Driveshaft U-Joint - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 11 (permalink) Old 02-24-2020, 07:09 PM Thread Starter
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Driveshaft U-Joint

I am servicing all of the bearings in the rear end of my 2008 with 103,500 miles on it and want to replace the u-joints. They are not loose, but just want to do a complete job. Took them to a local automotive drive-line repair shop and he said he could not get the actual u-joints.

Anyone here ever do this? Did you find a good source for the Koyo u-joint? Or did you go with an aftermarket set?

Part numbers? Places to look?

Thanks in advance!!
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post #2 of 11 (permalink) Old 02-24-2020, 07:37 PM
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Not serviceable AFAIK..... gotta buy the whole assembly which is mighty pricey as OEM. Best go ebay and find low milers... FJR u-joints aren't prone to failure, so a low miler (or two) if cheap enough will keep you going forever.
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post #3 of 11 (permalink) Old 02-24-2020, 07:50 PM Thread Starter
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All U-Joints are replaceable if I can source the correct size part. If I do I'll be sure to post it here.

A replacement U-Joint should run $30 or less and the cost to have a someone else install it should be no more than $50.... much better than the $220 for the replacement part
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post #4 of 11 (permalink) Old 02-24-2020, 07:52 PM
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Check www.partzilla.com for OEM parts... I've used them many times.
PN 5JW-46180-00-00,

Description: Cross Joint Comp.
$241.64


As Ray says, your best best is to find a low mileage unit on ebay....
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post #5 of 11 (permalink) Old 02-24-2020, 10:29 PM
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If it ainít broke, grease it and put it back.
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post #6 of 11 (permalink) Old 02-24-2020, 11:40 PM
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Driveshaft U-Joint

Quote:
Originally Posted by dannyg71083 View Post
All U-Joints are replaceable if I can source the correct size part. If I do I'll be sure to post it here. A replacement U-Joint should run $30 or less and the cost to have a someone else install it should be no more than $50.... much better than the $220 for the replacement part
Dannyg,

I agree. You will need the distance between the cap ends, and the cap diameter. With that, and made to handle 140 HP, everything else should follow. The U-joint makers should have on-line technical assistance for you. I would prefer a U-joint made with a grease fitting, if possible. I believe that MamaYama did not invent a special U-joint, but used something off-the-shelf.

The other FJR forums may have a good answer ready for you.

Otherwise, I agree with N4HHE; grease it and go.

Good hunting!
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Cheers,
Red
2008 FJR1300A
- Pirelli Angel GT (Spec A) tires, RDL seat, TPMS, GPS digital speedometer (Amazon ~US$28.00).
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post #7 of 11 (permalink) Old 02-25-2020, 08:02 AM
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A) I can't get just the bearings from the OEM;
2) I feel the need try to find something to fit;
C) I'm doing this work "just because" and with absolutely no indication of any defect.

That about sum it up? IMNSHO you're better off leaving it alone. In all these years, with normal routine clean-n-lube type maintenance, I don't remember a single instance of u-joint bearing failure. I'm thinking in a short couple of years we will. As the man said, "If it ainít broke, grease it and put it back."
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post #8 of 11 (permalink) Old 02-25-2020, 08:43 AM
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The FJR is a bike where the u-joint doesn't travel back and forth, so it doesn't get that stressed. The driveshaft is spring loaded at the rear diff and keeps the u-joint fully engaged with the middle gear and driveshaft at all times. I don't know of any failed ones.... other bikes, yes.
But maybe you're looking for a challenge of a new project, that's cool too. You'd still likely have to get a used one and tear it down to get measurements.

Ray
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post #9 of 11 (permalink) Old 02-25-2020, 09:09 AM
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I just clean and R&R it. If it has (or is) failed (failing), then I'd probably just buy new OEM. Which seems very rare to me because I've never heard of one failing of natural causes.

https://www.fjr-tips.org/maint/splin...upling101.html

https://www.fjr-tips.org/maint/spline/spline.html

https://www.fjr-tips.org/maint/sa/sa.html

https://www.fjr-tips.org/maint/ujoint/uj.html
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Last edited by bounce; 02-25-2020 at 09:12 AM.
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post #10 of 11 (permalink) Old 02-26-2020, 06:01 PM
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There's no shortage of them on eBay Motors.

https://www.ebay.com/sch/i.html?_fro...00+drive+shaft

Dave P.
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