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Old 12-21-2009, 07:06 AM   #1
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Default Need Help on problem with Tekin 21.5 and Epic Duo 2 21.5

I am having issues with my Tekin 21.5 motor and my Epic Duo 2 21.5 motor:


TEKIN
I have a Tekin Redline 21.5 motor that I have ran now for 3 race dates, and this past race date (yesterday) it failed.

It started to make what I would describe as a "whirring" sound, sort of like something is off balance in the motor, not spinning true. The motor would then slow down to a crawl and stop completely.

This motor till now has worked great, never gotten hot (120 degrees max) and has great RPM.


EPIC
The motor will only start up when in the vehicle the car is given a push start. as soon as it comes to a complete stop, the motor will not start. I have tried other motors with the same speed control and sensor wire, and they work fine. I have also tried the motor in question on another working speed control and working sensor wire and it works fine there too.


Thanks for any help.
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Old 12-21-2009, 07:14 AM   #2
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The Tekin possibly has the magnet come loose on the rotor from your description.
Open the motor and verify this, you could hold the motor shaft with a pliers and apply throttle briefly and see if it spins with out the shaft moving.

The EPIC sounds like the sensor board itself inside the motor is bad. Not sure if these sensor boards are available loose but you can check.
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Old 12-21-2009, 07:17 AM   #3
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thanks for the info!
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Old 12-21-2009, 07:36 AM   #4
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Try a different sensor lead with the Trinity one.
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Old 12-21-2009, 07:37 AM   #5
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if by sensor lead you mean the sensor wire I have done that for the Epic motor as well as the Tekin one too.
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Old 12-21-2009, 11:33 AM   #6
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Cain, please contact me here: [email protected]
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Old 12-21-2009, 12:01 PM   #7
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Thank you Randy, I'll shoot you that message over now.

I got a message back from Epic and they advised me that it could be the board as well. The board is the same as the Duo 1 and I did try another duo 1 board that I believe was functioning, still no go.
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Old 01-02-2010, 03:11 PM   #8
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The rotor in the Epic may be shimmed to far away from the sensors and they arent picking it up from a stand still. I had the same problem with a speed passion motor (same sensor board and rotors). I just had to remove a shim from under the rotor (moving it closer, but not touching the sensor board). Make sure there is still 0.7 - 1mm gap from the sensor before running, otherwise it might be to close.
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Old 01-03-2010, 08:09 AM   #9
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The previous owner of a motor I had to return just got it back (Epic Duo 2), and he said its working fine on his stuff. for me, it would not go without a push start. this is using it on two different but same brand (speed passion) speed controls that other motors worked fine on. I shot him a message to confirm what his running gear is.

Could settings being used on the speed controls be part of the issue at least for the Epic? My buddy ran the rest of the day fine with a ballistic 21.5 borrowed motor, so odd stuff.
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Old 01-03-2010, 08:35 AM   #10
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A friend had the same problem with a team powers motor
which was not compatible with the tekin so I would give him
a push start in the heats. He out qualifed me also

any sounds like sensor problem

Get a diferant sensor lead
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Old 01-03-2010, 09:09 AM   #11
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tried multiple sensor leads that worked on other motors, no issues there.

Oh well, I'll see what Tekin says about the motor I sent to them, Just wished the epic worked out as the guy sold it really cheap and it was just going to be my daughters motor.
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