The stock A-arm ball joint replacement thread - Suzuki LT-R450 Forum :: LTR450HQ.com
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post #1 of 58 (permalink) Old 01-20-2009, 07:17 AM Thread Starter
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Here is a little write up on replacing the stock ball joints.
Everyone has been talking about it and I need to replace my uppers so I did it and plan to do the lowers next week.


Stock setup before replacement

[attachment=22593:IMG_0027.jpg]
[attachment=22594:IMG_0029.jpg]

First thing after the spindle disassembly cut the old ball joint off in front of the weld(leaving the weld on the a-arm) Use a cut off wheel on a grinder or zawsaw.
I used a 5" cut off wheel on a grinder them smoothed it with a flapper wheel
[attachment=22595:download2.JPG]
[attachment=22596:IMG_0072.jpg]
[attachment=22597:IMG_0074.jpg]

After you cut the ball joint and smooth it flat you will need to drill it to the correct size for tapping. I used a 14mm x 1.5 ball joint main thread so I need to drill it with a 12.5 drill or a 31/64" if you dont have the 12.5.
Then the hard part.
Tapping it all of the way through.
I tapped the hole all of the way through with the 14mm x 1.5 tap backing it out and cleaning and oiling it regularly.
You should drill and tap these and not just drill it over sized as a slip because you cannot get a good base on the back side of the old ball joint to jam the nut.
[attachment=22598:IMG_0090.jpg]

After tapping and installing with antiseize
[attachment=22599:IMG_0091.jpg]
Another view
[attachment=22601:IMG_0092.jpg]
[attachment=22602:IMG_0093.jpg]
[attachment=22603:IMG_0094.jpg]

To do the bottom you will follow the same instructions

Tools Needed
4.5' or 5" grinder with a cut off wheel and flapper sander disk or a zawsaw
Drill
12.5 or 31/64" Drill bit or reamer
14mm x 1.5 tap right hand thread
Cutting oil
Anti seize
Ball joints


If you want a beefy upgrade( what I did) you can get 68 and up VW Bettle tie rod end V.W. PN 131-415-812C.
They are 14mm x 1.5 main thread and a 12mm ball joint. You will have to ream you spindles to the next size up.



O'Reiley's sell these for about $27.64 each but some times doesnt have them in stock
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post #2 of 58 (permalink) Old 01-20-2009, 07:23 AM
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post #3 of 58 (permalink) Old 01-20-2009, 07:33 AM
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post #4 of 58 (permalink) Old 01-20-2009, 12:40 PM
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so you are going to use the same ball joint type for the bottom as you did for the top, will that be strong enough?
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post #5 of 58 (permalink) Old 01-20-2009, 01:01 PM Thread Starter
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Yes, I dont see why it wouldnt be. They are oversized compared to stock.

Take a look at the ball joint size on the upper compared to the stock one on bottom.
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post #6 of 58 (permalink) Old 01-21-2009, 08:49 AM
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yes i see, but i was talking about the shaft that goes into the a arm, im sure with a hard landing that small shaft would bend or even brake off.
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post #7 of 58 (permalink) Old 01-21-2009, 08:51 AM Thread Starter
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<div class='quotetop'>QUOTE (suzuki127 @ Jan 21 2009, 10:49 AM) <{POST_SNAPBACK}></div>
Quote:
yes i see, but i was talking about the shaft that goes into the a arm, im sure with a hard landing that small shaft would bend or even brake off.[/b]
It is the same size as any aftermarket ball joint sold in aftermarket a-arms. I really dont think it will break or bend

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post #8 of 58 (permalink) Old 01-21-2009, 09:08 AM
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i have been checking around and all of the aftermarket a arms use 16mm on the bottom and 14mm on the top, the bottom ball joint has to be stronger that the top you would think.
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post #9 of 58 (permalink) Old 01-21-2009, 09:15 AM Thread Starter
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Correct, The upper has little stress basicly hold the tire upright and in place. The lower holds most of the load. 16mm is an heavt duty upgrade that almost any a-arm manufactures offer. 14mm is plenty big unless your jumping huge 100 foot doubles or plan on dropping your bike off a building. you will never break/bend a 14mm ball joint under normal use.
If you were to have a wreck or something that mabee but, in that case I would rather have it break or bend because then it would take up some of the force instead of something else bending or breaking like a-arms or a frame

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post #10 of 58 (permalink) Old 01-21-2009, 09:18 AM
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well i jump 100 ft doubles and have hard landing all the time, so it would be better to get the 16mm lower and 14 mm upper right....
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