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Old 2019.02.12, 03:17 PM   #1
LJH
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Freeing up ball joints

Hello All,
I just installed the Kyosho MZW416 tube shock front end on my 90MM MR03 and it seems to have helped a bit as the car now holds the all time lap record on my mini-96 tracks. With that said I am still not happy with how free the balls are in the front arms. I went as far as using a very mild polishing compound and turning a kingpin in a drill in the hopes of loosening them up and while it got a bit better it is not terribly free.

How do you guys go about freeing up the ball joints on your Mini-Z's?

Cheers,
Jim
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Old 2019.02.12, 03:41 PM   #2
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I've done the same thing (drill mounted) with Mothers Metal polish and that did the trick for me.
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Old 2019.02.12, 03:47 PM   #3
LJH
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Quote:
Originally Posted by cowboysir View Post
I've done the same thing (drill mounted) with Mothers Metal polish and that did the trick for me.
Copy that, I may just have to get more aggressive with the compound. I used McGuire's Scratch-X which is very mild.

Thanks.

Cheers,
Jim

Last edited by LJH; 2019.02.12 at 03:52 PM.
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Old 2019.02.12, 06:04 PM   #4
herman
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I've read a tip somewhere... invert the kingpins...
Haven't actually tried it, but it might help...
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Old 2019.02.12, 08:06 PM   #5
LJH
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Quote:
Originally Posted by herman View Post
I've read a tip somewhere... invert the kingpins...
Haven't actually tried it, but it might help...
I have been running inverted kingpins pretty much fo day one.

Cheers,
Jim
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Old 2019.02.12, 08:15 PM   #6
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Mothers polish, and keep the duration of polishing relatively short. You want to minimize heat when polishing. Break it up into 5s spin and cool cycles, If you can reverse the direction the pin spins when polishing.

I find that if you get the plastic too warm, it will loosen up momentarily, but after cooling it is tight.
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Old 2019.02.13, 05:24 AM   #7
will3kgt
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Quote:
Originally Posted by LJH View Post
I have been running inverted kingpins pretty much fo day one.

Cheers,
Jim
Me too, never had a problem.
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