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Harley Riders USA Forums » Harley Davidson Motorcycle Models » Dyna Glide » Vibration problem fixed!


Dyna Glide Super Glide, Super Glide Sport, Super Glide Custom, Low Rider, Street Bob, Fat Bob and Wide Glide.



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Old 04-14-2012, 05:30 AM Top   #1 (permalink)
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Default Vibration problem fixed!

Havent put up a post in some time as the weather has been real nice and I eat, breath and sleep golf. Well fishing and riding the bob too. If you remember some time ago after I tore down the front end for powder coat and zombies I got this terrible vibration. I asked about the fall away test and heavy fork oil and was worried that I didnt put the bike back together right. I took everything down and back together and couldnt figure it out.. After research on the web I started looking at the front motor mount and some other vibration issues owners were having and stumbled on this..
Shimmed front motor mount today WOW - Harley Davidson Forums

I did this shim trick and vibration gone! I knew it couldnt have been the front end as the vibration was different thru rpm ranges and almost gone when I was at 65 in 6th gear.. This is when I started looking at the motor mounts... Here are some pics... Call me crazy but it worked...

see the gap when I removed the bolts?

Picture with shims..
A few more pics of the bob...I just need wheels, tires and new pegs and done for now..
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Old 04-14-2012, 07:18 AM Top   #2 (permalink)
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Cool,Ill keep this in mind.
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Old 04-14-2012, 06:32 PM Top   #3 (permalink)
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Depending on bad tires, loose steering leading to unsafe riding, all dynas vibrate until the get up to a certain mph. They have rubber mounts unlike soft tails.
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Old 04-15-2012, 12:22 PM Top   #4 (permalink)
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I might try that.. I put a midglide front end on my LR this winter with heavier fork oil and Ive got this terrible vib @ about 2-2400 rpm range. But, I also fixed a broken bracket that was holding my pipe in the cam cover area, I thought that bracket being fixed is what surely put that vib in there, I will check my rubber mounts.
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Old 04-15-2012, 04:44 PM Top   #5 (permalink)
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I had read about some of the motor mounts on these dynas (specifically the front motor mount) being bad, needing shimming , or trimmed down a bit. Good to know if the vibes go up that there is a simple fix.
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Old 04-16-2012, 06:05 PM Top   #6 (permalink)
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Nice bike man...looking good. I always forget about that trick...my mind always tells me..."the f'king front tire is out of balance"....thats what it feels like sometimes....but then you'll feel it in your feet....dynas got tha good vibrations.....
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Old 04-16-2012, 06:57 PM Top   #7 (permalink)
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Gonna do this..inexpensive and cant hurt
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Old 07-25-2012, 11:59 AM Top   #8 (permalink)
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The shimming helps a great deal, but Harley put out a service bulletin (M-1324) in May about the front isolator. The front mount is sagging causing the top curvature of the rubber mount to rub on the metal frame transferring vibrations. They are recommending trimming a little off the top of the rubber to gain a clearance of 0.020 - 0.040 in.
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Old 07-26-2012, 12:37 PM Top   #9 (permalink)
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I would love to see a picture of this to see how it is done. Great find by the way..
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Old 07-26-2012, 12:43 PM Top   #10 (permalink)
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The shim or the bulletin?
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Old 07-26-2012, 12:51 PM Top   #11 (permalink)
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I already posted pics of the shim at the start of the thread./ It helped with my vibration however if I can trim a little here and a little there maybe it will ride even smoother...

I was wondering if there are pics of a trimmed shim and how it was done...

Hell, I d like to see the bulletin as well..

Thanks
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Old 07-26-2012, 12:54 PM Top   #12 (permalink)
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I sent you a PM with my email address. I will send it to you.

I was being a smart a$$.

I can take pics of my mount trimmed and shimmed when I get home tonight.
Just have to figure out posting pics here.
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Old 07-26-2012, 01:07 PM Top   #13 (permalink)
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Didnt even notice!

Thanks for emailing the bulletin..
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Old 07-26-2012, 06:02 PM Top   #14 (permalink)
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Default Shim, Shaved Mount, Bulletin

As promised, I have attached pictures of my shim, shaved mount, and bulletin.

Shim: I used 1/4" brass flat stock. I believe the holes are 1.25" center to center.

Shaved mount: I went a little crazy with the shaving. I took most of the rounded area off with a razor knife and filed flat. You can cut it with the mount in, but it was much easier to remove the mount.

I have also included a copy of the HD bulletin pdf format.
Attached Images
   
Attached Images
File Type: pdf M1324 Dyna model vibration.pdf (249.6 KB, 821 views)
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Old 08-01-2012, 06:04 PM Top   #15 (permalink)
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After you shaved/Trimmed how did it effect the vibration?
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Old 08-01-2012, 11:10 PM Top   #16 (permalink)
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Quote:
Originally Posted by TylerIII View Post
After you shaved/Trimmed how did it effect the vibration?
Vibrations are practically gone. Took it from 0 to 160 mph on the freeway. Such an enjoyable ride. It has not felt like that since it was new.
There are some "harley" vibrations, but nothing like the dreaded dyna vibes.

Before you shave, look at the curved rubber at the top of the mount. It is most likely rubbing on the top metal frame. This is transferring vibrations from motor to frame.

Look at the pictures I posted in this thread. I went a "little" overboard, but some others have as well. You may just want to make the clearance like the bulletin, but I did not want to pull it out more than once. Lazy I guess.
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Old 08-02-2012, 04:31 AM Top   #17 (permalink)
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Great news and thanks for the update. Ill try this weekend.

0 to 160? Your crazy!!! HA
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Old 08-02-2012, 08:37 AM Top   #18 (permalink)
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Quote:
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Great news and thanks for the update. Ill try this weekend.

0 to 160? Your crazy!!! HA
Just a little!

I should not do conversions in my head! I will fix it when I get to a computer.

I was cresting just over 200 kmph which puts that between 125-130 mph.

It does not fix the fact that 6th gear is useless.
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Old 08-02-2012, 03:08 PM Top   #19 (permalink)
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Quote:
Originally Posted by Gommee View Post
Just a little!

I should not do conversions in my head! I will fix it when I get to a computer.

I was cresting just over 200 kmph which puts that between 125-130 mph.

It does not fix the fact that 6th gear is useless.
thanks for the information on the fix. I read the hd bulletin as well. dont know if youve ever ridden an evo model hd with a 5 speed above 80 mph or not but if you had you might change your mind about the 6th speed transmission. those old 5 speeds could vibrate your fillings out of your head at 80MPH +.
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Old 06-02-2013, 09:39 AM Top   #20 (permalink)
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Hey everyone sorry to revive an old thread but this is the first one that came up in the search. I have an 06 street bob that once warmed up a bit has a lot of vibes , but more importantly it has what I'd call a low rpm shudder... Like a flat spot when accelerating, and when decel. Just reving the bike, when it returns to idle and hits that "spot" there is an audible shake from the motor you can feel in the bars. If I ride it like I stole it, she's fine. Putting along low rpm, my feet start going numb from the vibes in the mid controls. Could all this be the front motor mount? The rubber is pretty oily and looks a bit ragged. Bought the bike last month, 5K on the clock. Thanks.
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Old 06-02-2013, 11:01 AM Top   #21 (permalink)
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Good info in here...Sounds like it may be running a little lean..Plugs?Dr. Dyno explains 02 sensors and closed-loop systems
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Old 06-05-2013, 08:05 AM Top   #22 (permalink)
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I ordered the dobeck tuner, hopefully that can fix the fueling. The previous owner had python pipes but I think the air filter is stock. Would running with the tune and pipes without upgrading the intake (only for a couple weeks) be a less than stellar idea?
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Old 06-05-2013, 10:46 AM Top   #23 (permalink)
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alexp883.......no you will be fine
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Old 05-05-2014, 01:33 PM Top   #24 (permalink)
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Shimmed yesterday and it solved some of the vibration. Doing the shaving of the Isolation rubber tonight to see if it helps more. My mount is touching the rubber so I would assume this is some of the problem.
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Old 05-05-2014, 02:17 PM Top   #25 (permalink)
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Since this was originally posted, There has been two different mounts designed and put on the market other than the OEM from Harley.
One is from Vibra-Technics and the other is from Glide-Pro.
Vibra-Technics is a totally revamped front mount.
Glide-Pro same design as OEM, but made with polyurethane.

Both are quite pricey, Vibra-Technics seems to have some great reviews and includes a built in stabilizer, Glide-Pro is new on the market and is not currently on their site.

I am still running my modified mount without any issues still. I may upgrade at some time, I want to make sure these new mounts prove themselves first.
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Old 05-06-2014, 06:33 PM Top   #26 (permalink)
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Shaving the rubber didn't help much. I'll have to check by bolt torques and the engine alignment.
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Old 05-15-2014, 05:50 AM Top   #27 (permalink)
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Engine alignment is good but I went to do a fall away adjustment and found the fall away to the right is 4" while to the left is 2". Took off the cap and loosened the fork bolts to move the tree up so that I could get to the star nut and adjust the fall away and noticed there was already a gap between the tree and the column tube. I wonder if the previous owner went to adjust this and left the tree elevated. Went to lower it and one of the fork tube bolts was so stripped I couldn't turn it so I am guessing this may be part of the problem.
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