Vibration after engine mount change..help!
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Tourer
Joined: Feb 2008
Posts: 473
Likes: 0
From: The Peach State!
Vibration after engine mount change..help!
I just changed the front engine mount on my '06 Ultra. I've put over 40k miles on the bike so I know how it was before. After the change below 2000 rpms it vibrates way worse than before. Idle is about the same as before. The fairing brackets were broken and I repaired them. I went back with a 79-B mount which is what was taken out. I have spent hours moving the mount around trying to find a sweet spot but can't. Has anyone experienced this and found a fix? I just want my bike back like it was before. Please if anyone has a fix I would really appreciate it.
Outstanding HDF Member
Joined: Oct 2007
Posts: 3,450
Likes: 4
From: El Cajon Ca.
I have had the problem many times in the past and don't have an answer for you. I do know that it takes many miles before the new mount will start to settle down and soften up. I just live with it and after a while forget about it. It's about that time that the mount is ready for replacement.
Seasoned HDF Member
Joined: Aug 2010
Posts: 5,173
Likes: 177
From: East Coast
Just a guess here, so forgive me...would changing only ONE motor mount screw things up as the other rubber mounted areas are worn to a degree and one is brand new? Would this cause a sympathetic vibration?
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
Likes: 31
From: earth
You went from a worn motor mount, possibly the cast in metal sleeve was broken loose from the rubber, to a new firm mount. It should be expected that more vibration will be transfered to the chassis with a stiffer mount, and that is the typical result. Try the Glide-Pro or Sta-Bo motor mount, both of a similar design with a floating metal sleeve, kinda like a broken mount.
Tourer
Joined: Sep 2007
Posts: 251
Likes: 0
From: Concord, NC
I am experiencing the same vibration and I just installed a Glide Pro. I have a 2007 Street Glide and remember it not being this bad. The original mount was split and the sleeve had broken loose from the mount. Anytime I get around 2000 rpm's the mirrors vibrate beyond being able to see. I have also installed new brackets in the fairing that were broken. It can be very annoying but anything above 2000 rpm's and the mirrors smooth right out. Hate to think I will have to live with it but if so I will.
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Road Master
Joined: May 2008
Posts: 1,096
Likes: 107
From: Joplin, MO
One day while changing oil I noticed my front mount bolt on left side was missing. On closer inspection I saw no wear from bolt on the block, etc and realized that it had come from the factory missing a bolt. Went to HD, bought and installed both bolts and rubber bushings. Instantly noticed more vibration. I assume that since it had been loose on one side, the engine was free to move more and vibrate the frame less. JMO.
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Seasoned HDF Member
Joined: Nov 2010
Posts: 17,547
Likes: 7,153
From: Oxford, Nc
Just put the 79 B in mine last month and Man(!) the vibration shortened my trip that day. After a thousand miles it's settled down significantly.
By the way, 2000 rpm is one good way to break your crank, ( scissor.) The ISO system was never designed to smooth out the vibes at 2000 rpm. I ALWAYS keep them at 2200 and above. Mine turns 90,000 miles this week
By the way, 2000 rpm is one good way to break your crank, ( scissor.) The ISO system was never designed to smooth out the vibes at 2000 rpm. I ALWAYS keep them at 2200 and above. Mine turns 90,000 miles this week
