Dyna Vibration Problem
Novice
Joined: May 2011
Posts: 19
Likes: 0
From: canada
2011 dyna fat bob
I made a shim for the front mount because i didnt want to play around with washers, I made it a little longer than the mount so i could hold it while re installing the bolts and the true track. My issue was vibration going over 100 kph and at 130 it was like i needed a 7th gear, lower rpm to smooth it out. an unbalanced engine with poor mounting. Rubber mounts are designed to have positive pressure on them not negative and thats the reason for the shim.
The second thing i did was add a true track, These are truly the second and third missing links. After installing them i now get a slight vibration in the pegs at almost all speeds but its minor and is due to the fact that there is now a frame to engine contact via the true track. Good trade off imo
The result.......
I can do 170 k with very little vibration
the throttle actually feels more responsive
chirps when agressively gearing down (this due to less engine in frame movement)
no more flat tire feeling
no more frame twisting feel when cornering while hitting a bump and doesnt feel like i am starting to go into a high speed wobble.
Corners i wouldnt do more than 90 i am now doing at 120
Note; I removed my slip ons to facilitate the install of the rear true track, The instructions say you must install the clip on the rear mount, I didnt see one
I made a shim for the front mount because i didnt want to play around with washers, I made it a little longer than the mount so i could hold it while re installing the bolts and the true track. My issue was vibration going over 100 kph and at 130 it was like i needed a 7th gear, lower rpm to smooth it out. an unbalanced engine with poor mounting. Rubber mounts are designed to have positive pressure on them not negative and thats the reason for the shim.
The second thing i did was add a true track, These are truly the second and third missing links. After installing them i now get a slight vibration in the pegs at almost all speeds but its minor and is due to the fact that there is now a frame to engine contact via the true track. Good trade off imo
The result.......
I can do 170 k with very little vibration
the throttle actually feels more responsive
chirps when agressively gearing down (this due to less engine in frame movement)
no more flat tire feeling
no more frame twisting feel when cornering while hitting a bump and doesnt feel like i am starting to go into a high speed wobble.
Corners i wouldnt do more than 90 i am now doing at 120
Note; I removed my slip ons to facilitate the install of the rear true track, The instructions say you must install the clip on the rear mount, I didnt see one
2nd Gear
Joined: Jul 2015
Posts: 6
Likes: 0
From: NC
I have a 2010 Dyna Super Glide, just bought with 1800 miles on it. Bike looks great, everything looks right but it vibrates very bad. I'm coming off a 2005 Sporty XL1200 thinking the Dyna would be much smoother but it's much worse than my Sporty. I understand idle vibration but it vibrates all thru speeds and as another poster noted, that when letting off the throttle it rattles like going over speed ridges.
Hopefully this is not normal.
Advice?
Hopefully this is not normal.
Advice?
Extreme HDF Member
Joined: Feb 2015
Posts: 10,907
Likes: 8,758
From: Galt's Gulch - MI
Zombie thread, back from the dead 
I keed, I keed...
When you say 'rattle' under decel is it a shudder going through the bike? If it's a shudder I'd check your front isolator, it's not about mileage but time. My '13 sat on the dealer's floor for a year before I bought her and the front isolator was distorted and contacting the engine bracket transferring vibrations through the bike with 0.4 miles on it. I changed out the isolator, performed the engine/vehicle alignment and needed to shim my isolator to keep it from being under stress and distorting the rubber; my Wide Glide has been boringly smooth ever since
This is the monster front isolator/shimming thread: https://www.hdforums.com/forum/dyna-...today-wow.html
HD had a service bulletin on the Dyna vibration issue in May 2012, give it a read and inspect your front isolator to determine if it's collapsing:
Edited to add: I completely forgot I had this image, this is my front isolator on my WG right after the install and alignment, you can see how much was needed to shim it out to keep the mount from being placed under stress and failing again:
I keed, I keed...When you say 'rattle' under decel is it a shudder going through the bike? If it's a shudder I'd check your front isolator, it's not about mileage but time. My '13 sat on the dealer's floor for a year before I bought her and the front isolator was distorted and contacting the engine bracket transferring vibrations through the bike with 0.4 miles on it. I changed out the isolator, performed the engine/vehicle alignment and needed to shim my isolator to keep it from being under stress and distorting the rubber; my Wide Glide has been boringly smooth ever since
This is the monster front isolator/shimming thread: https://www.hdforums.com/forum/dyna-...today-wow.html
HD had a service bulletin on the Dyna vibration issue in May 2012, give it a read and inspect your front isolator to determine if it's collapsing:
Edited to add: I completely forgot I had this image, this is my front isolator on my WG right after the install and alignment, you can see how much was needed to shim it out to keep the mount from being placed under stress and failing again:
Last edited by TinCupChalice; Dec 14, 2015 at 06:59 PM.
2nd Gear
Joined: Jul 2015
Posts: 6
Likes: 0
From: NC
Yes it's a shudder, especially harsh when I let off the throttle. When I clutch it, it will smooth out until I engage the gear again. And it never really smooths out at higher rpm's, past idle.
Thanks for the reply and info.
Thanks for the reply and info.
Cruiser
Joined: Oct 2010
Posts: 231
Likes: 13
From: Ontario, Canada
My 2008 fxd shuttered horribly at certain rpms, I don't know how the previous owner didn't try to fix the issue but anyways I ended up using 3 washers and longer engine mount bolts to "fill the gap" and now it feels much better.
Road Warrior
Joined: Aug 2006
Posts: 1,779
Likes: 71
My 2003 FXWG had some minor vibration issues and the 2014 low rider I just picked up seems to as well. I been riding HD since 70's so I know normal and abnormal vibration. Im not thrilled with a bike that has 4500 miles and vibrates ie shudders way to much but its winter so time to check it out. I know there was a big recall of 2014 LR for motor mount issue You would think after all these years and issues they HD would fix it once for all.
Road Master
Joined: Dec 2009
Posts: 1,118
Likes: 5
From: Coweta, Oklahoma
Like they have said above check you're motor mounts. Mine vibrated too until after I changed the front mount now things are much smoother.
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Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
When I clearanced mine as in the service bulletin, my problem totally went away.
