Question about Harley Davidson FXD Dyna Super Glide Motorcycles

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Excessive vibration on my Dyna

I have a 1996 DYNA FXDS and noticed that the other day it was vibrating so much that the custom mirrors I had put on it were shaking so badly I thought the mirrors were going to fall right out! This was at idle too. The bike is smooth once she gets going and seems to be worse after heating up. I was in a traffic jam for over 20 min though and no the EVO was very very hot as no air was passing over it. I checked the motor mounts except rear one. They are all original....17 yrs old. Any ideas? Thank you for the help.

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17 years is a long time for engine rubbers on a v twin. But if the vibration is only in the handlebars, you might want to fit some heavier handlebar end weights. They are there to absorb vibration(they act as dampers.) But, if the vibration is in the engine, it may be worth checking the ignition timing. On a Big V the ignition only needs to be out by a small amount to set up a noticeable vibration.

Posted on May 05, 2013

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Posted on Jan 02, 2017

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1fastbob
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SOURCE: Taken 2007 Dyna in twice in 2 weeks for excessive

Harleys sure do some shaking. I would guess it has an issue with an engine mount either loose or worn out. I would try another dealer if one is near you.

Posted on Nov 07, 2009

wd4ity
  • 4565 Answers

SOURCE: engine vibration,new motor mounts,and stabilizier,94dwg help!

Ok, that's better. This is an engine that has run well before but now something is wrong.

I could be a magnet on the stator but usually they'll make a loud knocking noise. But one magnet could have come loose and simply moved. The only way to find out is to pull the primary and the stator. It's much easier to do on that bike than it is a Shovelhead in that you do not have to pull the inner primary. If you find this to be the problem and you replace the rotor, make sure you check the rotor for good magnetism. Don't laugh, we installed on a few weeks ago and the alternator would not generate any electricity. Turned out the rotor magnets didn't have enough magnetism. You could tell by holding a screwdriver to the magnets, the new one just didn't hold the screwdriver like it should have. Installed the old rotor, everything was fine. Harley had a problem with a batch of them and they don't know where they're all at so check it out before you install it.

Also, with that many miles on the bike, you need to check the motor mounts, both front and rear. The rubber will seperate from the metal parts of the mount. Check the upper stabilizer link as well. Check the primary chain adjustment as well.

As long as the engine is running properly and not making a noise or missing, this is the only thing I can think of at the moment.

Good Luck with it.
Steve

BTW: I've got a '94 Wide Glide. I love it. Wouldn't trade it for a brand new Softail.

Posted on Jul 05, 2010

  • 22 Answers

SOURCE: 1996 harley dyna-engine vibration

I have been on 20 or 30 and they all did some worse than others. Good Luck Sorry i couldn't help.

Posted on Mar 03, 2010

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Im getting vibration in my 2007 FXDWG. I inspected the motor mounts & adjusted my clutch. The clutch was out of adjustment, and performance was better, but vibration is back. Is this "clutch chatter?"


Hi, Rick and the usual suspects are:
1. Wheels and or tires worn or damaged.
2. Engine/transmission/vehicle not aligned properly.
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For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a wonderful day.
Excessive vibration on Dyna Wide Glide Harley Davidson Forums http://kt-trading.net/mcimport/mc/HD/HD.Service.Manual.Dyna.pdf
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Check the rear engine mounts. The "axle" that holds the rear swingarm also has the rubber motor mounts in it. These may be worn and need replacing. Also, the shocks may be shot. Due to their open design, oil can leak out of them and be washed away before you notice it. The results is a pair of shocks that are no good. Shocks are expensive. If you know some that will let you swap out a set long enough to try a different set of shocks, try that. Make sure the shocks are the same length. Other than the shocks and the swing arm mounts, there's nothing else there to cause this.

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I'd check the motor mounts. The front mount is easy to get to but the rear isn't quite so easy. I'd check the front mount and the top engine stabilzer.

I assume that you've owned this bike long enough to know how it should feel. The Dyna series has rubber engine mounts. They do a very good job of dampening engine vibration once the engine gets up in it's rpm range. When the engine is idling, the vibrations can be felt then. When accelerating, you can feel some vibration but it should be bad.

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My 2009 Dyna Super Glide Custom motorcycle has had an unusual amount of vibration overall when under way while accelerating or deaccelerating through 2nd, 3rd, and 4th gears. It seems to me to be either...


You can check for a loose or broken motor mount but you need to consider how the rubber mounts work. The mounts absorb high frequency vibrations. Low frequency vibrations will be felt throughout the machine.

On most Dyna's, the bike vibrates when idling. When accelerating though the gears (and decelerating back down) if the engine rpm's gets below about 2000 rpm's, you'll feel the vibration. Once above this level, the bike smooths out due to the change in frequency of the vibrations. I have owned a '94 FXDWG since new and this is my experience with the bike.

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