My shen doesn't like taking my BCG motor (with either the bit pinion OR the shen one) or my BCG gearsets...whats the deal? Should I try the 7 tooth pinion or what? The mesh is so tight when I put in my other gearsets that its hard to even turn by rolling the axle with my fingers.

Anyone else with shens please post about your gearing and if it was possible for you to change the setup. Thanks guys.