Maintaining Micro Mini Motors

This is specific to a brand of coaxial 3 channel micro mini helicopters called "735 Set." I really, really, like flying these things, so much that I was wearing them out. These helis have three motors-- One works the tail rotor and two more drive the main contra-rotating rotors. After wearing out three of these helis, I realized that the front motor that drives the top main rotor was always burning out. These motors are tiny and tightly held into the plastic frame. The front one burns out because it's almost entirely enclosed by the helicopter's canopy. The other main motor is exposed to the prop down wash and gets good ventilation. You'll know the front motor is failing because you have to trim all the way to the left at first. Then, either the heli will spin and be un-trimmable, or the motor will completely die. It ain't easy to pull the front motor out, then solder the connections and install a new one, but it can be done. Replacements are available from XHeli.com for around $3.00. I got tired of replacing the front motors, so I came up with an another solution to the problem. I limit flights on these little helicopters to 5 minutes. They'll go for 8 or 9 minutes on a battery charge, but that front motor will burn out in a week. Since I started my 5 minute rule-- No burnouts! I really like these little helis because even though they tend to be fragile, they're "easy" to learn, maneuverable indoor flyers. If you want to fly them around family and friends, people don't tend to be so nervous about them buzzing overhead as they are with my E-Sky Lama V3, for instance. So, set your timer and keep your little 735 Set flying!