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Servos glitch once engine starts

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Old 12-03-2018, 09:37 PM
  #1  
seansco999
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Default Servos glitch once engine starts

Hey all,

On my 1/5th scale Redcat Rampage MT, I am having trouble with my servos glitching once the engine is tarted. When the engine is off booth steering and throttle servos are 100% normal. As soon as i fire up the engine they both start glitching (seems like it could be RF issues). I do have 2.4GHz radio frequency and am using spektrum receiver. Sometimes when I try and give the truck about half throttle, it will go straight to full throttle and get stuck there for a few seconds. I got this truck a couple months ago used, and previous driver indicated no such problems. I did put in the spektrum receiver, killer bee kill switch, and a new spark plug.

I have checked the servos, they are great and no issue there. I think there is some RF coming from either the spark plug, somewhere else on the engine, or possibly the killer bee kill switch?

I dont know what would cause the servos to jitter so bad, and what would also cause them to randomly go full throttle and stick. RF is my only thought.

I plan to install the old kill switch back, tighten down the spark plug, and potentially go with a different receiver if this all fail.

Please lend me some ideas, or if you have encountered a similar problems.

Thanks,

Sean
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Old 12-04-2018, 05:30 AM
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Check to make sure the plug cap is securely seated on the plug. If the plug cap is metal, it needs to be firmly locked into the spark plug.

Also, you did use a resistor spark plug, right?
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Old 12-04-2018, 07:51 AM
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seansco999
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Spark Plug is (Type H-CMR5), I dont know if this is resistor or not. (new to gas models, only have had nitro and brushless before) I will re-seed the spark plug tonight and and make sure the plug can is secure
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Old 12-04-2018, 08:46 AM
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If it’s a true NGK CMR5H (#7599), it should be a resistor plug. Check the plug cap and also check to ensure the receiver is as far away from the ignition as possible. Is the engine CDI equipped or magneto?
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Old 12-04-2018, 08:44 PM
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seansco999
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While troubleshooting I switched out my Hitech analog servo for a Savox digital one. All the noice is gone and everything seems to be working as normal
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Old 12-04-2018, 11:06 PM
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While not usually necessary, I’m still glad you found a solution.
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