a12 is pretty different (but in a good way this far for 1/12 newbies) sorta hard to mess I up to much

I’m hoping you are correct , I’ll have mine out first time this week :)

The hardest parts have nothing to do with any car chassis --- like gluing front side walls

Why does my ck25 rear pod bind up after race day. this has happend three weeks in a row.

When I mean bind it wont pivot left to right freely.
I'm able to re set it but after race day its wacked.

Probably time ro change the rear pivot and ball.

sounds like the red locknuts are not tight enough. You could also try removing the plastic football, disassembling it, and rubbing it on some fine emory paper on a flat surface - to be sure that the mating surface where the football rests on the chassis is FLAT and also not slick. Additionally you could scuff up the graphite chassis slightly in the area where the football rests, just enough to make that area not slick and shiny. The idea is to make the football stay put when it’s adjusted and tightened up. Once again, those red locknuts for need to be really tight and not just snug.

The only red lock nut that should be tight is the one in the center. The two on the sides should not be tightened so the center pivot can float read your instructions or get them online they tell you how to set it up. Tightening up the side red lock nuts will bind up the rear end of the car.

https://cimg4.ibsrv.net/gimg/www.rct...4a2823b620.jpg
Should the holes for lock nuts be oval shaped or circle?

They are supposed to be slotted. So when you pivot the pod side to side the center pivot will swivel back and forth in the slots, that's why you can't tighten the side red lock nuts.

.

I ran this car a few years ago....I don't think the above description of how to deal with the pivot is correct.

https://www.teamcrc.com/crc/download...5-17_setup.pdf

Here's a link to the CK25 instructions....I got them online. Unless there's a newer version somewhere, I don't think you are supposed to run the car with the pivot ball lock nuts loose. Leaving them loose at first is just part of the assembly process...to ensure the 'football' ends up in the correct location before you tighten them.

My experience is that the pivot ball binds because it moved on the chassis.....typically from a crash. Any time you have a big crash, you should check the pivot...if it's bound, repeat the assembly procedure from the manual (loosen nuts....chassis on flat board....tighten nuts....etc).

Sps3172 is correct. CRC intends for the center pivot to be adjusted and the nuts to be tightened to hold the aligned position. But it is also true that hard impacts or tumbling crashes can knock the pivot out of position and bind up the pod. So it is also possible to intentionally leave the 2 locking nuts very slightly loose so that the center pivot can “self adjust”. If you tend to crash a lot, doing so isn’t a bad option considering that going thru the necessary steps to re-align the center pivot is admittedly a bit time consuming and a little fussy. But the kit instructions do say to tighten those 2 locking nuts.

I was incorrect, the instructions do say to eventually tighten the side lock nuts down. But as a tip from a more experienced racer I was told to leave them slightly loose so the football/center pivot can slightly rotate for what little extra play you get rid of it's not worth having the chance of the back end of the car binding up

I had a mount made to use the r6 pivot on my ck25, no more need to check it after every crash

The fix for the pivot moving during a crash is to put a little washer under the nuts that hold the two side screws in place, then another washer between the outer locknut and plastic pivot housing. If it's jam-nut all together, it won't move unless you bent the screw.

Can you share pic and or drawings?