My losi has done that to me a few times. If I crash or come down hard I would still have steering.

Trying to isolate it to see which part is causing it

Sir Thank you it worked out so well. This and a Diff change helped a million in my tekno EB48.2. Today at the raw track on middle loose track.

Diff are
4 front 4 center 750 rear.

Worked perfectly. Thank sir

Thanks sir changing to the 100 punch vs my 80 punch help so much sir Thank you

well ive tried the motor reciever servo not sure what to try now

Ok maybe someone knows what's going on with my copperhead sc system. This all worked perfectly about a month and a half ago so yesterday I decide to run a second class just for the fun of it. I power up the system and touch the steering and throttle just to see if it works and all is good...Set the truck down on pit lane walk to Driverstand and nothing. I got steering but no throttle. The red and green light are on, if I try to power the system down nothing happens but the orange light is on while pressing the button. I've tried re binding the radio and re calibrator the esc but it won't even let me do that.. Any suggestions? I've used the system for my 5 year old for one short novice race day and it sat ever since.

weyant, for the first issue I have no clue. You'll need to wait for someone else to respond if they have encountered it. For the second....that sounds very much like a disconnected or bad sensor wire. Hope that helps.

hmmm seems weird a few of us are having this no throttle but still have steering issue. Sucks, I have a viper esc in my losi and tekno and am about to put one in my kyosho

The usual culprit is the sensor cable.

I actually experienced this on my brand new VTX8 during the 5th race. I thought my soldering had come undone and killed the power but I realised that there was power and steering worked. Can't quite remember what I did but throttle came back and I continued the race. Didn't get my place back but it did not affect my overall result of the day. Had it happened in two races then it would have been a pain.

Anyhow, I did try reusing the old sensor cable so I will swap it for new and have a look at the settings via the PC interface.

well I did try one sensor wire but ill try another one I have that I know works and ill see if that does it

I use a new wire to make sure. I removed my first wire before I ran the car and it was flaky and was perfect when I replaced it with a brand new one.

This time I reused the wire and it seems to be flaky on a brand new ESC so I have just swapped it over for a new one. If it still does it, something else is up, but we'll see in two weeks.

It did happen to me in my losi though with a castle setup now thinking about it. After it happened with the viper in there I put a glitch buster cap but it did it again. However I switched out the battery and it didnt happen anymore throughout the night. So perhaps a bad lipo or something?

Typically if a part of the system fails the end result is that you still have power through the receiver - so the servo works, but the motor will not run. Some options to try:

With VTX (sensored systems)
- sensor wire
- different motor
- check calibration
- confirm all solder joints (actually re-flow the solder)
- make sure capacitor on esc are ok

With Copperhead
- check bullet connectors (loose or arching condition)
- check calibration
- different motor

If you have been running the system (or ran the system previous), did anything strange happen in previous runs? What type of temperature did you record after the runs (more than just it didn't "feel" hot)? How long did you run? All these things make a difference. If the system work, then suddenly it doesn't -- something happen, somewhere in the mix.

Its possible --- key word there = "hard crash".

If you are running and "crash hard" or "land hard" off of jump - there could be a large amp spike, dropping the battery below LVC. They system will reset. Meaning it will go through the start up sequence again, takes 5-10 seconds to do that. That is a battery issue, the battery (or a cell with in it) not able to hold adequate voltage through the spike. Even thought that spike is only a few milliseconds at most.

Ran the Copperhead w/5150KV at LCRC this past weekend!!! Was smooth, but miss my VTX8 - 4.5 Combo!!! Had fun!!!

Quick question? What viper 1/10 esc is capable of running a 6.5 or 7.5?