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3racing Cero Ultra V1 & V2

Old 03-21-2023, 07:21 AM
  #346  
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Talk about fast shipping!! It just shipped from HongKong yesterday morning!!




Top deck is one piece


Springs are now yellow and white


Battery holders are not carbon fiber plates, but are spring loaded for hold downs


Built in fan attachment post

Last edited by speed90; 03-21-2023 at 07:49 AM.
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Old 03-21-2023, 06:54 PM
  #347  
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Originally Posted by jojji22
HELP!
How do you screw front upper wishbone to ball cap with M4x16 turnbuckle. As per the manual length has to be 11.1mm but the fit feels too tight, am afraid I will break it.

I had the same issue with mine. The turnbuckle fits much tighter in the upper arm than in the ball cup. I ended up running a 4mm tap through the upper arm, then screwing the turnbuckle into the ball cup until about 1 thread was still showing. Then turn this into the upper arm until the length is right. I probably should have just used a slightly larger drill bit (#28 ?) in the arm instead of a tap, since this made it slightly loose.

A couple other tips I learned (mostly by doing it wrong the first time):
The suspension has 2 different pivot ball sizes (4.8 & 5.2mm), put them in the wrong place and the suspension won't move right (or at all).
The M3 x 6 set screw in the lower side of the knuckles is too short. Should be 8mm long to insure enough threads in the knuckle.
Also, check the set screws in the rear drive shafts for tightness. One of the u-joint pins fell out and stopped the axle instantly. Unfortunately, the tire didn't stop instantly and it sheared the interlocking ears off of the wheel hex. (I thought this looed a bit fragile when I was assembling it. No failures since then, though.)
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Old 03-21-2023, 10:56 PM
  #348  
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Thank you Kevin,
I think all the ball ends should be threaded from factory.
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Old 03-22-2023, 03:32 PM
  #349  
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Just to clarify - I ran a tap through the upper wishbone, no issue with the ball pivots. Should have probably tried a few slightly larger drill sizes to find the right amount of tightness on the turnbuckle.
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Old 03-22-2023, 08:06 PM
  #350  
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Originally Posted by speed90
Talk about fast shipping!! It just shipped from HongKong yesterday morning!!




Top deck is one piece


Springs are now yellow and white


Battery holders are not carbon fiber plates, but are spring loaded for hold downs


Built in fan attachment post
Any part numbers for these changes? For instance the battery holders?

I gotta say, I don't know why anyone would want the single piece top deck though, it's so much easier to work on as 2 piece imo
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Old 03-23-2023, 03:48 AM
  #351  
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Originally Posted by amp3d
Any part numbers for these changes? For instance the battery holders?

I gotta say, I don't know why anyone would want the single piece top deck though, it's so much easier to work on as 2 piece imo
Track conditions. Top Xray driver at our track uses a one piece top deck.

Last edited by Isaac; 03-23-2023 at 04:16 PM.
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Old 03-23-2023, 09:37 AM
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Originally Posted by Kevin Marcy
Just to clarify - I ran a tap through the upper wishbone, no issue with the ball pivots. Should have probably tried a few slightly larger drill sizes to find the right amount of tightness on the turnbuckle.
Mine upper ball cups or wishbone were not threaded. I broke a cup :'l
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Old 03-23-2023, 10:10 AM
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Originally Posted by jojji22
Mine upper ball cups or wishbone were not threaded. I broke a cup :'l
with a little trimming the Schumacher MI7 ball cup fit perfect

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Old 03-23-2023, 12:25 PM
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Originally Posted by Isaac
Track conditions. Top Xray driver at our uses a one piece top deck.
I can add that the 5x5 isn't suitable on our new CRC carpet. Went back to 6x4 and mid motor. What I didn't try was motor forward on the 5x5 though.
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Old 03-23-2023, 12:27 PM
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Originally Posted by jojji22
Mine upper ball cups or wishbone were not threaded. I broke a cup :'l
When I built the Ultra back in October, the ball cups threaded easily. The arms required drilling and a tap.
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Old 03-23-2023, 03:57 PM
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Originally Posted by old_dude
When I built the Ultra back in October, the ball cups threaded easily. The arms required drilling and a tap.
Exactly.
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Old 03-23-2023, 05:19 PM
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Originally Posted by Kevin Marcy
Exactly.
I didn't even think it was hard when using the tool supplied in the kit to hold the ball cup.
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Old 03-23-2023, 07:19 PM
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Originally Posted by old_dude
When I built the Ultra back in October, the ball cups threaded easily. The arms required drilling and a tap.
I built 3 kits this week, and I just used some grease on the threads before screwing it into the arms. No issue if greased
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Old 03-24-2023, 05:08 AM
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Originally Posted by amp3d
I built 3 kits this week, and I just used some grease on the threads before screwing it into the arms. No issue if greased
Every arm (not the cup), had the hole too small for a 4mm thread to start with. I am a mechanical engineer and I measured the hole as it simply looked too small. I drilled it with the drill specified for a 4mm thread and then carefully tapped it. If you at least didn't drill it and the hole was the same size as the arms I have then your arm is very much overstressed. Mine are very easy to change camber on and hold their setting. And yes I still greased.
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Old 03-24-2023, 06:38 AM
  #360  
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I broke one because I screwed it too much, I didn't have the spare so I replaced it with a Mugen with Mugen sphere, it works perfectly
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