U-Joint or Something else


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Psycheonabike
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U-Joint or Something else

Post by Psycheonabike » Thu Mar 14, 2019 5:54 am



Hi,

Sorry to bang on about this bumpy ride I have, but I have noticed a few things that might help diagnose properly!

Its DEFINITELY worse when in gear riding up a small hill - THAT is when its most obvious. Feels like the rear wheel is hexagonal!!! Its still there on the flat but nothing like as noticeable!

I have a replacement U-Joint that I could put in over the weekend as despite having had the shaft drive out last week and it and the U-Joint 'looked' ok i am wondering if it could be a warped or bent U-Joint given the riding up hill thing?

Also, do I need to remove the whole swing-arm to get the new U-Joint in or can I just drop the right side?

Or am I barking up the wrong tree???



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Rednaxs60
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Re: U-Joint or Something else

Post by Rednaxs60 » Thu Mar 14, 2019 9:54 am

Just drop the right side.
"When you write the story of your life, don't let anyone else hold the pen"

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Psycheonabike
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Re: U-Joint or Something else

Post by Psycheonabike » Fri Mar 15, 2019 6:04 am

So, what would you look at first re this bumpyness.

U-Joint (do they really bend?) I'd have thought they just go pop rather than weaken?

Or shocks?

Both PITA jobs so guess I have to choose!

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ekvh
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Re: U-Joint or Something else

Post by ekvh » Fri Mar 15, 2019 7:58 am

Pull the boot back and hold it with a bungee cord. You can view the ujoint from there. Rub a magnet inside the lower portion of the boot. If it yields metallic pieces it’s going . From your description, you would likely be able to see the wear marks on the yokes and it would be close to disintegrating.

Psycheonabike
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Re: U-Joint or Something else

Post by Psycheonabike » Fri Mar 15, 2019 8:41 am

...its not the U-Joint then.....

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Maz
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Re: U-Joint or Something else

Post by Maz » Mon Mar 18, 2019 4:20 am

Have you checked the final drive unit on the rear wheel?

Maz
Ironically, Common Sense is the LEAST common of all senses!

Psycheonabike
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Re: U-Joint or Something else

Post by Psycheonabike » Mon Mar 18, 2019 10:42 am

Maz wrote:
Mon Mar 18, 2019 4:20 am
Have you checked the final drive unit on the rear wheel?

Maz
I have...twice :lol:

All seems in order. Put back and Moly added. I am completely confused to be frank!!

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geraldm
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Re: U-Joint or Something else

Post by geraldm » Tue Mar 19, 2019 11:09 pm

You have done everything else have you checked to make sure your front yolk neck bearing is not loose.

Psycheonabike
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Re: U-Joint or Something else

Post by Psycheonabike » Wed Mar 20, 2019 5:38 am

Thanks but I am 99% sure its coming from the Drive Line somewhere...

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Maz
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Re: U-Joint or Something else

Post by Maz » Wed Mar 20, 2019 1:02 pm

Psycheonabike wrote:
Fri Mar 15, 2019 6:04 am
So, what would you look at first re this bumpyness.

U-Joint (do they really bend?) I'd have thought they just go pop rather than weaken?

Or shocks?

Both PITA jobs so guess I have to choose!
U joints don't bend, but they do get stiff. When you examined yours could you move it smoothly (without being loose) in both directions? Did you check that the actual drive shaft is perfectly straight?
I really can't think of anything else.
Maz
Ironically, Common Sense is the LEAST common of all senses!

Psycheonabike
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Re: U-Joint or Something else

Post by Psycheonabike » Wed Mar 20, 2019 3:32 pm

That's exactly what I did mate...felt good in all respects. Defo not Joint.

I'm at a loss too... :(



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