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Version 1

  • Original Version

Version 2

  • Master Unit has a software upgrade from Version 1 to Version 2.
  • Less twitchy around center for both steering and throttle.
  • 5% faster response and more of a linear feel.

Version 3

  • Master Unit uses Version 2 software.
  • Includes newer “Expert Grip Unit”.
  • Trigger stroke and movement is different
  • Grip pad has a different fulcrum point and is in-between the original grip pad size and the large grip pad size.
  • The KR-211FH is a two channel receiver, little slower CPU and regular copper antenna.
  • The KR-413FH is a four channel receiver, faster CPU and a coaxial antenna for better noise filtering and better range.
  • KR-211FH is not recommended for use in nitro vehicles or tracks that are very large.
  • If your module in your transmitter is designated for DSSS (red label) then you can only use DS receivers.
  • If your module in your transmitter is designated for FHSS (green label) or you have the EX-1 KIY FHSS system then you can only use FHSS receivers.
  • The different 2.4GHz systems can not be mixed to work together.

The KR-411FH and KR-413FH receivers differ by the CPU that is used in the receiver. The KR-413FH has a faster CPU to process the information resulting in a smoother and more linear feel.

  • When this receiver is used with a non-EX-1 KIY, speeds will not be noticed since the transmitter is the limiting factor.
  • When used with the EX-1 KIY FHSS system, response times can be as fast as 2.8ms in the Advanced mode.

If you live in North or South America, you can send in your items for service as long as they have been purchased in this region.
KO PROPO America is an independent company and only services customers within our region.

If you are outside of the America’s please contact your regional distributor for service.

Sometimes contacting us can solve a problem that you may encounter prior to sending in items.
If you still have problems or know that you need service, please fill out the service request form found here and send in your items.

General turn around time is about two weeks.
Cost of repairs will vary depending on items sent in and the parts needed for the repairs.

The Steering unit must be calibrated to the Master unit.
If you change Steering units or Master units you must perform the calibration every time.

To calibrate the Steering unit:
1. Turn on the transmitter and go to the System Menu (button 4 on the LCD screen).
2. Scroll to AdjustST and press the Enter key.
3. Move the steering wheel or stick all the way to the left, all the way to the right and back to neutral.
4. Make sure YES is highlighted on the screen and press and hold the Enter key until COMPLETE is shown on the screen.
5. You will be redirected back to the initial screen and the calibration is finished.

You can verify the movement of the steering by selecting the Monitor function (button 1 on the LCD screen).
Movement of the steering and throttle will be displayed with input.
If you have trim set in either the steering or throttle, the cursor will be off center due to the trim that has been added.

The Grip unit must be calibrated to the Master unit.
If you change Grip units or Master units you must perform the calibration every time.

To calibrate the Grip unit:
1. Turn on the transmitter and go to the System Menu (button 4 on the LCD screen).
2. Scroll to AdjustTH and press the Enter key.
3. Pull the trigger to full throttle, full brake and back to neutral.
4. Make sure YES is highlighted on the screen and press and hold the Enter key until COMPLETE is shown on the screen.
5. You will be redirected back to the initial screen and the calibration is finished.

You can verify the movement of the throttle by selecting the Monitor function (button 1 on the LCD screen).
Movement of the steering and throttle will be displayed with input.
If you have trim set in either the steering or throttle, the cursor will be off center due to the trim that has been added.

Sometimes the throttle pot can shift and go out of calibration or the trigger might be damaged.

Please perform the AdjustVR function to calibrate the steering and throttle pots. You must finish the function and do both (ST & TH) or the changes will not take effect.

If you cannot finish either the steering or throttle portion of the function, then the pot or something else can be damaged and you will need to send in your transmitter for service.

Sometimes the steering pot can shift and go out of calibration.

Please perform the AdjustVR function to calibrate the steering and throttle pots. You must finish the function and do both (ST & TH) or the changes will not take effect.

If you cannot finish either the steering or throttle portion of the function, then the pot is damaged and you will need to send in your transmitter for service.

The EX-10 Eurus uses the same casing as the EX-10 Helios and that is pretty much where the similarities end.

The Eurus has a new CPU processor that allows for speeds that are faster and incorporates the new DDS (Direct Digital System). The ease of navigation with the new menu system with 40 model memory and 3rd and 4th channel operations are now available. The slowest response in the Eurus is still a little faster then the fastest response in the Helios.

More info on the Eurus can be found here.

KO PROPO products are tested and inspected before they are packaged and shipped from Japan.
Warranty is 90 days from date of purchase to be free of manufacture’s defects.

Warranty items must be sent in for inspection and if deemed defective the item will be repaired or replaced at our discretion.

Please contact us before sending in an item for warranty as some issues can be resolved beforehand.

Version 1 was the initial system released in early 2012.

Version 2 was a software improvement in the Master Unit to be less aggressive around neutral settings and about 5% faster response and a more linear feel.

Version 3 incorporates the Version 2 Master Unit and the new Expert Grip Unit. The Expert Grip Unit has a new grip pad size and new trigger stroke.

1. Verify that the transmitter and receiver are paired and operating correctly.
2. With both the transmitter and receiver on, hold the throttle at the fail safe position desired.
3. While holding that position, hold down on the set button on the receiver until the LED goes off.
4. Then release the set button on the receiver and the LED will come back on.
5. Verify the fail-safe position by turning off the transmitter.

*Make sure to always turn on the transmitter first and then the receiver for correct operation. Make sure to always turn off the receiver first and then the transmitter.

1. Verify that both the transmitter and receiver are off.
2. Hold the set up button down on the module and turn on the transmitter.
3. Continue to hold down on the set up button on the module until the LED goes off, then release the set up button. The LED will come back on dim.
4. With the transmitter still on, go to the receiver.  Hold the set button down and turn on the power.
5. The LED will come on, release the set button and the LED will go off and then come back on.
6. Once the LED comes back on, turn off the receiver.
7. Turn off the transmitter.
8. Turn on the transmitter and wait for the LED on the module to come on and then turn on the receiver. Verify that everything is paired.

1. Verify that both the transmitter and receiver are off.
2. Turn on the EX-1 KIY.
3. Go to the System Menu (button 4 on the LCD screen).
4. Scroll to 2.4Gband and press the Enter key.
5. Make sure GENERAL is selected for the Operation and scroll down to START.
6. With the START highlighted, press and hold the Enter key until the screen display changes to show pairing.
7. With the EX-1 KIY still on, go to the receiver.  Hold the set button down and turn on the power.
8. The LED will come on, release the set button and the LED will go off and then come back on.
9. Once the LED comes back on, turn off the receiver.
10. Go back to the transmitter and hold the Enter key to exit the screen and you will be redirected to the initial screen.
11. Turn on the receiver and verify that everything is paired.

It depends on the system that you are using. Generally the faster transmitter systems will require the use of digital servos only. The EX-5 UR, EX-1 KIY and EX-10 Eurus FHSS system transmitter requires the use of digital servos. Please refer to the compatibility chart found here .

No, we recommend using the RF-901S or RF-903FH 2.4GHz module for your Tx. Please refer to the compatibility chart found here .