cyberacer is correct. You should be able to pull your throttle open farther than what the servo is pulling it. If the servo pulls it to the max then when the chassis flexes it is yanking on the servo and you are sure to toast it. My servo it at full throttle and you can see how much more I can pull it open.

I have had problem at times with throttle servos going bad, Hitec 7955, after sending it back to Hitec, the service tech I spoke with, ask if it was used on a Losi RC car, I told him it was, he told me to set the servo horn on the with one tooth out from normal, stating that Losi has such a short pull, it creates a lot of heat with the short throw, throttleing and braking, so setting it up one tooth facing out, rather than have the horn in line, or straight as the servo is, longer throw does not put as
much stress and heat into servo motors. Since I have been doing that, no problems. Try it and see if it works for you.

Dave come over and get me early on the finals day and I'll take a look at it. After I dialed mine in it went for 18 months without issues.

It's smooth Frank

Same angles that I've always had it set up at. I just turned the carb a little closer to the center diff mount, but there isn't much difference in angle. I'll have to get back to you about the heat.

I have additional pull as you show. We even gave it a bit more last night just to be safe and still had servo failure.

I'll try it, but please clarify. Do you mean that the throttle side of the the servo horn should be 1 tooth closer to the motor or 1 tooth farther away from the motor at neutral position?

If you did that then it is something with the angles. I can take a peek at it next weekend if you like.....

I'm out of servos to test anything. I have one left in my steering. What to do. what to do. Buy another servo I guess.

I'm going to try to figure it out before then, but if I don't, I'll come over. Tx

Is that you, Cary?

+1 on the heat. I had a trinity motor a while back that when the motor came to temp it became really notchy and was creating havoc with servos. Not really sure why but my nova's dont have that issue.

I can only point out the usuals - grind down center diff housing to straighten carb angle, grind down chassis guard to clear the servo, make sure the servo is off the chassis, use the rubber grommets, and make sure there is no flex in the servo tray on either way of operation.

Since then I haven't had any problems in both buggy and truggy using 7955 and even a 985 for almost a year.

DO NOT USE A 7940 for your throttle/brake. The geartrain is too fragile. That is what your failure was, not the setup.

If you want that speed, use the 7954. Trust me, I tried it.

I'm not Cary, it's Marc.

! tooth farther away from the engine, as though you are on throttle.

+1 on the 7940, the 7954 is 20 bucks cheaper also, same as the 7955, difference is 7955 has titanium gears, 7954 has steel gears. Both have the same specs, torque and speed.