Weird vibration @ 3200 rpm - Kawasaki KLR 650 Forum
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post #1 of 16 Old 11-02-2012, 04:04 PM Thread Starter
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Weird vibration @ 3200 rpm

I posted about this before but lost track of the post. Right about 3200 rpm when putting through town I get this vibration for lack of a better term. It happens both with rpm rising and dropping. I only really notice it in low gears and it is not very noticeable if I am giving it throttle but mostly just when kind of idling through town. Sitting still Clutch in or out, in gear or out it will do it a bit. Any ideas out there?


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post #2 of 16 Old 11-02-2012, 04:14 PM
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It could just be a harmonic vibration. Do you have nerf bars on? If so, what kind?

Do you feel it all over, in the handlebars, coming through the seat, or what?

Any gear, rising or falling, kind of rules out the chain, but make sure it is at the proper tension and that it is well lubed with no binding links.

T

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post #3 of 16 Old 11-02-2012, 04:21 PM Thread Starter
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What's weird is I don't feel it, I only hear it. Since I last posted about this I did the doo, air filter, chain and sprockets. I would also describe it as a surge, but again not something I feel but only hear. As my 8 year old says, weird.


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post #4 of 16 Old 11-02-2012, 04:41 PM
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Ah.

Well, even if I could hear it I might not be much help. Could very well be that I missed hearing something in mine a couple of weeks ago. .

T

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“Neither of the two people in the room paid any attention to the way I came in, although only one of them was dead.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


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post #5 of 16 Old 11-02-2012, 04:55 PM
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What type of sound? A metalic sound or a lighter sound maybe plastic? Alluminium? Heavy metal so to speak as in iron? When you changed your front sprocket, did you torque it back on? Then trap the nut using the locking washer or did you buy the prevailing torque nut? I had a nut come loose once and it wasn't capable of coming off the threads but it allowed the sprocket to dance around and it took me a long time to actually find the problem as bad as that sounds! I couldn't believe it would come loose! I now use a lock washer all the time....! I have also had a nasty rattle or vibration that sounded like it was coming from the front somewhere.....it actually was the righthand tank shroud bolt that was hitting the brace for the right side over flow bottle. Just enough to make a rattling sound....drove me nuts for an entire summer, found that one by mistake! There is also another sound like your keys are rattling around on top of the steering head nut, that drove me nuts as well. I actually rubber coated the top of it with liquid rubber to try and stop that noise...didn't stop it!! I can't for the life of me remember what it actually was at the moment but will get back to you when I do.....same thing though....something totally away from where I thought it was coming from.
Have you check all of your engine mounts for tightness? I trap all cables and wiring tight using zip ties to stop anything from vibrating or rubbing.
Check the front brake caliper for tightness....yep...I had it come loose once.....nearly came off...I was lucky to catch it in time. Again a strange rattling.

That's all I have at the moment, I'm sure I have more.....lol.

Willys
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post #6 of 16 Old 11-02-2012, 07:14 PM
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I notice a tire noise at about that speed that goes away when I am moving faster or slower. What tires are you running? Is it only on pavement or on gravel and dirt too?
Regards....justjeff

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Last edited by justjeff; 11-02-2012 at 07:17 PM.
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post #7 of 16 Old 11-03-2012, 03:49 AM Thread Starter
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Thanks for all the help so far, Yes I have HT nerf bars, the noise was both before and after changing sprockets. Describing as a harmonic is the best description. It is almost like a shudder goes through the bike as it hits the power band. I am trying to figure if it is something I should worry about or nit as much as I am trying to figure out what it is. I have a hard time thinking it is tire noise since it I notice it 1st - 3rd, I plan on trying to see if I can notice in 4th -5th but usually if I make there I am going at a good enough clip I don't notice it.
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post #8 of 16 Old 11-03-2012, 05:12 AM
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I've read your description and the responses and just can't get away from thinking you are simply not revving the motor enough, "lugging" it. I'm usually past that RPM by the time the clutch is fully out and above it after shifting into another gear. Mine shakes and shudders at that RPM and below also. What RPM ranges are you riding it?
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post #9 of 16 Old 11-03-2012, 05:57 AM Thread Starter
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It doesn't shake or shudder. And I would not say I am lugging it. It is typically in downtown areas where the speed limit is 25-35 and I am just coasting through. I will have try and record it. It doesn't happen at a speed but an rpm point. It is almost like @ 3200 it gets a shot of air, fuel, nitrous something but instead of feeling anything it just sounds that way. I will have to pay a but closer attention and see if I can feel it.


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post #10 of 16 Old 11-03-2012, 06:02 AM
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OK then, it was just a thought. Interesting, let us know what you find out.
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