Yes.
- 2.4ghz Hobao radio system
.28 vs .21 is a cheap way to get more power into an RTR. Going with a larger displacement engine pretty much guarantees more low end torque than a comparable quality .21 engine. Lower fuel economy, less RPM's, but more power.
20 years ago, you could get a...
If it only does it when the engine is running, could be your receiver is dodgy or you have a loose connection somewhere that vibration is causing fits for. AM is pretty susceptible to interference and any rubbing of metal or whatever on the truck when running can cause it to freak out a bit...
Does it do it when the engine isn't running or only when the engine is running?
What are you using for receiver power? An AA holder or a NiMH receiver pack?
Have you tried moving the servo plug to the throttle slot and see if the twitching still occurs?