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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 ForumsThread 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 01-16-2019, 12:14 PM
  #14926  
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Do you guys/gals have any suggestions on a must have upgrade/change on the rb6.6 for 17.5 carpet racing? Something that you cant imagine running without it that makes a huge difference?
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Old 01-16-2019, 02:40 PM
  #14927  
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Originally Posted by rsxskyd
Do you guys/gals have any suggestions on a must have upgrade/change on the rb6.6 for 17.5 carpet racing? Something that you cant imagine running without it that makes a huge difference?
IŽd say the RB7 Front Gullwing Arms.
Allows you to run lower ride heights essential for carper racing.
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Old 01-17-2019, 05:34 AM
  #14928  
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Originally Posted by JCG1
IŽd say the RB7 Front Gullwing Arms.
Allows you to run lower ride heights essential for carper racing.
Awesome, that is one thing ive noticed some of the carpet guys are doing is using the rb7 arms.

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Old 02-09-2019, 10:59 PM
  #14929  
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I just got my RB6.6 out to check it over before my first meet next week and have found its really noisy when I come off the throttle and its coasting. It has a real rattle to it The car ran fine in November which was its last meet, and I just cleaned it and put it away for a couple of months. I have put a new motor in this year as the old one packed up and that was checked on a motor analyser when the timing was set and the motor seems fine.
Its running the ball diff, 3 gear standup, exotek slipper eliminator in 17.5T stock

I checked the spur/pinion mesh and adjusted it, it made it a tiny bit quieter but still really noisy
The spur doesn't look brand new anymore but is in good condition, it has sharp gears still
The pinion looks like new still
When I turn the wheels by hand the ball diff appears fine (they are a dark art to me but I get help with them from more experienced people at the track and this feels like it always has)

I took the pinion off and rolled the car and it didn't make the noise at all, also ran the motor without the pinion and that was fine. I'm picking that this means its either to do with the spur/pinion mesh, or its when the gearbox has a bit of load (ie resistance from the motor working against the rolling) which means the most likely would be the diff.

So it just makes the noise when I come off the throttle and the car is coasting. Is this normal for the RB6.6 or do I need to investigate further?
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Old 02-10-2019, 04:44 AM
  #14930  
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Originally Posted by jgil089
I just got my RB6.6 out to check it over before my first meet next week and have found its really noisy when I come off the throttle and its coasting. It has a real rattle to it The car ran fine in November which was its last meet, and I just cleaned it and put it away for a couple of months. I have put a new motor in this year as the old one packed up and that was checked on a motor analyser when the timing was set and the motor seems fine.
Its running the ball diff, 3 gear standup, exotek slipper eliminator in 17.5T stock

I checked the spur/pinion mesh and adjusted it, it made it a tiny bit quieter but still really noisy
The spur doesn't look brand new anymore but is in good condition, it has sharp gears still
The pinion looks like new still
When I turn the wheels by hand the ball diff appears fine (they are a dark art to me but I get help with them from more experienced people at the track and this feels like it always has)

I took the pinion off and rolled the car and it didn't make the noise at all, also ran the motor without the pinion and that was fine. I'm picking that this means its either to do with the spur/pinion mesh, or its when the gearbox has a bit of load (ie resistance from the motor working against the rolling) which means the most likely would be the diff.

So it just makes the noise when I come off the throttle and the car is coasting. Is this normal for the RB6.6 or do I need to investigate further?
You might need to open up the gear box and check the idler gear.
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Old 02-10-2019, 05:43 AM
  #14931  
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Originally Posted by jgil089
I just got my RB6.6 out to check it over before my first meet next week and have found its really noisy when I come off the throttle and its coasting. It has a real rattle to it The car ran fine in November which was its last meet, and I just cleaned it and put it away for a couple of months. I have put a new motor in this year as the old one packed up and that was checked on a motor analyser when the timing was set and the motor seems fine.
Its running the ball diff, 3 gear standup, exotek slipper eliminator in 17.5T stock

I checked the spur/pinion mesh and adjusted it, it made it a tiny bit quieter but still really noisy
The spur doesn't look brand new anymore but is in good condition, it has sharp gears still
The pinion looks like new still
When I turn the wheels by hand the ball diff appears fine (they are a dark art to me but I get help with them from more experienced people at the track and this feels like it always has)

I took the pinion off and rolled the car and it didn't make the noise at all, also ran the motor without the pinion and that was fine. I'm picking that this means its either to do with the spur/pinion mesh, or its when the gearbox has a bit of load (ie resistance from the motor working against the rolling) which means the most likely would be the diff.

So it just makes the noise when I come off the throttle and the car is coasting. Is this normal for the RB6.6 or do I need to investigate further?
Funny you mention this, I was just googling possible causes of my similar problem. I just too switched to a new motor and noticed a funny sound as well. First few runs it was fine, but halfway through the race night, it started making a "tinging" sound while coasting. I know I'm my case it's the motor. Even with a pinion on it and turning by hand it makes a noise. It almost is like the rotor is SUPER strong, causing a heavy magnetic cog. I tore the motor down and saw no issues though. Performance was not effected either.

What motor are you running?

It is a good idea to open the gear box and check though, the stand-up trans plastic idler gears have been known to strip. And while it's apart, check the motor by hand. What you're saying sounds exactly like what I'm dealing with as well.
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Old 02-10-2019, 10:03 AM
  #14932  
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Originally Posted by dmcguire
Funny you mention this, I was just googling possible causes of my similar problem. I just too switched to a new motor and noticed a funny sound as well. First few runs it was fine, but halfway through the race night, it started making a "tinging" sound while coasting. I know I'm my case it's the motor. Even with a pinion on it and turning by hand it makes a noise. It almost is like the rotor is SUPER strong, causing a heavy magnetic cog. I tore the motor down and saw no issues though. Performance was not effected either.

What motor are you running?

It is a good idea to open the gear box and check though, the stand-up trans plastic idler gears have been known to strip. And while it's apart, check the motor by hand. What you're saying sounds exactly like what I'm dealing with as well.
I had come to that conclusion as well. I was goingnto swap the old motor in to see if it made any difference. I took out a 2 year old, knackered, full of dirt trackstar V1 17.5T and replaced it with a Surpass V4S 17.5T. The Surpass has very strong magnets compared to the Trackstar.

I will check the idler gear too

Thanks everyone
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Old 02-15-2019, 03:48 PM
  #14933  
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will the 6.6 body work ok on an rb6 mm?
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Old 05-06-2019, 06:17 PM
  #14934  
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Hello, Im new to this site so forgive me if Im in the wrong section? I want to know is the Ultima RB-6.6 to old to build? I just bought a rolling chassis with lid and $200. dollars in parts and with Reedy motor ! I paid $125. for the hole thing. It looks very clean! But someone told me that its to old to build and I would not find parts?? I really like the car so did i wast money ?? Im not really sure if I have the 6 or 6.6? It says RB6 on the lid but has all aluminum bottom shocks and rear spoiler brackets and has 17.5T Reedy M3 motor. Any info would be a great help!

Mike
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Old 05-06-2019, 06:58 PM
  #14935  
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The RB6.6 has only just been superseded by the RB7 and parts are still readily available anywhere that sells Kyosho. I imagine theres a good few years yet before parts will be scarce and the car will be out of date.
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Old 05-06-2019, 07:07 PM
  #14936  
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Originally Posted by Goingfaster
Hello, Im new to this site so forgive me if Im in the wrong section? I want to know is the Ultima RB-6.6 to old to build? I just bought a rolling chassis with lid and $200. dollars in parts and with Reedy motor ! I paid $125. for the hole thing. It looks very clean! But someone told me that its to old to build and I would not find parts?? I really like the car so did i wast money ?? Im not really sure if I have the 6 or 6.6? It says RB6 on the lid but has all aluminum bottom shocks and rear spoiler brackets and has 17.5T Reedy M3 motor. Any info would be a great help!

Mike
Definitely lots of parts available, either for the RB6 or the RB6.6 as they share a similar platform. The best site I found for parts are Amain and Kyosho America but I'm sure there are others as well. You got a great deal and will enjoy tuning and driving the buggy.
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Old 05-06-2019, 07:23 PM
  #14937  
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Do you by any chance know How old my car is ? Its white and green with silver like flames, it says Ultima RB6. It has dark brownish or bronz like shocks , with 3 gear mind engine mount ?The bottom is aluminum also! Thanks for your help? The reedy motor looks very cool too ! It came with lots of new parts in unopened packages ..
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Old 05-06-2019, 09:34 PM
  #14938  
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Pics will tell us what you have, mainly the chassis. All of the suspension parts from the rb7 will fit your car regardless of which model you have. Still worth building, . Plenty parts around
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Old 05-06-2019, 09:45 PM
  #14939  
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The rb6 is around 6 years old, the 6.6 was even better because of the new chassis and LD gear box
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Old 05-07-2019, 07:40 AM
  #14940  
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Iv tried over and over to send some pics? It has the low profile gear box and all aluminum chassis and shock, shorty pack battery ...
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