2012 Superlow Excessive Vibration ?
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Road Captain
Joined: Dec 2005
Posts: 673
Likes: 30
From: Warrington England
2012 Superlow Excessive Vibration ?
We've recently bought a 2012 Superlow which runs really nice & smooth 'till it reaches about 60mph(in 5th gear)then gets a high frequency vibration,which is consistent up to 70mph,i don't know if it smooths out again,i don't go above the speed limit,does this seem normal ?,it seems excessive to me,but I've never had a sportster before,so looking for opinions or advice.
Thanks.
Thanks.
Road Warrior
Joined: Jul 2013
Posts: 1,649
Likes: 443
From: Indianapolis
Have you tried running in 4th gear from 60 to 70 MPH?
5th gear at 60 mph is about 2800 rpms, 70 is about 3300.
In 4th you would be at ~3300 at 60 and ~3800 at 70.
EU bikes are geared a little different, they have a slightly different final drive ratio, your rpm will a little lower.
If the vibration is similar in 4th, it may be tire pressure, wheel balance or alignment related.
If it is not the same in 4th, you might check your engine mounts to make sure they are all torqued to spec.
5th gear at 60 mph is about 2800 rpms, 70 is about 3300.
In 4th you would be at ~3300 at 60 and ~3800 at 70.
EU bikes are geared a little different, they have a slightly different final drive ratio, your rpm will a little lower.
If the vibration is similar in 4th, it may be tire pressure, wheel balance or alignment related.
If it is not the same in 4th, you might check your engine mounts to make sure they are all torqued to spec.
Seasoned HDF Member
Joined: Aug 2017
Posts: 7,533
Likes: 12,164
From: Indianapolis
Have you tried running in 4th gear from 60 to 70 MPH?
5th gear at 60 mph is about 2800 rpms, 70 is about 3300.
In 4th you would be at ~3300 at 60 and ~3800 at 70.
EU bikes are geared a little different, they have a slightly different final drive ratio, your rpm will a little lower.
If the vibration is similar in 4th, it may be tire pressure, wheel balance or alignment related.
If it is not the same in 4th, you might check your engine mounts to make sure they are all torqued to spec.
5th gear at 60 mph is about 2800 rpms, 70 is about 3300.
In 4th you would be at ~3300 at 60 and ~3800 at 70.
EU bikes are geared a little different, they have a slightly different final drive ratio, your rpm will a little lower.
If the vibration is similar in 4th, it may be tire pressure, wheel balance or alignment related.
If it is not the same in 4th, you might check your engine mounts to make sure they are all torqued to spec.
Road Warrior
Joined: Jul 2013
Posts: 1,649
Likes: 443
From: Indianapolis
The suggestion to try 4th gear was to try to determine if the vibration is engine / rpm related or speed (chassis) related.
In 5th he should be between 3000 at 60 and 3500 at 70 with INT 883 gearing.
4th would add about 4-500 rpms higher at each speed.
His international Sportster will have a final drive ratio in 5th in between the US 883 and a US 1200.
US 883 is ~4.07 to 1
International 883 ~3.80 to 1
US 1200 ~3.51 to 1
In 5th he should be between 3000 at 60 and 3500 at 70 with INT 883 gearing.
4th would add about 4-500 rpms higher at each speed.
His international Sportster will have a final drive ratio in 5th in between the US 883 and a US 1200.
US 883 is ~4.07 to 1
International 883 ~3.80 to 1
US 1200 ~3.51 to 1
Thread Starter
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Road Captain
Joined: Dec 2005
Posts: 673
Likes: 30
From: Warrington England
Have you tried running in 4th gear from 60 to 70 MPH?
5th gear at 60 mph is about 2800 rpms, 70 is about 3300.
In 4th you would be at ~3300 at 60 and ~3800 at 70.
EU bikes are geared a little different, they have a slightly different final drive ratio, your rpm will a little lower.
If the vibration is similar in 4th, it may be tire pressure, wheel balance or alignment related.
If it is not the same in 4th, you might check your engine mounts to make sure they are all torqued to spec.
5th gear at 60 mph is about 2800 rpms, 70 is about 3300.
In 4th you would be at ~3300 at 60 and ~3800 at 70.
EU bikes are geared a little different, they have a slightly different final drive ratio, your rpm will a little lower.
If the vibration is similar in 4th, it may be tire pressure, wheel balance or alignment related.
If it is not the same in 4th, you might check your engine mounts to make sure they are all torqued to spec.
.Thanks again for the help.
Last edited by Tnbrit; Sep 1, 2020 at 02:37 AM. Reason: text added
I suggest that you change the plugs and check your HT leads . In my admittedly limited experience , excessive vibration in a Sportster can be symptomatic of one cylinder not quite running as well as the other one . Worked for me .
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Road Captain
Joined: Dec 2005
Posts: 673
Likes: 30
From: Warrington England
Thanks for the replies & advice guys(apparently nowadays that covers us all,so a good word to use)
.
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