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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

-------------------------------
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 11-05-2017, 07:34 PM   #14491
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Went back to 4 gear and cut off the waterfall after seeing so many do it. Our local track is low/medium bite. Really enjoyed it.
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Old 11-06-2017, 05:26 AM   #14492
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Finally got a chance to run the RTR 6.6 with my son this weekend. We run on a carpet track so the stock tires got changed to Schumacher mini pins and staggered cut after the first pack. For a person with smaller hands like my 12yr old son the included TX is no good. The throw on the trigger is to long so he had to struggle a bit to get used to it. Shock package was very squishy so I put a set of 2x1.6 Pistons and 45f/40r shock oil, red springs on front and it changed the car immediately to the better. After a few more packs we kept going into thermal shutdown after a few minutes. The smallest pinion I could fit was a 20t and that helped get our run times up to about 8min. Still gets way hot after a run. Had to fiddle with the battery mounts a bit to get a shorty mounted transversely.

Overall I'm happy with the RTR. It didn't take a whole lot of messing around to get it setup for the carpet. Have lots of room for improvement but the car really reacts to any adjustments made to it. I'm not used to that. Sometimes on my other cars I'll make an adjustment and I can't tell the difference but this thing gives allot of feedback to setup changes.
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Old 11-09-2017, 12:52 PM   #14493
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Default Diff Rebuild

Does anyone make a diff rebuild kit or are we stuck buying the parts seperately?
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Old 11-10-2017, 07:32 AM   #14494
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Quote:
Originally Posted by AndyThomas View Post
Does anyone make a diff rebuild kit or are we stuck buying the parts seperately?
Not that I am aware of.

I usually purchase the following:
UM119 Diff Ring
BRG100 Diff.Thrust Bearing
UM120 3/32 Ball (14pcs)
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Old 11-10-2017, 11:06 AM   #14495
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This will save you a ton of money

https://m.ebay.com/itm/NEW-KYOSHO-ULTIMA-RB6-6-Diff-Balls-BRG100-97030-RB6-RT6-KB13/131883063580?hash=item1eb4d7d91c:g:UdAAAOSwtnpXjsP 7


https://m.ebay.com/itm/NEW-KYOSHO-ULTIMA-RB6-6-Diff-Rings-Hardware-SC6-RT6-RB6-KB18/132366164224?hash=item1ed1a36100:g:croAAOSw~l1Z5WA V




Quote:
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Does anyone make a diff rebuild kit or are we stuck buying the parts seperately?
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Old 11-10-2017, 06:07 PM   #14496
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B-fast makes great kits that are very high quality. I can't see their website now, but their kits are sold at various online retailers. I don't use the Kyosho-plates, go straight to these and eventually use the whole kit. Have for a few years now, they are super smooth and wear very well.
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Old 11-10-2017, 06:13 PM   #14497
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bfastrc.com, but the site is down now. Their facebook page is active, I am guessing the website/store is just temporarily down.
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Old 11-10-2017, 06:49 PM   #14498
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Do you guys sandbtge diff rings?
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Old 11-11-2017, 08:04 AM   #14499
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I don't sand the Kyosho rings. I look at the edges and you will see one side is rounded and the other is flat. I put the rounded edges towards the diff gear.

Once I have it built, I break it in on the bench for 5-10 minutes to get everything seated.
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Old 11-11-2017, 09:36 AM   #14500
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Thanks kraig!
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Old 11-14-2017, 01:11 PM   #14501
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Payment recieved
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Old 11-19-2017, 08:20 AM   #14502
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Anyone know if you can put a lay down diff in a RB6? Or would that require a 6.6 chassis plate due to extra holes....
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Old 11-19-2017, 09:57 AM   #14503
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Quote:
Originally Posted by watzonee View Post
Anyone know if you can put a lay down diff in a RB6? Or would that require a 6.6 chassis plate due to extra holes....
The transmission gears are the same between 6 and 6.6. To convert to the laydown config, you need a new transmission case, motor plate, and a few other things listed on the first page of this thread. You do not need a new diff. If using the 6 chassis, you will need to drill 2 holes in the chassis.
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Old 11-19-2017, 06:42 PM   #14504
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Thanks heyscottn that is what I wanted to hear... Thanks.....
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Old 11-28-2017, 08:38 AM   #14505
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Hey guys on a RB6 can you mount the rear shocks in front of the tower?? Do you need a different rear bulkhead to get the angles right??
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