Below are some of the common problems we experienced with 8411's. As of this time I believe most of these problems have been addressed and may now be non existent. Like other manufacturers JR recognized short comings and addressed them as they were realized. Servos evolve from use, the end result is failure and upgrades. All manufacturers experience the same thing, time tells all.

I want to make it perfectly clear that I believe JR's-8411 are good servos and I am in no way bashing them. I'm simply sharing my/our real world experiences with these servos.

#1 Premature gear train wear and or excessive slop!

#2 Miss-matched centers and end-points. I have literally had 30-40 of these things on the bench in an attempt to cherry pick those which could be used together with ailerons, elevators and ganged rudders. Matchboxes and the like solved this dilemma.

Rumor has it that JR has decided that programmable high speed, high torque servos are a desirable features and are in the works! These will be JRs ultimate Digital servo and their weapon of choice for aerobatic airframes in the future.

#3 Pins which are used to hold the gears in place dislocated or breaking free of the plastic servo case top. This was subsequently remedied with retrofitted case tops.

#4 Motors failing.

#5 Amplifiers failing.

#6 Excessive current draw overheated wiring systems and melted/damaged connectors and wire insulation. This may have been caused by #4 or #5 above or not, as this occurred several times and the servos still worked but were replaced.

#7 Damage to the primary gear from the slightest impact or shock, required gear set replacement. I think they eventually changed the material used for this gear.

#8 Service or repairs on these things was killing me. Rarely were things covered. Gear sets never were, something about normal wear and tear.

#9 Warranty including gear set replacement was finally extended to 3 years. Most likely due to the competition.