This servo blows or at least the one I has does. I had it in my on-road (just replaced it with a Futaba 9451). The servo would work, then all the sudden decide not to work, it would almost always work when the engine was shut off, but when you fired up the engine it would work, then it wouldn't then it would, very dangerous stuff. This is just another long line of problems I have had with Hi-tech. I am not slamming them I guess I just have real bad luck. The car was never crashed or mistreated. Granted I don't know what was done to the servo as I got it used thing is I just have problem after problem with their servos. btw I tried it in multiple reicievers with the same problem it was the servo.