the front higher helps keep the revs down at highway speed.. 5th would be more of an overdrive then. Good luck!

Couldn't agree more. Once it's back together (probably not until the spring) I'll have new chain and sprockets put on. I was thinking about it a little more last night, maybe it would be possible that one section of the chain is worn more then another, causing the warble... anyways, thanks for the input! Much appreciated

700504 · « **Reply #24 on:** October 08, 2015, 01:02:07 PM »

Did you ever resolve the issue?

News:

Author Topic: What is causing this?? Video enclosed (Read 4399 times)