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Yokomo MR-4 TC Thread

Yokomo MR-4 TC Thread

Old 01-16-2015, 11:03 PM
  #2836  
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I just bought a MR4TC Special. I plan to run VTA with it..

How much trouble have I just gotten myself into?

Any newer cars I can get parts from?
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Old 01-17-2015, 01:01 AM
  #2837  
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Welcome to the family!
I run the MR-4TC Special and its great. If you need parts, ebay is your friend!

Cheers
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Old 01-17-2015, 01:19 PM
  #2838  
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Thanks.. It has the one way diff in the front..
I've heard it beaks easy.. should I swap it for the regular diff?
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Old 01-17-2015, 01:26 PM
  #2839  
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Unless you are running big motors (4.5t - 6.5t) or hit things a lot it will be fine. I superglued the outdrives into one of mine which made a very effective spool.

For the best durability of the diffs you will want the steel outdrives.

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Old 01-21-2015, 09:18 PM
  #2840  
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Well it showed up today.. I need to put new plugs on it before I can try it out.

Question..
It has a one way front diff
left front wheel acts as I would expect..
right front freewheels both directions..

I assume my right side of the one way is stuck or broken?
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Old 01-21-2015, 10:58 PM
  #2841  
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Yes the one-way bearing is most likely broken. If you remove both the outdrives, clean out any grease and then glue them in with quality instant glue you will have an effective spool.

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Old 01-21-2015, 11:38 PM
  #2842  
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I hated performing surgery on my new ride but the operation was a success.


The right side of the one way was gummed up..
After cleaning with alcohol and a little oil both sides are working great.

rear outdrives are plastic.
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Old 01-21-2015, 11:45 PM
  #2843  
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Thats good news re the one-way
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Old 01-22-2015, 09:27 AM
  #2844  
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So wish i could find metal front and rear outdrives....
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Old 01-22-2015, 11:39 AM
  #2845  
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Try Apex Models in the UK. They ship world wide. I bought a couple of sets of steel rear outdrives late last year and they said they had plenty.

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Old 01-25-2015, 11:46 AM
  #2846  
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Originally Posted by Wazza22
Yes the one-way bearing is most likely broken. If you remove both the outdrives, clean out any grease and then glue them in with quality instant glue you will have an effective spool.

Cheers
Yup.. the one way lasted 1 trip to the track and went out again.
When I cleaned it out again it lost about 4 roller bearings..

It's now a spool. the glue trick works great..

The old LRP brushed esc didn't have reverse.. that was kind of annoying so I put a Novak GTB in with a LRP X12 17.5 motor.. It's still geared for the brushed setup so I need to work on that.


We also found that the steering was binding..
Closer inspection revealed that the from A arms had been installed upside down swapped left to right.

I tore the whole front end apart and got it all together the right way and dialed in.

Driving much better now.
Attached Thumbnails Yokomo MR-4 TC Thread-8i2478a-800x450-.jpg  
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Old 01-25-2015, 12:31 PM
  #2847  
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That looks great, yes the spool trick is very useful. Heres a photo of mine.

Cheers
Attached Thumbnails Yokomo MR-4 TC Thread-img_0854.jpg  
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Old 01-25-2015, 06:22 PM
  #2848  
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Nice.. Like the carbon..

Do the sway bars help?

Any recommendations on pinion and spur to get a FDR of 4.0?
I can do the math but I'm not sure what will fit and mesh right.

66 spur 36 pinion in 48p would do the job.. 1.83 ratio x 2.2 for the drive train gets 4.03

Last edited by sschering; 01-25-2015 at 11:24 PM.
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Old 01-26-2015, 11:49 AM
  #2849  
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Hi there,

Yes that combo should be ok. Our track is huge and I had a 60T with a 39T to give 3.38 FDR. You can fit quite large pinions (up to 43T I have managed to get in), so a 66 spur should be ok.

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Old 01-26-2015, 03:09 PM
  #2850  
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Well they didn't have what I wanted in 48p spurs but I did go home with a 96t 64p spur and 53t pinion. Good for 3.98 FDR if it fits.
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