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Kyosho Ultima RB6 & RB6.6 Car Thread

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Kyosho Ultima RB6 & RB6.6 Car Thread

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Old 12-21-2016, 08:46 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Kyosho Ultima RB6 & RB6.6 Car Thread
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Last edit by: tobamiester
RB6.6 Kyosho America Product Page: http://www.kyoshoamerica.com/ULTIMA-...T_p_24505.html

RB6.6 Manual http://www.kyosho.com/jpn/support/in...A_RB6_6_IM.pdf

RB6.6 Kyosho Youtube https://www.youtube.com/watch?v=vW_sR667utY

MSRP $639 MAP $399.99

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New RB6.6 parts (compared exploded views, prices and links are Kyosho America):

Chassis:
  1. Main chassis - UM731 - $125.99
  2. Side guards - UM732 - $9.99

Battery Holder:
  1. Battery plate - UM733 - $8.99
  2. Battery foam - UM741 - $7.99

Rear Bulkheads:
  1. MM3 and Laydown - UM740 - $9.99
    • MM3 bulkhead
    • Laydown bulkhead
    • Swaybar Holders

3 Gear Transmission (MM and RM):
  1. Transmission - UM734 - $10.99
    • transmission cases
    • spacers
    • caps
    • plastic FR & RR suspension hangers

  2. Gear Cover - UM735 - $6.99

Laydown Transmission (3 and 4 gear possible):
  1. Transmission - UM736 - $10.99
    • transmission cases
    • spacers
    • caps
    • required extra hardware
    • pastic FR suspension hanger

  2. 40T idler - UM737 - $6.99
  3. Motor plate - UM738 - $18.99
  4. Gear cover - UM739 - $6.99

Body:
  1. Blade body - UMB05 - $27.99

Optional Parts:
  1. Lightweigt Blade body - UMB05LW - $31.99
  2. Aluminum FR suspension hanger - UMW705B - $28.99 (may be able to file UMW705 to fit)
  3. Brass FR suspension hanger - UMW725B - $30.99 (looks more different than UMW725..someone confirm?)

Typical Upgrades for new RB6.6 Buyers

UMW701 Aluminum Steering Plate (RB6)
UMW702 Aluminum Crank Arm (RB6)
UMW704-0 V2 Aluminum Rear Hub Set(0/RB6)
UMW705B Aluminum Rear Sus. Holder (RF/RB6.6) or brass UMW725B
UMW707 Aluminum Rear Sus. Holder (RR-Mid)

Nice to have:

UMW723 Aluminum Front Sus Block (Type B/10g/RB6/RT6/SC6).


Aftermarket Parts:

Front Wing: https://www.prolineracing.com/perfor...mount-alum-rb6

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Old 01-08-2017, 12:45 PM
  #14086  
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It was the bottom on the same side, temp was very comfortable 68 deg. Just odd that it happened on the same side 3 times
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Old 01-08-2017, 01:28 PM
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What conditions would you put the shocks on front of the rear arms?
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Old 01-08-2017, 03:54 PM
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High grip--- turf.
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Old 01-08-2017, 10:12 PM
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Originally Posted by danwilson View Post
What conditions would you put the shocks on front of the rear arms?
Danwilson, my local track it pretty high grip dirt. Laydowns and shock on the front of arms are on all cars that have the capability. I built my 6.6 from the get go with the shocks on the front of the arms so I don't know what it feels like on the back side of the arms but we are doing this setup to help carry more corner speed.
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Old 01-08-2017, 10:20 PM
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Originally Posted by ruttrowreroy View Post
I have a RB6 stock shocks and 3 times in races today, I cracked my shock end in half. Could someone please tell me why this is happening. I had minimal camber and haven't had this issue in the past. Any suggestions would be deeply appreciated.
I have yet to have this issue. It sounds to me like your talking about the plastic eyelet piece at the end of the shaft. I can't imagine this happening on the front arm. I could see it happening on the rear arm however if you over tighten the screw that mounts the shock to the arm. I did notice once when I snugged mine down that the screw managed to get tight enough to suck my plastic washer into the aluminum eyelet ball.
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Old 01-09-2017, 04:47 AM
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Originally Posted by ruttrowreroy View Post
I have a RB6 stock shocks and 3 times in races today, I cracked my shock end in half. Could someone please tell me why this is happening. I had minimal camber and haven't had this issue in the past. Any suggestions would be deeply appreciated.
Can u post a pic
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Old 01-09-2017, 04:53 AM
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Is it possible u are turning the eyelet onto the shock shaft and tightening it to the point that the shock shaft is tearing the eyelet. The eyelets don't meet to be tightened in the shaft. They can actually be adjusted to change droop
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Old 01-09-2017, 09:02 AM
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How many on this thread run 4 gear laydown ??
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Old 01-09-2017, 10:55 AM
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Thanks for responding, I will keep an eye while tightening!
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Old 01-09-2017, 10:58 AM
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Originally Posted by eper View Post
Can u post a pic

I will try, but yes it is the eyelet that attaches to the bottom of the shock. It's breaking right above the eye.
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Old 01-09-2017, 11:04 AM
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Originally Posted by eper View Post
Is it possible u are turning the eyelet onto the shock shaft and tightening it to the point that the shock shaft is tearing the eyelet. The eyelets don't meet to be tightened in the shaft. They can actually be adjusted to change droop
Thx for the reply, I think I am tightening too tight and when I put it on the shaft, causing issues..I appreciate your help! I will make some adjustments and see.
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Old 01-09-2017, 12:49 PM
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Originally Posted by mbrown6 View Post
Danwilson, my local track it pretty high grip dirt. Laydowns and shock on the front of arms are on all cars that have the capability. I built my 6.6 from the get go with the shocks on the front of the arms so I don't know what it feels like on the back side of the arms but we are doing this setup to help carry more corner speed.
Is your track glued together dirt that you run treaded tires on?
The track I'm thinking about trying rear shocks on front of arms is wet clay that we run slicks on I wouldn't call it high grip maybe medium the majority of the time.
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Old 01-09-2017, 02:40 PM
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Originally Posted by Rcforlife13 View Post
How many on this thread run 4 gear laydown ??
We run 4 gear for mod and 3 gear for stock. That seems to be the norm as far as what I've seen. I've seen a couple people try 3 gear laydown in mod and say they didn't like it. The torque of the motor twists the car to the front in 3 gear and un-weights the rear. It's not as pronounced with a stock motor and less drag is beneficial with a stock motor.
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Old 01-10-2017, 03:03 AM
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Originally Posted by ruttrowreroy View Post
Thx for the reply, I think I am tightening too tight and when I put it on the shaft, causing issues..I appreciate your help! I will make some adjustments and see.
Usually we measure form the top edge of the eyelet to the bottom of the shock body to set droop. I believe when I ran that car I ran about 21mm of droop. Check a set up sheet to be sure. U can find setups on petit rc.com
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Old 01-10-2017, 10:54 AM
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Default Rb6.6 alum idler gear

Anyone's input on adding these for a laydown 4 gear tranny
Attached Thumbnails Kyosho Ultima RB6 & RB6.6 Car Thread-img_1739.jpg  
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