I had suspected your sensor wire above, note that it's missing!






your soldering is also questionable, I would re-solder your B wire on the motor, maybe visit your track and ask an experienced driver to show you how he solders his motor wires


1) use a chisel tip soldering iron - in a pinch I have used my dremel to grind a fine point tip into a chisel tip

2) use soldering paste on bare metal before adding solder

3) tin the wire with solder

4) tin the motor tab

5) sandwich the solder iron between wire and motor tab until both liquify then press wire into pool of liquid solder, remove iron and hold in place until solder cools to solid


*** VERY IMPORTANT****


go back and read all the manuals for your ESC, Radio and Motor... take your time learning all the features, it will save you lots of frustration at the track!