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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 06-12-2013, 04:58 AM   #7216
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Quote:
Originally Posted by john watkins View Post
Does anyone have a pic of their flat rear arms installed on their car?
here ya go



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Old 06-12-2013, 06:38 AM   #7217
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Hello,

I am building an RB6 to try running mid motor. I currently race an AE B4.2FT.

I have a question concerning the slipper shaft. More specifically the side to side play it has. With the tranny closed up, the slipper shaft moves maybe 2+mm side to side. It is almost as if a shim or two, or a spacer is missing, but there isn't anything listed in the manual. Have I overlooked something or is this side to side play normal?

Thanks in advance for any replies.

Mark
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Old 06-12-2013, 06:44 AM   #7218
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Quote:
Originally Posted by mlinder View Post
Hello,

I am building an RB6 to try running mid motor. I currently race an AE B4.2FT.

I have a question concerning the slipper shaft. More specifically the side to side play it has. With the tranny closed up, the slipper shaft moves maybe 2+mm side to side. It is almost as if a shim or two, or a spacer is missing, but there isn't anything listed in the manual. Have I overlooked something or is this side to side play normal?

Thanks in advance for any replies.

Mark
As long as you have the brass collar installed it's fine (see step 34 in the manual) These things are not super tight specs, also don't over tighten the case screws.
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Old 06-12-2013, 07:12 AM   #7219
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Mike,

Thanks for replying. Yep, the brass sleeve is there. I ask only because the similarly designed B4.2 slipper assembly doesn't have much side to side play at all. I will run as is.

Thanks again.

Mark
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Old 06-12-2013, 07:17 AM   #7220
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Mine doesn't move 2mm.
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Old 06-12-2013, 07:49 AM   #7221
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Hmmm. Well, I will take it apart and look again. Not much to mess up on this tranny. I know I can shim is with a couple 5mm shims, but they shouldn't be necessary.

Thanks.

Mark
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Old 06-12-2013, 08:23 AM   #7222
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No shims are needed. There is something wrong with yours. There is very little play when it's built right. Are both bearings seated correctly on the top shaft? Is the plastic motor spacer mated to the transmission properly? The motor plate flush with the long screws just threaded to the edge of the motor plate?

Build the slipper assembly to the instructions making sure the slipper pads fit in the indents of the spur gear. Once it's all assembled again you should have no issues.

There would be play on the top shaft if there was no slipper assembly installed yet too.
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Old 06-12-2013, 08:42 AM   #7223
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Quote:
Originally Posted by mikeyscott View Post
I'm about to convert my RB6 to a Vega Mid. Suits UK tracks better
Is this the conversion your talking about?

http://www.teamxtreme.co.uk/store/ve...rsion?cPath=1&

Also, what didn't you like about the RB6's mid motor layout?
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Old 06-12-2013, 09:21 AM   #7224
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I ended up with 1 too many. Low use car...
Rb6 exotek - reedy sonic - rs pro - KO one10
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Old 06-12-2013, 01:46 PM   #7225
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Sorry for the list of questions, but...
I'm likely picking up one of these used without any upgrades to get back into 2WD Buggy. What have turned out to be the must have upgrades (both durability and performance)?

I saw the Avid heavy duty rear axle announcement, anybody have thoughts on those? Which line axle are they equiv to?

Wide vs narrow rear holders, do the narrow ones also help with on power rear traction AFTER the turn is completed? That's where I've typically wanted more traction when I ran my RB5 and tested a friend's car (I'm decent with my finger, but would like to be able to push harder once squared up).

I've skimmed enough to see a bunch of talk about changing arms, what is the net change this is causing vs stock arms, and what is the reason for it?

I generally will be running a medium bite indoor damp packed dirt track (where b4.2's have taken over, including for the original owner of the RB6)...but I just can't bring myself to join the AE herd.
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Old 06-12-2013, 04:19 PM   #7226
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Quote:
Originally Posted by justpoet View Post
Sorry for the list of questions, but...
I'm likely picking up one of these used without any upgrades to get back into 2WD Buggy. What have turned out to be the must have upgrades (both durability and performance)?
Read post #1

Quote:
Originally Posted by justpoet View Post
I saw the Avid heavy duty rear axle announcement, anybody have thoughts on those? Which line axle are they equiv to?
The main purposes of these are to extend the threaded area and thicken the shaft. Should fit 3rd party wheels that are shared with the B4.2 better.

Quote:
Originally Posted by justpoet View Post
Wide vs narrow rear holders, do the narrow ones also help with on power rear traction AFTER the turn is completed? That's where I've typically wanted more traction when I ran my RB5 and tested a friend's car (I'm decent with my finger, but would like to be able to push harder once squared up).
narrow hangers will raise your rollcentre, which should give you more lateral traction (and less forward traction)

Quote:
Originally Posted by justpoet View Post
I've skimmed enough to see a bunch of talk about changing arms, what is the net change this is causing vs stock arms, and what is the reason for it?
better for high traction tracks
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Last edited by silvalis; 06-12-2013 at 04:52 PM.
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Old 06-12-2013, 09:00 PM   #7227
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Quote:
Originally Posted by joecool View Post
No shims are needed. There is something wrong with yours. There is very little play when it's built right. Are both bearings seated correctly on the top shaft? Is the plastic motor spacer mated to the transmission properly? The motor plate flush with the long screws just threaded to the edge of the motor plate?

Build the slipper assembly to the instructions making sure the slipper pads fit in the indents of the spur gear. Once it's all assembled again you should have no issues.

There would be play on the top shaft if there was no slipper assembly installed yet too.
Joe,

You were correct. I didn't have the long screws tightened down enough. It is all good now.

Thanks for your suggestion.

Mark
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Old 06-12-2013, 09:12 PM   #7228
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Can the mid motor use saddle packs? I don't have any shorty, only saw shorty setups on petitrc
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Old 06-12-2013, 09:38 PM   #7229
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Can the mid motor use saddle packs? I don't have any shorty, only saw shorty setups on petitrc
Yes.

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Old 06-13-2013, 12:19 AM   #7230
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Originally Posted by RCBuddha View Post
Is this the conversion your talking about?

http://www.teamxtreme.co.uk/store/ve...rsion?cPath=1&

Also, what didn't you like about the RB6's mid motor layout?
Yes

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