New motor mount, removed shims = smooth
Thread Starter
|
Ultimate HDF Member
Joined: Dec 2008
Posts: 5,120
Likes: 17
From: Indiana
New motor mount, removed shims = smooth
I attempted to swap out my front motor mount because it looked like crap and thought it would cure my wobble to which I still can't find the source of. Well it didn't cure the wobble, but the vibs are practically gone and I think my bike is the smoothest I've ever felt it. I also removed the shims I had in there. As smooth as it is I can't imagine the shims making it better right now. I can read signs in the mirrors for at least an 1/8th mile and can tell the shapes for a while after that. Cruising @ 70+ mph I can't believe how much smoother it is. Also before the mirrors would be worthless from the mid RPM range up, but not anymore and that's with 16 inch apes. Usable mirrors and no more vibes. Here are some pics of how crappy the old mount looked.
Notice the difference in height. New is on the Right and Old on the left.
And the back side
Notice the difference in height. New is on the Right and Old on the left.
And the back side
Road Warrior
Joined: Jul 2008
Posts: 1,286
Likes: 5
From: Arizona
I shimmed mine when I installed the new mount. I did not want to shim an already stretched and sacked out mount. You said you had about 9900 miles on the old mount...are you hoping for better life out of this new mount or do plan to replace it in another 10K miles? If the mount was stretched to the cross member as you tightened the front mount bolts I would expect the same life as the old mount. You can really see how much the bottom air gap has opened up from the rubber stretching, as this happens the top air gap disappears and makes contact with the top mount bracket (bottomed out) causing the vibration. If you eliminate the forward stretch on installation, the downward stretch will likely take longer to happen. What fatigues and fails first...a relaxed rubberband or a stretched rubberband?
Tech23
Tech23
Tourer
Joined: Jul 2008
Posts: 267
Likes: 4
From: Western Australia
I just replaced mine also, at about the same miles. Didn't notice until I had my old one out but it was skewed sideways about half an inch, I hadn't shimmed it and had never had any vibration. I've put a new one on and now at low revs I've got vibration, Its getting less as I ride it.
What sort on wobble do you have Jaron? I had front end wobble at 120km/hr plus when I changed to wideglide trees, 21" front and lowered rear shocks a while back. A slight change in rake and trail will fixed it. You can check this if your rear shocks are at the lowest setting put them at the highest. If it works but you want the rear low then just lower the front forks, or slide them through the trees. Mine has changed now but it worked for me at the time, when I was sitting on it bottom of the frame was level with the ground.
What sort on wobble do you have Jaron? I had front end wobble at 120km/hr plus when I changed to wideglide trees, 21" front and lowered rear shocks a while back. A slight change in rake and trail will fixed it. You can check this if your rear shocks are at the lowest setting put them at the highest. If it works but you want the rear low then just lower the front forks, or slide them through the trees. Mine has changed now but it worked for me at the time, when I was sitting on it bottom of the frame was level with the ground.
Thread Starter
|
Ultimate HDF Member
Joined: Dec 2008
Posts: 5,120
Likes: 17
From: Indiana
I shimmed mine when I installed the new mount. I did not want to shim an already stretched and sacked out mount. You said you had about 9900 miles on the old mount...are you hoping for better life out of this new mount or do plan to replace it in another 10K miles? If the mount was stretched to the cross member as you tightened the front mount bolts I would expect the same life as the old mount. You can really see how much the bottom air gap has opened up from the rubber stretching, as this happens the top air gap disappears and makes contact with the top mount bracket (bottomed out) causing the vibration. If you eliminate the forward stretch on installation, the downward stretch will likely take longer to happen. What fatigues and fails first...a relaxed rubberband or a stretched rubberband?
Tech23
Tech23
I just replaced mine also, at about the same miles. Didn't notice until I had my old one out but it was skewed sideways about half an inch, I hadn't shimmed it and had never had any vibration. I've put a new one on and now at low revs I've got vibration, Its getting less as I ride it.
What sort on wobble do you have Jaron? I had front end wobble at 120km/hr plus when I changed to wideglide trees, 21" front and lowered rear shocks a while back. A slight change in rake and trail will fixed it. You can check this if your rear shocks are at the lowest setting put them at the highest. If it works but you want the rear low then just lower the front forks, or slide them through the trees. Mine has changed now but it worked for me at the time, when I was sitting on it bottom of the frame was level with the ground.
What sort on wobble do you have Jaron? I had front end wobble at 120km/hr plus when I changed to wideglide trees, 21" front and lowered rear shocks a while back. A slight change in rake and trail will fixed it. You can check this if your rear shocks are at the lowest setting put them at the highest. If it works but you want the rear low then just lower the front forks, or slide them through the trees. Mine has changed now but it worked for me at the time, when I was sitting on it bottom of the frame was level with the ground.
I just asked for the mount by my bike, I didn't pay attention to part numbers, but on the receipt is says 47583-90B. Hope this helps!!
Club Member
Joined: Feb 2008
Posts: 11,483
Likes: 39
From: Passaic County, NJ
Trending Topics
Jaron & Vic,
Just a thought: why only replace the front mount? Wouldn't it be beter to replace both front and rear?
Anxious to hear your opinions!
Just a thought: why only replace the front mount? Wouldn't it be beter to replace both front and rear?
Anxious to hear your opinions!
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Tourer
Joined: Oct 2010
Posts: 285
Likes: 2
From: san jose, ca
cure the wobble
try a set of Sputhe Motor Isolators.
installed a set on my Dyna over 100,000 miles ago, perfect at the dragstrip or Bonneville.
installed a set on my Dyna over 100,000 miles ago, perfect at the dragstrip or Bonneville.
I attempted to swap out my front motor mount because it looked like crap and thought it would cure my wobble to which I still can't find the source of. Well it didn't cure the wobble, but the vibs are practically gone and I think my bike is the smoothest I've ever felt it. I also removed the shims I had in there. As smooth as it is I can't imagine the shims making it better right now. I can read signs in the mirrors for at least an 1/8th mile and can tell the shapes for a while after that. Cruising @ 70+ mph I can't believe how much smoother it is. Also before the mirrors would be worthless from the mid RPM range up, but not anymore and that's with 16 inch apes. Usable mirrors and no more vibes. Here are some pics of how crappy the old mount looked.
Notice the difference in height. New is on the Right and Old on the left.
And the back side
Notice the difference in height. New is on the Right and Old on the left.
And the back side
Outstanding HDF Member
Joined: Nov 2009
Posts: 2,666
Likes: 133
From: TEXAS
i am considering doing this.it is time
mine are original and they have 45,000 miles I have noticed an increase in vibration on my pegs.
is it a pain to replace the rear mount and is it worth doing both at once
I also think i will look into the sputhe isolators if they are that much better.
If they are simply replacement isolators i assume they will work with my true track mounts.
mine are original and they have 45,000 miles I have noticed an increase in vibration on my pegs.
is it a pain to replace the rear mount and is it worth doing both at once
I also think i will look into the sputhe isolators if they are that much better.
If they are simply replacement isolators i assume they will work with my true track mounts.