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Old July 13th, 2012, 17:31   #7
iKliiu
 
Join Date: Aug 2010
The stock spring is quite stiff, and the motor doesn't have that much torque, especially with a 8.4V mini. Try a 9.6V or a 7.4V LiPo and if that doesn't work, you should look at the gearbox.
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