SE-i knock - Steve Saunders Goldwing Forums

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post #1 of 24 (permalink) Old 01-24-2006, 06:54 PM Thread Starter
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Well, let me TRY this once at least. It is a WMA file of the rattle on my SE-i that is bugging me. Speed ~55 mph, ~3700 RPM, very slight uphill grade. Recorded on my MP3 player in the pocket of my leather jacket, so not the best quality.

So... whatcha think? Carbon? Bearing? Phase-of-the-moon?

[media=320,256]http://home.comcast.net/~jonesn7/SEi_knock_2.WMA[/media]

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post #2 of 24 (permalink) Old 01-24-2006, 07:40 PM
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Hard to say, does it make that noise when in neutral?

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post #3 of 24 (permalink) Old 01-24-2006, 07:54 PM Thread Starter
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No, just when under load, either mild load (barely over "float") or moderate - not heavy. And, it starts at about 3200 RPM and stays there until over 4000 RPM, when I think other sounds drown it out.

Sorry, I didn't mean for the clip to auto-play each time. At least it doesn't loop.

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post #4 of 24 (permalink) Old 01-24-2006, 08:36 PM
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Where was that mp3 player located? In your pocket? Or in pocket on bike?

BOB

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post #5 of 24 (permalink) Old 01-24-2006, 08:37 PM
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Duh ! I can't read. Pardon my blunder. I hear like a ticking sound. Is that the noise you're referring to? How many miles on odometer?

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post #6 of 24 (permalink) Old 01-24-2006, 08:54 PM Thread Starter
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Around 38k on the clock. From everything else it seems to have been well cared for, but I don't know how hard the dairy farmer that I bought it from drove her. I kind of suspect carbon built up. I'm trying to get some TEC to do the neighborhood a favor and make sure they don't have any flying insects this winter.

The ticking sounds more like rapid hammering on the block when it is your bike and you are astraddle her. My co-worker and I were talking about that today. Always sounds worse when it's your bike. I doubt he could ever hear it if he rode mine - he rides a VTX 1800 with big straight pipes. I couldn't hear mine rev when I started it next to his just idling today.

BTW, I changed oil this weekend, after having run 1/2 qt MMO in with it for ~ 150 miles. Put a new filter and straight 15W40 Rotella in, no change in sound. Also ran stethescope all over it while idling and reving - maybe a little sound near #1 when reving.

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post #7 of 24 (permalink) Old 01-24-2006, 09:04 PM
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pidjones wrote:
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No, just when under load, either mild load (barely over "float") or moderate - not heavy. And, it starts at about 3200 RPM and stays there until over 4000 RPM, when I think other sounds drown it out.

Sorry, I didn't mean for the clip to auto-play each time. At least it doesn't loop.
Pidjones, that noise is audible but hard to discern on my computer speakers.. It is light enough to stay on my upper speakers & none out of the sub woofer so if your recording is an accurate representation the noise is light (not a bearing)...

Any chance you have an exhaust leak or pin hole in the exhaust?

Can you make another recording with the recorder taped to some steel part of the bike near the engine.. You have a lot of background, intake noise & combustion noise so the knocking is very hard to break out on it's own..

If you can get a better recording without the intake & engine mechanical noise maybe it will a be a little clearer & I could then run it on the acoustic analyzer at work & get the frequency of the peaks vs order.. Thatmight point us to the component & possibly order (is your RPM accurate?)..

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post #8 of 24 (permalink) Old 01-24-2006, 09:06 PM
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38k shouldn't cause any bearing problems, unless it may have accidently been run with no oil, or in it's history, if the oil plug coulda come out. What I do know, is the exhaust headers are notorious for leaking, and causing ticking. Quite annoying. Usually that noise manifests itself under load. Then there's the "center collar " issue. Might check into that.

If it sets for a week, what does it sound like in the first second of running? (the time it takes to get your finger off the starter button) Lots of rattle?, then instantly gone?

BOB

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post #9 of 24 (permalink) Old 01-24-2006, 09:13 PM
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First thought was post ignition, but it could be the quality at which I hear it, since it also changed when you accelerated.
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post #10 of 24 (permalink) Old 01-24-2006, 09:13 PM Thread Starter
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I also ran an open-tube stethescope around the exhaust on both heads - not a puff. I'll see what I can do about another recording, but the little MP3 has no mike jack - just a hole on the end of it. I know there is a lot of wind noise at these speeds, so I had it in my pocket to try to muffle a lot of that. Of course I muffled everything else along with it. I even had a piece of tape over the mike hole to cut the volume some, because the thing has too much gain and was overloading itself. I think if I run at higher sound quality, though (this was at 64 kbps) it might have more headroom.

Maybe I can duct tape it somewhere under the engine covers. Maybe the covers will knock down wind noise. I could try it in my helmet, cause it sure sounds too loud in there!

"Love 'em all... Let God sort 'em out!"
'52 wife - '69 daughter - '83 daughter
ex '86 SE-i
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