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Author Topic: Vibration From Rear-End At 70 MPH?  (Read 1903 times)

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Justin

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Vibration From Rear-End At 70 MPH?
« on: July 04, 2005, 10:11:30 PM »
Hello everyone,

A little while back, I mentioned the '75 CB400F I've been fixing up, and this past weekend, I finally had the opportunity to take it out to an extended spin!

The only issue I had at all on the trip was a vibration originating from the rear-end at 70mph+...looking down, the rear tire/wheel seemed to almost "hop" or vibrate up and down along the pavement at a high rate of speed...as if there were tons of little bumps on the highway...

What would cause this?
Anyway to fix it?

Thanks.

« Last Edit: July 04, 2005, 10:45:05 PM by Justin »
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Offline Tim.

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Re: Vibration From Rear-End At 70 MPH?
« Reply #1 on: July 04, 2005, 10:35:42 PM »
Did you have a burrito for lunch?
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Offline TwoTired

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Re: Vibration From Rear-End At 70 MPH?
« Reply #2 on: July 04, 2005, 11:43:32 PM »
Quote from: Justin on July 04, 2005, 10:11:30 PM
The only issue I had at all on the trip was a vibration originating from the rear-end at 70mph+...looking down, the rear tire/wheel seemed to almost "hop" or vibrate up and down along the pavement at a high rate of speed...as if there were tons of little bumps on the highway...

What would cause this?
Anyway to fix it?

Wheel/ tire balance,
worn shocks,
Tire not seated properly on rim,
or all the above.
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Ben

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Re: Vibration From Rear-End At 70 MPH?
« Reply #3 on: July 05, 2005, 02:57:55 PM »
Spokes out of adjustment?
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Offline mrbreeze

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Re: Vibration From Rear-End At 70 MPH?
« Reply #4 on: July 05, 2005, 10:43:27 PM »
Also be sure to check swing arm bushings.I just got my bike going...(well,almost!) and as soon as I get to hiway speed,I get a bit of wobble back there. I put it on centerstand and checked for play. There it was bigger than #$%*. The swingarm is loose at the shaft.I will be shopping for new bushings later this week.
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Offline Mark M

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Re: Vibration From Rear-End At 70 MPH?
« Reply #5 on: July 06, 2005, 02:43:20 AM »
A severe tight spot in the chain could also cause problems.
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