Cool, always nice when its something simple watch to see if the vibes return. If they do pay attention to the tail boom. There is a seam that runs right down the middle. That will come apart and you can't tell by just looking at it. The frame and tail box hold the two halves together. One give a way is to watch the tail in flight and go from a low speed hover to idle up 2. If the tail twists than its a good indication that seem has split. This caused head shake for me. Every time I thought I fixed it, it would eventually return. Took me a while to find it.
I still love this helicopter I'm just giving up on the aftermarket motor. I think the motor mount twists in a crash shoving the pinion into the main gear. Add that up with the motor being harder to spin and I think it knocks teeth off the main gear on impact. If you look at how the stock system is setup the frame holds the upper half of the motor from rotating the motor mount. When we put these aftermarket motors in we cut that piece out to make room for the outrunner motor. I have a motor mount stiffener in mine but I don't think its enough to keep that motor mount from being twisted on an impact.
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there is noway you are using thr. hold in your crashes to do that to a gear
if you are then your gear mesh is way off
i have only striped one main gear and thats when the motor came loose
and i have crashed and broken main blades and not hurt a gear
I think it probably depends a lot on flying style. I throw this helicopter around. Most of my crashes are either inverted or sideways into the ground. So the main blades are the first thing to strike and the helicopter usually has some momentum behind it. I hit throttle hold that doesn't seem to prevent the problem. The HP08 isnt that much more power over stock so I switched back to the stock motor.